CN112050747B - Brillouin strength and frequency shift strain temperature coefficient automatic test system and method - Google Patents

Brillouin strength and frequency shift strain temperature coefficient automatic test system and method Download PDF

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Publication number
CN112050747B
CN112050747B CN202010860632.0A CN202010860632A CN112050747B CN 112050747 B CN112050747 B CN 112050747B CN 202010860632 A CN202010860632 A CN 202010860632A CN 112050747 B CN112050747 B CN 112050747B
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optical fiber
temperature
strain
brillouin
level
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CN112050747A (en
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李立功
袁明
乔山
闫继送
徐瑞
李鹏
张洋
黄红伟
郭洪龙
李述标
盛立文
李明达
闫宝东
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CLP Kesiyi Technology Co Ltd
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CLP Kesiyi Technology Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)

Abstract

The invention discloses a system and a method for automatically testing Brillouin strength and frequency shift strain temperature coefficients, and belongs to the technical field of photoelectric measurement and optical fiber sensing. The invention provides an automatic testing method of 1310nm and 1550nm dual-band Brillouin scattering intensity and frequency shift strain temperature coefficients, designs a portable and telescopic optical fiber strain temperature coefficient testing platform which can meet the requirements of different optical fiber strain action areas, realizes the automatic testing of the Brillouin scattering intensity strain coefficient, the intensity temperature coefficient, the frequency shift strain coefficient and the frequency shift temperature coefficient of 1310nm and 1550nm two wavelengths, improves the testing efficiency of the optical fiber strain temperature coefficient, improves the coefficient analysis precision, provides technical support for an optical fiber strain distribution tester of intensity and frequency dual demodulation decoupling type of Brillouin scattering signals, and further improves the application range of the optical fiber strain distribution tester.

Description

Brillouin strength and frequency shift strain temperature coefficient automatic test system and method
Technical Field
The invention belongs to the technical field of photoelectric measurement and optical fiber sensing, and particularly relates to an automatic testing system and method for Brillouin intensity and frequency shift strain temperature coefficients.
Background
The Brillouin optical time domain reflectometer (BOTDR for short) calculates the strain distribution of the optical fiber according to the distribution information of the backward Brillouin scattering light of the measuring optical fiber. The Brillouin optical time domain reflectometer can be used in the fields of geotechnical engineering health monitoring, geological disaster early warning monitoring, cable and pipeline health monitoring and the like, and is one of the most powerful products for replacing traditional point sensors in the engineering field. However, in the process of using the BOTDR, the strain distribution and the temperature distribution thereof are obtained by analyzing and demodulating the spontaneous brillouin scattering, and the accurate strain distribution or temperature distribution value can be obtained by depending on the fiber strain coefficient and the temperature coefficient in the analyzing process, the traditional strain coefficient (hereinafter referred to as frequency shift strain coefficient) and the temperature coefficient (hereinafter referred to as frequency shift temperature coefficient) are calculated by using the brillouin scattering frequency shift value, the prior art realizes the decoupling of the fiber strain distribution data and the temperature distribution data by using the dual demodulation of the intensity and the frequency of the brillouin scattering signal, the traditional frequency shift strain coefficient and the frequency shift temperature coefficient obtained by the brillouin scattering spectrum frequency shift analysis hardly meet the analysis requirements of the test, and the method also needs the intensity strain coefficient and the intensity temperature coefficient obtained by the brillouin scattering signal intensity analysis, also, there are new methods that require an intensity strain coefficient and an intensity temperature coefficient of 1310 nm.
At present, the manual testing scheme of the artificial construction experiment is adopted for the testing scheme of the strength strain coefficient and the strength temperature coefficient, the strain coefficient testing process is at indoor normal temperature, the indoor temperature is difficult to keep constant, certain influence is caused on the testing of the temperature coefficient, the testing efficiency is low, the popularization is difficult, meanwhile, the testing can not be carried out in the field environments such as engineering sites, and the application and popularization of the optical fiber strain distribution technology are restricted.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the automatic testing system and method for the Brillouin strength and the frequency shift strain temperature coefficient, which are reasonable in design, overcome the defects of the prior art and have good effects.
In order to achieve the purpose, the invention adopts the following technical scheme:
an automatic testing system for Brillouin intensity and frequency shift strain temperature coefficients comprises a computer system (1), a first pulse modulation control module (2), a 1310nm laser (3), a first 9:1 coupler (4), a 1310nm pulse modulation module (5), a 1310nm Raman amplifier (6), a 1310nm optical circulator (7), a 1310nm polarization scrambler (8), a first O/E module (9), a first mixer (10), a first local oscillator module (11), a first 1:1 coupler (12), a first filter (13), a first high-speed acquisition module (14), a second high-speed acquisition module (15), a second O/E module (16), a first optical filter (17), a second 1:1 coupler (18), a second pulse modulation control module (19), a 1550nm laser (20), a second 9:1 coupler (21), The device comprises a 1550nm pulse modulation module (22), a 1550nm Raman amplifier (23), a 1550nm optical circulator (24), a 1550nm polarization scrambler (25), a third 1:1 coupler (26), a third O/E module (27), a second mixer (28), a second local oscillator module (29), a second filter (30), a third high-speed acquisition module (31), a fourth high-speed acquisition module (32), a fourth O/E module (33), a second optical filter (34), a fourth 1:1 coupler (35), a 1310nm/1550nm wavelength division multiplexer (36), a tested optical fiber (37) and an optical fiber strain temperature coefficient test platform (38);
the computer system (1) is respectively connected with the first pulse modulation control module (2), the 1310nm laser (3), the first local oscillator module (11), the first high-speed acquisition module (14), the second high-speed acquisition module (15), the second pulse modulation control module (19), the 1550nm laser (20), the second local oscillator module (29), the third high-speed acquisition module (31) and the fourth high-speed acquisition module (32) through circuits;
the pulse modulation control module (2) modulates the detection pulse by controlling the 1310nm pulse modulation module (5);
the first ends of the pulse modulation control module (2), the 1310nm pulse modulation module (5), the 1310nm Raman amplifier (6) and the 1310nm optical circulator (7) are sequentially connected through a line; the second end of the 1310nm optical circulator (7) is connected with the first 50% input end of the second 1:1 coupler (18) through a line; the third end of the 1310nm optical circulator (7) is connected with a 1310nm interface of a 1310nm/1550nm wavelength division multiplexer (36) through a line;
the 1310nm laser (3) and the first 9:1 coupler (4) are connected through a line;
the first 9:1 coupler (4) has 90% of output ends connected with the 1310nm pulse modulation module (5) and 10% of output ends connected with one end of the 1310nm polarization scrambler (8);
the other end of the 1310nm polarization scrambler (8) is connected with a first 50% input end of a first 1:1 coupler (12) through a line;
a first 50% output end of the first 1:1 coupler (12), a first O/E module (9), a first frequency mixer (10) and a first local oscillator module (11) are connected through a line; the second 50% input end of the first 1:1 coupler (12) is connected with the first 50% output end of the second 1:1 coupler (18) through a line;
the first mixer (10), the first filter (13) and the first high-speed acquisition module (14) are connected through a line;
the second high-speed acquisition module (15), the second O/E module (16), the first optical filter (17) and the second 50% output end of the second 1:1 coupler (18) are connected through a line;
the first ends of the second pulse modulation control module (19), the 1550nm pulse modulation module (22), the 1550nm Raman amplifier (23) and the 1550nm optical circulator (24) are sequentially connected through a circuit;
the second end of the 1550nm optical circulator (24) is connected with a 1550nm interface of the 1310nm/1550nm wavelength division multiplexer (36) through a line; the COM interface of the 1310nm/1550nm wavelength division multiplexer (36) is connected with a measured optical fiber (37);
the third end of the 1550nm optical circulator (24) is connected with the first 50% input end of the fourth 1:1 coupler (35) through a line;
the 1550nm laser (20) is connected with the first input end of the second 9:1 coupler (21) through a line;
a second 9:1 coupler (21), wherein 90% of the output end of the coupler is connected with the 1550nm pulse modulation module (22), and 10% of the output end of the coupler is connected with one end of the 1550nm polarization scrambler (25) through a line;
the other end of the 1550nm polarization scrambler (25) is connected with the first 50% input end of the third 1:1 coupler (26) through a circuit;
the first 50% output end of the third 1:1 coupler (26), the third O/E module (27), the second mixer (28) and the second local oscillator module (29) are connected through lines;
the second 50% input end of the third 1:1 coupler (26) and the first 50% output end of the fourth 1:1 coupler (35) are connected through a line;
the second mixer (28), the second filter (30) and the third high-speed acquisition module (31) are connected through a line;
the fourth high-speed acquisition module (32), the fourth O/E module (33), the second optical filter (34) and the second 50% output end of the fourth 1:1 coupler (35) are connected through a line.
Preferably, the optical fiber strain temperature coefficient test platform (38) comprises a main communication interface (38-1), a constant temperature and variable temperature box body (38-2), a first optical fiber clamping block (38-3), a second optical fiber clamping block (38-4), a heat preservation door (38-5), a first folding shell (38-6), a second folding shell (38-7), a universal wheel (38-8), a micro-displacement mechanism (38-9), a constant temperature cavity temperature sensor (38-10), a fixed end optical fiber clamp (38-11), an oil bath box locking mechanism (38-12) and an oil bath variable temperature box (38-13);
general communication interface (38-1): the system is a general communication interface for controlling the work of a test platform by an external computer system (1), sends communication commands including heating, heat preservation, refrigeration and stretching, and returns test data of a temperature sensor;
constant temperature-variable temperature box (38-2): the optical fiber strain temperature coefficient test platform is a main structure of the optical fiber strain temperature coefficient test platform;
first fiber clamping block (38-3): is the entrance of the tested optical fiber (37) into the test platform;
second fiber clamping block (38-4): the measured optical fiber (37) enters the inlet of the telescopic constant temperature cavity from the oil bath variable temperature cavity;
thermal insulating door (38-5): the door plate is a door plate of a constant temperature-variable temperature box body (38-2) and is used for reducing heat loss of an oil bath temperature-variable cavity and a stretching constant temperature cavity in the working process;
first folded housing (38-6): the test platform has the functions of ensuring the appearance integrity of the test platform and isolating the air flow between the 0-5 level constant temperature cavity and the external environment as far as possible; the folding and stretching of the shell is achieved by soft plastic or leather, with a typical thickness of 1.5mm, with a recommended thickness range of 1-2 mm;
second folded housing (38-7): the test platform has the functions of ensuring the appearance integrity of the test platform and isolating the air flow between the 0-5 level frame door panel and the external environment as far as possible; the shell is folded and stretched by soft plastics or leather and other materials, the typical thickness value is 1.5mm, and the recommended thickness range is 1-2 mm;
universal wheel (38-8): the number of the constant-temperature and variable-temperature box bodies (38-2) is 6, and the locking function is provided, so that the test platform is convenient to transfer and transport;
micro-displacement mechanism (38-9): the optical fiber stretching device is used for stretching the optical fiber at the stretching end in the constant-temperature cavity;
oven temperature sensor (38-10): temperature measurement feedback for the optical fiber in the stretching constant temperature cavity;
fixed end fiber clamp (38-11): the optical fiber fixing device is used for fixing an optical fiber at the fixed end in the stretching constant temperature cavity;
oil bath tank locking mechanism (38-12): the oil bath temperature changing box is used for ensuring the position of the oil bath temperature changing box in the temperature changing cavity to be fixed;
oil bath variable temperature box (38-13): the coiling optical fiber heating device is used for placing coiled optical fibers in an unstressed state, and is internally provided with an oil material and a resistance wire heating system which can heat the oil material.
Preferably, the constant-temperature and variable-temperature box body (38-2) comprises an oil bath constant-temperature cavity (38-2-1), a 5-level constant-temperature cavity (38-2-2), a 4-level constant-temperature cavity (38-2-3), a 3-level constant-temperature cavity (38-2-4), a 2-level constant-temperature cavity (38-2-5), a 1-level constant-temperature cavity (38-2-6) and a 0-level constant-temperature cavity (38-2-7); (38-2-2) - (38-2-7) are 6 constant temperature intercommunicating cavities;
oil bath temperature-variable cavity (38-2-1): a detachable oil bath temperature changing box (38-13) is arranged;
6 constant temperature intercommunicating cavities (38-2-2) - (38-2-7) for placing a micro-displacement mechanism for stretching the measured optical fiber (37) and a related clamp;
5-stage thermostatic chamber (38-2-2): the device is used for placing a fixed end optical fiber clamp (38-11), and is provided with 2 resistance wire heating devices (38-2-2-1), 4 sliding rails (38-2-2-2), 2 clamping plates (38-2-2-3) and 8 magnet pieces (38-2-2-4); the sizes and the layouts of the resistance wire heating device (38-2-2-1), the slide rail (38-2-2-2), the clamping plate (38-2-2-3) and the magnet piece (38-2-2-4) are consistent with those of the 4-level thermostatic cavity (38-2-3);
4-stage thermostatic chamber (38-2-3): 2 resistance wire heating devices (38-2-3-1), a limit switch group (38-2-3-2) (comprising 4 limit switches), 4 sliding rails (38-2-3-3), 2 clamping plates (38-2-4-4) and 8 magnet pieces (38-2-3-5) are designed; (ii) a
The limit switch group (38-2-3-2) comprises 4 limit switches;
3-level thermostatic chamber (38-2-4): 2 resistance wire heating devices (38-2-4-1), a limit switch group (38-2-4-2), 4 sliding rails (38-2-4-3), 2 clamping plates (38-2-4-4) and 8 magnet pieces (38-2-4-5) are designed; the sizes and the layouts of the resistance wire heating device (38-2-4-1), the limit switch group (38-2-4-2), the sliding rail (38-2-4-3), the clamping plate (38-2-4-4) and the magnet piece (38-2-4-5) are consistent with those of the 4-level thermostatic cavity (38-2-3);
the limit switch group (38-2-4-2) comprises 4 limit switches;
level 2 thermostatic chamber (38-2-5): 2 resistance wire heating devices (38-2-5-1), a limit switch group (38-2-5-2) (comprising 4 limit switches), 4 sliding rails (38-2-5-3), 2 clamping plates (38-2-5-4) and 8 magnet pieces (38-2-5-5) are designed; the sizes and the layouts of the resistance wire heating device (38-2-5-1), the limit switch group (38-2-5-2), the sliding rail (38-2-5-3), the clamping plate (38-2-5-4) and the magnet piece (38-2-5-5) are consistent with those of the 4-level thermostatic cavity (38-2-3) (38-2-3);
the limit switch group (38-2-5-2) comprises 4 limit switches;
level 1 thermostatic chamber (38-2-6): 2 resistance wire heating devices (38-2-6-1), a limit switch group (38-2-6-2), 4 sliding rails (38-2-6-3), 2 clamping plates (38-2-6-4) and 8 magnet pieces (38-2-6-5) are designed; the sizes and the layouts of the resistance wire heating device (38-2-6-1), the limit switch group (38-2-6-2), the sliding rail (38-2-6-3), the clamping plate (38-2-6-4) and the magnet piece (38-2-6-5) are consistent with those of the 4-level thermostatic cavity (38-2-3);
level 0 oven chamber (38-2-7): an air-conditioning refrigeration system (38-2-7-1), a resistance wire heating device (38-2-7-2) at 1 position and 4 limit switch groups (38-2-7-3) are designed.
Preferably, the 4-stage thermostatic chamber (38-2-3) comprises the following structure:
resistance wire heating device (38-2-3-1): 2 positions in total, 1 position of each of the top surface and the bottom surface has no bulge, and whether the heating is carried out is controlled by an external computer;
a limit switch group (38-2-3-2): the number of the top surfaces and the bottom surfaces are 2 respectively, the top surfaces and the bottom surfaces can move in a sliding rail (38-2-2-2) of a 5-level thermostatic chamber (38-2-2), the two ends of the sliding rail are limited, and meanwhile, the information that the limit switch group (38-2-3-2) reaches the two ends of the sliding rail (38-2-2-2) is informed to an external computer system;
slide rail (38-2-3-3): 4 limiting switches correspond to the positions of the limiting switch groups (38-2-4-2) of the 3-level thermostatic chambers (38-2-4) and provide a guiding function for the 3-level thermostatic chambers (38-2-4);
chucking plate (38-2-3-4): the upper and lower clamping sheets are totally embedded in side grooves of the level-4 constant temperature cavity (38-2-3) when the level-3 constant temperature cavity (38-2-4) is in an unstretched state, and the depth of the grooves is the same as the thickness of the clamping sheets; when the 3-level thermostatic chamber (38-2-4) is stretched and lengthened to a proper position, the clamping plate (38-2-3-4) is placed in the grooves on the top surface and the bottom surface, and the depth of the groove is 4-10 mm smaller than the thickness of the clamping plate, so that the 3-level thermostatic chamber (38-2-4) and the 4-level thermostatic chamber (38-2-3) can not move relatively in the stretching process of the optical fiber;
(38-2-3-5) magnet piece: the number of the clamping plates is 8, 1 is respectively arranged on the top surface groove and the bottom surface groove, 2 is arranged on the side surface groove, and 1 is respectively arranged on the front surface and the back surface of the two clamping plates (38-2-3-4); when the clamping plates (38-2-3-4) are arranged in the top surface groove, the bottom surface groove and the side surface groove, the clamping plates can be sucked by the corresponding magnet sheets to play a certain fixing role.
Preferably, the level 0 thermostatic chamber (38-2-7) comprises the following structure:
air-conditioning refrigeration system (38-2-7-1): when the temperature in the stretching constant-temperature cavity is higher than a set value, the refrigerating system is started to reduce the temperature in the cavity;
resistance wire heating device (38-2-7-2): because the micro-displacement mechanism (38-9) is arranged on the bottom surface of the level 0 thermostatic cavity (38-2-7), only 1 group of heating devices positioned on the top surface of the cavity body is designed.
A limit switch group (38-2-7-3): the total number of the groups is 4, and the layout is the same as that of the limit switch group (38-2-3-2).
Preferably, the first fiber clamping block (38-3) includes the following structure:
handle (38-3-1): the first optical fiber clamping block (38-3) is convenient to detach and insert;
fiber-passing groove (38-3-2): the semicircular groove structure is used for placing the optical fiber (37) to be detected and preventing the first optical fiber clamping block (38-3) from extruding the optical fiber (37) to be detected when being inserted into the constant-temperature and variable-temperature box body (38-2);
the first fiber clamping block (38-3) is structurally assembled as follows:
firstly, putting an optical fiber into an optical fiber penetrating groove, then inserting a first optical fiber clamping block (38-3) into a constant temperature-variable temperature box body (38-2), wherein the corresponding part of the constant temperature-variable temperature box body (38-2) adopts a dovetail groove-shaped matching structure, and the heat exchange between an oil bath temperature-variable cavity (38-2-1) and the outside is reduced as much as possible; the part of the tested optical fiber (37) contacting with the optical fiber insertion slot (38-3-2) is wrapped by asbestos and foam soft materials to reduce the air flow at the position of the optical fiber insertion slot.
Preferably, the second fiber clamping block (38-4) includes the following structure:
handle (38-4-1): the second optical fiber clamping block (38-4) is convenient to detach and insert;
fiber-passing groove (38-4-2): the semicircular groove structure is used for placing the optical fiber (37) to be detected and preventing the second optical fiber clamping block (38-4) from being extruded to the optical fiber (37) to be detected when being inserted into the constant-temperature and variable-temperature box body (38-2);
the structure of the second fiber clamping block (38-4) is assembled as follows:
firstly, putting an optical fiber into an optical fiber penetrating groove, then inserting a second optical fiber clamping block (38-4) into a constant temperature-variable temperature box body (38-2), and reducing heat exchange between an oil bath temperature-variable cavity (38-2-1) and stretching constant temperature cavities (38-2-2) - (38-2-7) as far as possible by adopting a step-shaped matching structure; the part of the optical fiber, which is contacted with the optical fiber insertion groove, is wrapped by asbestos and foam soft materials so as to reduce the air flow at the position of the optical fiber insertion groove; the section also defines an entrance chamfer to facilitate insertion of the second fiber clamping block (38-4).
Preferably, the thermal insulation door (38-5) comprises the following structure:
main frame door panel (38-5-1): the oil bath temperature-changing cavity (38-2-1) is used for sealing the oil bath temperature-changing cavity, and is also used for placing a frame door plate assembly and an inner core door plate assembly which are not pulled out, and 2 sliding rails (38-5-1-1) are arranged in the oil bath temperature-changing cavity;
4-level retractable door panel (38-5-2): belongs to a frame door plate component and is provided with 2 sliding rails (38-5-2-1) and 2 limiting blocks (38-5-2-2); can slide in a straight line in the sliding rail (38-5-1-1) and is limited by a limit block (38-5-2-2);
3-level retractable door panel (38-5-3): belongs to a frame door plate component and is provided with 2 sliding rails (38-5-3-1) and 2 limiting blocks (38-5-3-2); can slide in a straight line in the sliding rail (38-5-2-1) and is limited by a limit block (38-5-3-2);
2-stage retractable door panel (38-5-4): belongs to a frame door plate component and is provided with 2 sliding rails (38-5-4-1) and 2 limiting blocks (38-5-4-2); can slide in a straight line in the sliding rail (38-5-3-1) and is limited by a limit block (38-5-4-2); the size distribution of the sliding rail (38-5-4-1) and the limiting block (38-5-4-2) is consistent with that of the 4-level telescopic door panel (38-5-2);
level 1 retractable door panel (38-5-5): belongs to a frame door plate component and is provided with 2 sliding rails (38-5-5-1) and 2 limiting blocks (38-5-5-2); can slide in a straight line in the sliding rail (38-5-4-1) and is limited by a limit block (38-5-5-2); the size distribution of the sliding rail (38-5-5-1) and the limiting block (38-5-5-2) is consistent with that of the 4-level telescopic door panel (38-5-2);
0-level retractable door panel (38-5-6): 2 limit blocks (38-5-6-2) are designed; can slide in a straight line in the sliding rail (38-5-5-1) and is limited by a limit block (38-5-6-2);
level 5 inner core door panel (38-5-7): belongs to an inner core door plate component, and is provided with 2 sliding rails (38-5-7-1) and 2 limiting blocks (38-5-7-2); can slide in a straight line in the sliding rail (38-5-1-2) and is limited by a limit block (38-5-7-2);
level 4 inner core door panel (38-5-8): belongs to an inner core door plate component, 2 sliding rails (38-5-8-1) and 2 limiting blocks (38-5-8-2) are designed; can slide in a straight line in the sliding rail (38-5-7-1) and is limited by a limit block (38-5-8-2);
level 3 inner core door panel (38-5-9): belongs to an inner core door plate component, and is provided with 2 sliding rails (38-5-9-1) and 2 limiting blocks (38-5-9-2); can slide in a straight line in the sliding rail (38-5-8-1) and is limited by a limit block (38-5-9-2); the size layout of the sliding rail (38-5-9-1) and the limiting block (38-5-9-2) is consistent with that of the 4-level inner core door panel (38-5-8);
level 2 inner core door panels (38-5-10): belongs to an inner core door plate component, and is provided with 2 sliding rails (38-5-10-1) and 2 limiting blocks (38-5-10-2); can slide in a straight line in the sliding rail (38-5-9-1) and is limited by a limit block (38-5-10-2); the size layout of the sliding rail (38-5-10-1) and the limiting block (38-5-10-2) is consistent with that of the 4-level inner core door panel (38-5-8);
level 1 inner core door panel (38-5-11): belongs to an inner core door plate component and is provided with 2 limit blocks (38-5-11-1); can slide in a straight line in the sliding rail (38-5-10-1) and is limited by a limit block (38-5-11-1); the size distribution of the limiting block (38-5-11-1) is consistent with that of a 4-level inner core door plate (38-5-8);
hinge (38-5-12): the heat preservation door (38-5) is connected with the constant-temperature and variable-temperature box body (38-2) through 3-5 hinges, so that the door can be opened and closed; the contact part after closing the door is made of soft materials such as rubber or is of a step-shaped structure, so that air flow at the gap is reduced as much as possible; wherein the 0-level telescopic door panel (38-5-2) is connected with the 0-level thermostatic chamber (38-2-7) by at least 1 hinge;
door handle (38-5-13): the heat preservation door (38-5) is convenient to open and close;
when the 5-level constant temperature cavities sequentially extend from 0 to 5 levels, the 0-level telescopic door panel (38-5-2) and the frame door panel component synchronously extend one by one according to the 0 to 5-level sequence;
when the 1-level telescopic door plate is stretched, the 1-level inner core door plate can be synchronously pulled out.
Preferably, the main frame door panel (38-5-1) includes the following structure:
a slide rail (38-5-1-1); corresponding to the limiting block (38-5-2-2), the guiding function is provided for the 4-level telescopic door panel (38-5-2);
slide rail (38-5-1-2): corresponding to the limiting block (38-5-7-2), the guiding function is provided for the 5-level inner core door plate (38-5-7);
a 4-level telescopic door panel (38-5-2); the structure comprises the following structures:
slide rail (38-5-2-1): corresponding to the limiting block (38-5-3-2), the guiding function is provided for the 3-level telescopic door panel (38-5-3);
a limiting block (38-5-2-2): limiting the moving position of the 4-stage telescopic door panel (38-5-2);
a 3-level telescopic door panel (38-5-3); the structure comprises the following structures:
slide rail (38-5-3-1): corresponding to the limiting block (38-5-4-2), the guiding function is provided for the 2-level telescopic door panel (38-5-4);
a limiting block (38-5-3-2): limiting the moving position of the 3-level telescopic door panel (38-5-3);
0 level telescopic door panel (38-5-6), including following structure:
a limiting block (38-5-6-1): can move in the sliding rail (38-5-5-1) to limit the moving position of the 0-level telescopic door panel (38-5-6);
a class 5 inner core door panel (38-5-7) comprising the following structure:
slide rail (38-5-7-1): corresponding to the limiting block (38-5-8-2), the guiding function is provided for the 4-level inner core door plate (38-5-8);
a limiting block (38-5-7-2): limiting the movement position of the class 5 inner core door panel (38-5-7);
a class 4 inner core door panel (38-5-8) comprising the following structure:
slide rail (38-5-8-1): corresponding to the limiting block (38-5-9-2), the guiding function is provided for the 3-level inner core door plate (38-5-9);
a limiting block (38-5-8-2): limiting the movement position of the 4-stage inner core door panel (38-5-8);
preferably, the micrometric displacement mechanism (38-9) comprises the following steps:
servo control interface (38-9-1): is a communication interface for controlling the movement of the micro-displacement mechanism by an external computing system (1);
servo motor (38-9-2): the high-precision rotation variation can be generated;
coupling, screw (38-9-3): converting the rotation variation generated by the servo motor (38-9-2) into the linear displacement variation of the optical fiber clamp (38-9-4) at the stretching end;
draw end fiber clamp (38-9-4): a measured optical fiber (37) for fixing the stretching end;
screw (38-9-5): fixing a micro-displacement mechanism (38-9) on a 0-level constant-temperature cavity (38-2-7);
the micro-displacement mechanism (38-9) is fixed on the 0-level constant temperature cavity (38-2-7) through a screw (38-9-5), the servo motor (38-9-2) is controlled to rotate by the external computer system (1) through the servo control interface (38-9-1), and the rotation variation of the servo motor (38-9-2) is converted into the linear displacement variation of the optical fiber clamp (38-9-4) at the stretching end through the coupler and the screw (38-9-3);
the typical displacement stroke value of the micro-displacement mechanism (38-9) is 200mm, the stroke range is 150-300 mm, and the positioning precision is 1-3 mu m;
in the micro-displacement mechanism (38-9), the optical fiber clamp (38-9-4) at the stretching end moves towards the direction of the servo motor (38-9-2) to reduce the displacement and increase the optical fiber strain; movement in the opposite direction to the servo motor (38-9-2) is an increase in displacement and a decrease in fiber strain.
Preferably, the oven temperature sensor (38-10) comprises the following structure:
support bar (38-10-1): the tail part of the constant temperature cavity is fixed on the side walls of the 0-level and 5-level constant temperature cavities, and the middle part of the constant temperature cavity can be bent randomly; the tail part of the supporting rod can be additionally provided with a telescopic structure;
temperature-sensitive element (38-10-2): a Pt100 temperature sensor is selected.
Preferably, the fixed end fiber clamp (38-11) includes the following structure:
base (38-11-1): the bearing pressing plate (38-11-2) is used for pressing and fixing the tested optical fiber (37);
pressing plate (38-11-2): the device is used for pressing and fixing the tested optical fiber (37);
a handle (38-11-3);
screw (38-11-4): is used for fixing the pressure plate (38-11-2) and the base (38-11-1);
platen fiber holes (38-11-5): the diameter of the hole contacted with the measured optical fiber (37) has a negative tolerance with the diameter of the measured optical fiber (37), and the negative tolerance range of the diameter is phi-0.01 mm to-0.05 mm;
base fiber hole (38-11-6): the diameter of the hole contacted with the measured optical fiber (37) has a negative tolerance with the diameter of the measured optical fiber (37), and the negative tolerance range of the diameter is phi-0.01 mm to-0.05 mm;
the upper surface of the base (38-11-1) needs to be designed with a sinking surface, the pressing plate (38-11-2) is guaranteed to be sunk and placed by taking the sinking surface as a reference, the sinking surface of the base (38-11-1) and the corresponding surface of the pressing plate (38-11-2) guarantee that the verticality tolerance of the reference surface A, B is smaller than 0.01mm, the distances between the two surfaces and the centers of the semicircular holes of the optical fibers are strictly consistent, the distance tolerance requirement is smaller than 5 mu m, the contact length between the clamp and the optical fibers is larger than 100mm, namely the depth of the two semicircular holes is larger than 100mm, and therefore the large enough contact area between the clamp and the optical fibers is guaranteed.
Preferably, the oil bath incubator (38-13) comprises the following structure:
oil bath case housing (38-13-1): is the main structure of the oil bath temperature changing box (38-13);
control interface (38-13-2): is a control interface for controlling the temperature change of the oil bath tank by an external computer;
main hole (38-13-3): the tested optical fiber (37) is used for pouring oil and putting the oil into a coil; the typical diameter value of the main hole (38-13-3) is 270mm, and the diameter range is 250-300 mm;
main cover (38-13-4): the screw thread sealing structure is used for sealing the main hole;
rubber cover (38-13-5): the small hole (38-13-6) is used for sealing the small hole (38-13-6) and is only used before the optical fiber (37) to be tested is placed, and the small hole (38-13-6) is in an open state in the formal working process;
orifice (38-13-6): the part of the tested optical fiber (37) which is used for being placed in and out of the oil bath temperature-changing box (38-13) in the temperature-changing test working process; the typical diameter value of the small hole (38-13-6) is 10mm, and the diameter size range is 3-15 mm;
intersecting pore gap (38-13-7): is a gap formed by the intersection of the main hole (38-13-3) and the small hole (38-13-6); after the coiled optical fiber (37) to be detected is placed into the main hole (38-13-3), the two ends of the optical fiber enter the small hole (38-13-6) from the intersection hole gap (38-13-7); the typical value of the size of the alloy is 2-5 mm;
temperature sensor No. 1 (38-13-8): for measuring the temperature at the central position of the perforated partition (38-13-15);
temperature sensor No. 2 (38-13-9): for measuring the temperature of one corner of the perforated partition (38-13-15);
temperature sensor No. 3 (38-13-10): for measuring the temperature of one corner of the perforated partition (38-13-15);
temperature sensor No. 4 (38-13-11): for measuring the temperature of one corner of the perforated partition (38-13-15);
temperature sensor No. 5 (38-13-12): for measuring the temperature of one corner of the perforated partition (38-13-15);
the No. 1-5 temperature sensors are distributed in the center and 4 corner positions of the partition plate with the holes, temperature data of the five points are measured, and the computer can accurately calculate the temperature of the temperature field of the measured optical fiber by acquiring and processing the data in real time;
temperature sensor No. 6 (38-13-13): the device is used for measuring the output temperature of the heating resistance wire, accurately adjusting the temperature change of the oil bath temperature change box, and simultaneously monitoring the working state of the heating resistance wire to prevent high-temperature damage;
resistance wire heating device (38-13-14): heating the oil, and controlling the heating power of the oil by an external computer system;
perforated partition (38-13-15): the device is used for placing the measured optical fiber in the temperature-varying test process, an aluminum alloy material is used, the typical diameter size of the hole in the partition plate is 15mm, and the diameter size range is 10-25 mm;
a handle (38-13-16);
oil change ports (38-13-17): the outlet of the oil is replaced.
In addition, the invention also provides an automatic testing method for the Brillouin intensity and frequency shift strain temperature coefficient of the optical fiber, which adopts the automatic testing system for the Brillouin intensity and frequency shift strain temperature coefficient and comprises the following steps:
step 101: the computer system (1) carries out self-inspection on the automatic testing system of the Brillouin intensity and the frequency shift strain temperature coefficient;
step 102: judging whether the self-checking passes, if so, performing step 103, and if not, performing step 104;
step 103: displaying and outputting an error prompt to wait for processing;
step 104: putting the tested optical fiber into an optical fiber strain temperature coefficient test platform (38), wherein a part of the optical fiber with the length of TLV is put into an oil bath temperature-variable box (38-13) to be used as the tested optical fiber with the temperature coefficient TFUT; one part of the fiber is fixed between a stretching end fiber clamp (38-9-4) and a fixed end fiber clamp (38-11) in a tensioned state and is used as a strain coefficient tested fiber SFUT;
step 105: setting the optical fiber length FL, sampling resolution SR parameters, test starting frequency FS, test ending frequency FE, test frequency interval FI, pulse width PW, accumulation times AT, 1310nm refractive INDEX INDEX13 and 1550nm refractive INDEX INDEX 15;
step 106: starting an automatic positioning function, acquiring the 1550nm position TPV15 and the 1310nm position TPV13 of a temperature coefficient tested optical fiber TFUT, and the 1550nm position SPV15 and the 1310nm position SPV13 of a strain coefficient tested optical fiber SFUT, and automatically controlling the movement of a micro-displacement structure (38-9) to enable the optical fiber to be in a critical strain state;
step 107: manually measuring the length SLV of an optical fiber strain acting area between a stretching end optical fiber clamp (38-9-4) and a fixed end optical fiber clamp (38-11);
step 108: inputting the length SLV of the optical fiber strain action area and the length TLV of the optical fiber temperature action area;
step 109: starting a coefficient automatic analysis function, and obtaining 1310 strength strain coefficient PS13 and 1310 strength temperature coefficient; PT13, 1310 frequency-shifted strain coefficient FS13, 1310 frequency-shifted temperature coefficient FT13, 1550 strength strain coefficient PS15, 1550 strength temperature coefficient PT15, 1550 frequency-shifted strain coefficient FS15, 1550 frequency-shifted temperature coefficient FT 15;
step 110: and displaying and outputting 1310 strength strain coefficient PS13, 1310 strength temperature coefficient PT13, 1310 frequency shift strain coefficient FS13, 1310 frequency shift temperature coefficient FT13, 1550 strength strain coefficient PS15, 1550 strength temperature coefficient PT15, 1550 frequency shift strain coefficient FS15 and 1550 frequency shift temperature coefficient FT15, and finishing the test process.
Preferably, in step 104, the step of laying the temperature coefficient measured optical fiber and the strain coefficient measured optical fiber on the optical fiber strain temperature coefficient test platform includes the following specific steps:
step 201: dividing the tested optical fiber into 5 parts, namely an optical fiber access end external redundant optical fiber RYOFS with the length of RYFS, the typical value of which is 50m, the recommended length range is 20m < RYFS <5000m, the optical fiber is used for being placed outside an optical fiber strain temperature coefficient test platform (38), the temperature coefficient tested optical fiber TFUT with the length of TLV, the typical value of TLV is 10m, the recommended length range is 5m < TLV < 20m, the optical fiber is used for being placed in an oil bath temperature variation box (38-13), the strain coefficient tested optical fiber SFUT with the length of larger than SLV is used for being placed in an oil bath temperature variation box (38-2-7), the length range of the optical fiber SFUT with the length of 0.15m < SLV <1.2m, the optical fiber SFUT is used for being placed in a 5-level thermostatic chamber (38-2-2) -0-7), one side close to the TFUT is a fixed end, the other side is a stretching end, the optical fiber with the length of JG01, the typical value of the optical fiber is 1.5m, the recommended size range of JG01<3m, is the portion where the external redundant fiber is connected to the TFUT; an intracavity spacer fiber of length JG02, typically 0.8m, with recommended dimensions in the range of 0.6m < JG02<1.2m, being the part where TFUT and SFUT are connected and a fiber end external redundant fiber RYOFE of length RYFE, typically 20m, with recommended lengths in the range of 10m < RYFE <100m, for placement outside of the fiber strain temperature coefficient test platform (38); at the moment, the optical fiber strain temperature coefficient test platform (38) is in a non-lengthened state, and the heat preservation door (38-5) is in a closed state;
step 202: judging the number NJ of the constant temperature cavity stages needing to be pulled out according to the length SFUT of the stretched optical fiber, wherein the number NJ of the constant temperature cavity stages is initially assigned to be 0 as the 0-stage constant temperature cavity is pulled out firstly;
step 203: judging that (NJ +1) × 0.18 is not less than SFUT; "yes" goes to step 206, and "no" goes to step 204;
step 204: the NJ-level constant-temperature cavity is pulled out manually, the NJ-level telescopic door panel is pulled out, and after the NJ-level telescopic door panel is pulled out, the NJ-level corresponding limit switch (38-2-7-3) is automatically and simultaneously in an electrified opening state, wherein NJ is NJ + 1;
step 205: opening the clamping plate (38-2-6-4), clamping the NJ-level constant-temperature cavity, and performing step 203;
step 206: opening the heat preservation door (38-5), and enabling the door handle (38-5-13) to be supported on a supporting plane including the ground or the table top;
step 207: drawing out the first optical fiber clamping block (38-3) and the second optical fiber clamping block (38-4), and opening the main cover (38-13-4) and the rubber cover (38-13-5);
step 208: passing the temperature coefficient measured optical fiber TFUT with length TLV through the main hole (38-13-3) to be placed on the perforated partition plate (38-13-15) in a relaxed coiled state;
step 209: moving the extra-cavity spacing optical fiber with the length of JG01 and the intra-cavity spacing optical fiber with the length of JG02 into the small hole (38-13-6) from the intersection hole gap (38-13-7), and then placing and screwing the main cover (38-13-4) on the main hole (38-13-3);
step 210: penetrating an intracavity interval optical fiber with the length of JG02 from an optical fiber penetrating groove (38-4-2) into a stretching constant temperature cavity, and wrapping a part which is contacted with the optical fiber penetrating groove (38-4-2) by a little asbestos;
step 211: fixing the fixed end of the SUFT on a fixed end optical fiber clamp (38-11), namely unscrewing a screw (38-11-4), taking out a pressing plate (38-11-2), placing the fixed end of the SFUT in the base optical fiber hole (38-11-6), pressing the pressing plate (38-11-2) on the base (38-11-1) to ensure that the measured optical fiber corresponds to the pressing plate optical fiber hole (38-11-5), and screwing the screw (38-11-4);
step 212: moving a stretching end optical fiber clamp (38-9-4) to the total displacement middle position of a micro displacement mechanism (38-9), fixing the stretching end of the optical fiber SUFT with the strain coefficient to be measured on the stretching end optical fiber clamp (38-9-4), wherein the detailed steps are the same as the step 211, and simultaneously enabling the SUFT to be in a tense state as much as possible;
step 213: confirming that no bend radius of the intracavity spaced fiber of length JG02 below 0.05m is present, inserting a second fiber clamping block (38-4);
step 214: an extra-cavity interval optical fiber with the length of JG01 is penetrated through an optical fiber penetrating groove (38-3-2), and a part contacted with the optical fiber penetrating groove (38-4-2) is wrapped by a little asbestos;
step 215: confirming that no bend radius of the extra-cavity spacer fiber of length JG01 less than 0.05m is present, inserting a first fiber clamping block (38-3);
step 216: and closing the heat preservation door (38-5), and finishing the installation of the tested optical fiber (37).
Preferably, in step 106, the specific steps of the automatic positioning function of the optical fiber TFUT and the strain coefficient measured optical fiber SFUT are as follows:
step 301: reading related data of an optical fiber strain temperature coefficient test platform (38) through a communication interface (38-1), wherein the related data comprises opening state data LCKG [ 0-3 ] of a limit switch group (38-2-3-2), a limit switch group (38-2-4-2), a limit switch group (38-2-5-2), and limit switch group (38-2-6-2), single-stage extension length SCL, 5 th-stage constant temperature cavity length DJSCL5, 0 th-stage constant temperature cavity length DJSCL0, uniform temperature HWQ of 6 constant temperature intercommunicated cavities (38-2-2) - (38-2-7), and uniform temperature TYBWQ of an oil bath variable temperature cavity (38-2-1); calculating the total number of data 1 in the LCKG [ 0-3 ] as the number SCN of the elongation nodes of the thermostatic chamber,
step 302: calculating using constant temperature cavity length SCL ═ DJSCL0+ DJSCL5+ SCN ×. DJSCL, calculating single fiber draw FLSL ═ SCL 50 ×. 0.000001, if FLSL ≦ 10 μm then FLSL is 10 μm, setting single temperature change TSJW ═ 5 ℃;
step 303: calculating the SPV15 and SPV13 of the tested optical fiber SFUT at 1550nm and 1310 nm;
step 304: determine "return failure information? "," yes "goes to step 305, and" no "goes to step 306;
step 305: displaying failure information, and rechecking the optical fiber adhesion;
step 306: the temperature coefficient measured optical fiber TFUT is at 1550nm position TPV15 and 1310nm position TPV 13;
step 307: determine "return failure information? "," yes "goes to step 308, and" no "goes to step 309;
step 308: displaying failure information, and rechecking the optical fiber in the oil bath temperature change box (38-13);
step 309: automatically controlling the micro-displacement structure (38-9) to move to enable the optical fiber to be in a critical strain state;
step 310: and the function is finished and success information is returned.
Preferably, in step 109, the specific steps of the automatic testing and analyzing function of the strain coefficient and the temperature coefficient are as follows:
step 401: reading the SPV15 and SPV13 at 1550nm and the SPV13 at 1310nm of the fiber SFUT, the TPV15 and TPV13 at 1550nm and the TYYBWQ at 1550nm and the uniform temperature of the oil bath temperature-changing cavity (38-2-1), and asking a user to input a displacement interval FLJG with a typical value of 200 mu epsilon SLV and rounding up with a unit of mu m; calculating the strain displacement number NN to be 5000/FLSL and rounding downwards; please the user to enter a temperature ramp interval TUSW, typically 5 ℃ and rounded up to a minimum of 2 ℃; calculating the temperature rise times MM ═ 120-TYBWQ)/TUSW and rounding downwards;
step 402: initializing 1310 strength strain coefficient temporary arrays DATAPS13[ 0-NN ], 1310 strength temperature coefficient temporary arrays DATAPT13[ 0-MM ], 1310 frequency shift strain coefficient temporary arrays DATAFS13[ 0-NN ], 1310 frequency shift temperature coefficient temporary arrays DATAFT13[ 0-MM ], 1550 strength strain coefficient temporary arrays DATAPS15[ 0-NN ], 1550 strength temperature coefficient temporary arrays DATAPT15[ 0-MM ], 1550 frequency shift strain coefficient temporary arrays DATAFS15[ 0-NN ], 1550 frequency shift temperature coefficient temporary arrays DATAFT15[ 0-MM ], temperature record arrays TCURR [ 0-MM ], strain record arrays SCURR [ 0-NN ] with all values of 0, and initializing variable J as 0;
step 403: starting a test system for single test, reading 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], 1310 Brillouin intensity data DATABPO13[ 0-N ], 1550 Brillouin intensity data DATABPO15[ 0-N ];
step 404: DATAPS13[ J ] ═ DATABPO13[ SPV13], DATAFS13[ J ] ═ DATACF13[ SPV13], DATAPS15[ J ] ═ DATABPO15[ SPV15], DATAFS15[ J ] ═ DATACF15[ SPV15], DATAPT13[ J ] ═ DATABPO13[ TPV13], DATAFT13[ J ] ═ DATACF13[ TPV13], DATAPT15[ J ] ═ DATABPO15[ TPV15], DATAFT15[ J ] ═ DATACF15[ TPV15], J = 1;
step 405: calculating the current strain SCURR _ SFUT (J) FLJG/SLV of the measured optical fiber SFUT with the strain coefficient, and calculating the current temperature TCURR _ TFUT (TYYBWQ) of the measured optical fiber TFUT with the temperature coefficient;
step 406: controlling a micro-displacement mechanism (38-9) in an optical fiber strain temperature coefficient test platform (38) to stretch an optical fiber to tighten the optical fiber, wherein the moving distance is FLSL;
step 407: starting a test system for single test, and reading 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], 1310 Brillouin intensity data DATABPO13[ 0-N ], 1550nm Brillouin spectrum center frequency data DATABPO15[ 0-N ]1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ];
step 408: DATAPS13[ J ] ═ DATABPO13[ SPV13], DATAFS13[ J ] ═ DATACF13[ SPV13], DATAPS15[ J ] ═ DATABPO15[ SPV15], DATAFS15[ J ] ═ DATACF15[ SPV15], SCURR [ J ] ═ SCURR _ SFT;
step 409: judging J < NN, "yes" to proceed to step 410; NO goes to step 411;
step 410: j +1, go to step 406;
step 411: setting the temperature of an oil bath variable temperature cavity (38-2-1) as MBWD ═ TYBWQ + TUSW, and continuously reading TYBWQ until TYBWQ is equal to MBWD and lasts for 5 minutes;
step 412: starting a single test of the test system, specifically referring to step 501, reading 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], 1310 Brillouin intensity data DATABPO13[ 0-N ], 1550 Brillouin intensity data DATABPO15[ 0-N ]1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], and initializing J to 1;
step 413: DATAPT13[ J ] ═ DATABPO13[ TPV13], DATAFT13[ J ] ═ DATACF13[ TPV13], DATAPT15[ J ] ═ DATABPO15[ TPV15], DATAFT15[ J ] ═ DATACF15[ TPV15], TCURR [ J ] ═ TCURR _ TFUT;
step 414: determining J < MM, yes to proceed to step 415, no to proceed to step 416;
step 415: j ═ J +1, go to step 411;
step 416: using SCURR [ 0-NN ] as x-axis data, and using DATAPS13[ 0-NN ], DATAFS13[ 0-NN ], DATAPS15[ 0-NN ], DATAFS15[ 0-NN ] as y-axis data to perform linear fitting calculation to obtain 1310 strength strain coefficient PS13, 1310 frequency shift strain coefficient FS13, 1550 strength strain coefficient PS15 and 1550 frequency shift strain coefficient FS 15;
step 417: TCURR [ 0-MM ] is taken as x-axis data, DATAPT13[ 0-MM ], DATAFT13[ 0-MM ], DATAPT15[ 0-MM ], and DATAFT15[ 0-MM ] are respectively taken as y-axis data to perform linear fitting calculation to obtain 1310 strength temperature coefficient PT13, 1310 frequency shift temperature coefficient FT13, 1550 strength temperature coefficient PT15 and 1550 frequency shift temperature coefficient FT 15.
Preferably, in steps 403 and 407, the specific steps of the test system for single test function are as follows:
step 501: inputting a pulse width PW, a 1550nm refractive INDEX INDEX15 of the measured optical fiber, a 1310nm refractive INDEX INDEX13 of the measured optical fiber, a measuring range RP, a starting frequency FS, a stopping frequency FE, a frequency interval FA, an accumulation frequency AT, a distance resolution SR and other test parameters by a user, wherein the number N of distance acquisition data is RP/SR, and starting a test;
step 502: reading test parameters, calculating single test time TU (2) INDEX15 RP/vacuum light speed C according to the measuring range RP and the refractive INDEX IN of the measured optical fiber, determining sampling interval time TS according to the distance resolution SR, and calculating the number M of frequency acquisition data (FE-FS)/FA;
step 503: starting a 1310nm ultra-narrow line width light source (3) and a 1550nm ultra-narrow line width light source (20), assigning a local oscillation signal frequency BZF as FS, and setting the BZF to a first local oscillation module (11) and a second local oscillation module (29);
step 504: 1310 Brillouin spectrum test data DATABS13[ 0-M ] [ 0-N ] is assigned to 0, 1310 Brillouin intensity test data DATABP13[ 0-N ] is assigned to 0, 1550 Brillouin spectrum test data DATABS15[ 0-M ] [ 0-N ] is assigned to 0, 1550 Brillouin intensity test data DATABP15[ 0-N ] is assigned to 0, and frequency count FIN is assigned to 0;
step 505: assigning the cumulative number counter ATT to 0, assigning 1310 single Brillouin spectrum data DATABSO13[ 0-N ] to 0, assigning 1310 single Brillouin intensity data DATABPO13[ 0-N ] to 0, assigning 1550 single Brillouin spectrum data DATABSO15[ 0-N ] to 0, and assigning 1550 single Brillouin intensity data DATABPO15[ 0-N ] to 0;
step 506: starting a timing sequence timing TQ, starting a first local oscillator module (11) and a second local oscillator module (29), starting a 1310nm pulse modulation module (5) and a 1550nm pulse modulation module (22) to realize generation of a single test detection pulse, simultaneously starting a first high-speed sampling module (14), acquiring 1310 temporary Brillouin spectrum data DATABSO13T [ 0-N ], starting a second high-speed sampling module (15), acquiring 1310 temporary Brillouin intensity data DATABPO13T [ 0-N ], starting a third high-speed sampling module (31), acquiring 1550 temporary Brillouin data DATABSO15T [ 0-N ], starting a fourth high-speed sampling module (32), and acquiring 1550 temporary Brillouin intensity data DATABPO15T [ 0-N ];
step 507: waiting for the timing value of the timing sequence timing TQ to reach the single test time TU, and stopping the first high-speed sampling module (14), the second high-speed sampling module (15), the third high-speed sampling module (31) and the fourth high-speed sampling module (32);
step 508: 1310 single brillouin spectral data:
DATABSO13[0 to N ] ═ DATABSO13[0 to N ] + DATABSO13T [0 to N ], 1310 single brillouin intensity data DATBPRO13[0 to N ] ═ DATABSO13[0 to N ] + DATABSO13T [0 to N ], DATABSO15[0 to N ] ═ DATABSO15[0 to N ] + DATABSO15T [0 to N ], 1550 single brillouin intensity data DATABSO15[0 to N ] = DATABSO15[0 to N ] + DATABSO15T [0 to N ];
step 509: judging that ATT is larger than or equal to AT, carrying out step 511 if yes, and carrying out step 510 if no;
step 510: ATT ═ ATT + 1;
step 511: DATABS13[ FIN ] [ 0-N ] ═ DATABSO13[ 0-N ],
DATABP13[0～N]＝DATABP13[0～N]+DATABPO13[0～N]，
DATABS15[FIN][0～N]＝DATABSO15[0～N]，
DATABP15[0～N]＝DATABP15[0～N]+DATABPO15[0～N]；
step 512: assigning the local oscillation signal frequency BZF as BZF + FA, setting the BZF to a first local oscillation module (11) and a second local oscillation module (29), and setting FIN to FIN + 1;
step 513: judging whether BZF is larger than or equal to FE; "yes" goes to step 514, and "no" goes to step 505;
step 514: lorentz fitting is carried out on DATABS13[ 0-M ] [ 0-N ] and DATABS15[ 0-M ] [ 0-N ] according to distance point distribution to obtain 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ];
step 515: outputting DATACF13[ 0-N ], DATABP13[ 0-N ], DATABP15[ 0-N ] and DATACF15[ 0-N ] to a display interface, and ending the test.
Preferably, in step 303, the specific steps of the automatic positioning function of the strain coefficient measured optical fiber SFUT optical fiber are as follows:
step 601: reading an effective change threshold multiple ACTH (percent of total number of pixels) to be 5, calculating an effective change threshold window width multiple ACTHWT (percent of total number of pixels) to be 10/SCL, calculating a judgment window length PDWL (percent of total number of pixels) to be SCL/SR, performing initialization judgment at 1310nm to judge a value of an array ISCHANGE13[ 0-N ] to be 0, performing initialization judgment at 1550nm to judge a value of an array ISCHANGE15[ 0-N ] to be 0, and performing initialization variable J to be 0;
step 602: starting a test system for single test, reading 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], 1310 Brillouin intensity data DATABPO13[ 0-N ], 1550 Brillouin intensity data DATABPO15[ 0-N ];
step 603: 1310nm Brillouin spectrum center frequency BASE data DATACF13_ BASE [ 0-N ] ═ DATACF13[ 0-N ]
BASE data DATACF15_ BASE [ 0-N ] ═ DATACF15[ 0-N ];
step 604: controlling a micro-displacement mechanism (38-9) in an optical fiber strain temperature coefficient test platform (38) to stretch an optical fiber, wherein the stretching length of the optical fiber is FLSL;
step 605: starting a test system for single test, and reading 1310nm Brillouin spectrum central frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum central frequency data DATACF15[ 0-N ];
step 606: calculating 1310nm Brillouin spectrum center frequency change data DATACF13_ DIFF [ 0-N ] ═ DATACF13[ 0-N ] -/DATACF 13_ BASE [ 0-N ]; calculating 1550nm Brillouin spectrum center frequency change data DATACF15_ DIFF [ 0-N ] ═ DATACF15[ 0-N ] -/DATACF 15_ BASE [ 0-N ], and initializing variable I to 0;
step 607: calculating the standard deviation of STD13 ═ DATACF13_ DIFF [ I-I + PDWL: ] and STD15 ═ DATACF15_ DIFF [ I-I + PDWL: ] respectively;
step 608: judging DATACF13_ DIFF [ I ] > STD13 _ ACTH, if yes, performing step 609, and if no, performing step 610;
step 609: ISCHANGE13[ I ] ═ ISCHANGE13[ I ] + 1;
step 610: determining DATACF15_ DIFF [ I ] > STD15 × ACTH, yes to perform step 613, no to perform step 611;
step 611: i ═ I + 1;
step 612: determine I > N, "Yes" proceeds to step 614, No "proceeds to step 607;
step 613: ISCHANGE13[ I ] ═ ISCHANGE13[ I ] +1, go to step 611;
step 614: determine J <4, "yes" to proceed to step 615, and "no" to proceed to step 616;
step 615: j +1, go to step 604;
step 616: initializing the variable I1 to 0, and performing step 619;
step 617: i1 ═ I1+1, go to step 619;
step 618: determine I1< N, "yes" to proceed to step 617, "no" to proceed to step 635;
step 619: judging ISCHENGE 13[ I1] ≧ 3, "YES" go to step 620, "NO" go to step 618;
step 620: initializing a variable K1 to 1, and performing step 623;
step 621: k1 ═ K1+1, go to step 623;
step 622: decision K1< N, "yes" goes to step 621, "no" goes to step 624;
step 623: judging that ISCHENGE 13[ I1+ K1] is not less than 3, if yes, performing step 622, and if no, performing step 624;
step 624: SPV13 is the median value I1 to I1+ K1, and step 625 is performed;
step 625: the initialization variable I1 is 0;
step 626: judging that ISCHANGE15[ I1] ≧ 3, "YES" go to step 629, "NO" go to step 627;
step 627: determine I1< N, "Yes" goes to step 628, No "goes to step 635;
step 628: i1 ═ I1+1, go to step 626;
step 629: initializing the variable K1 to 1, and performing step 632;
step 630: k1 ═ K1+1, go to step 632;
step 631: judging K1< N, "yes" to proceed to step 630, "no" to proceed to step 633;
step 632: judging that ISCHENGE 15[ I1+ K1] is not less than 3, if yes, executing step 631, and if no, executing step 633;
step 633: SPV15 is the median of I1-I1 + K1;
step 634: the positioning is successful, and the values of the SPV13 and the SPV15 are output;
step 635: and returning failure information when the positioning fails.
Preferably, in step 306, the specific steps of the function of automatically positioning the temperature coefficient measured optical fiber TFUT optical fiber are as follows:
step 701: reading an effective change threshold multiple ACTH (percent of total number of pixels) to be 5, calculating an effective change threshold window width multiple ACTHWT (percent of total number of pixels) to be 10/SCL, calculating a judgment window length PDWL (percent of total number of pixels) to be SCL/SR, performing initialization judgment at 1310nm to judge a value of an array ISCHANGE13[ 0-N ] to be 0, performing initialization judgment at 1550nm to judge a value of an array ISCHANGE15[ 0-N ] to be 0, and performing initialization variable J to be 0;
step 702: starting a test system for single test, specifically referring to step 501, reading 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], 1310 Brillouin intensity data DATABPO13[ 0-N ] and 1550 Brillouin intensity data DATABPO15[ 0-N ];
step 703: 1310nm Brillouin spectrum center frequency BASE data DATACF13_ BASE [ 0-N ] ═ DATACF13[ 0-N ], 1550nm Brillouin spectrum center frequency BASE data DATACF15_ BASE [ 0-N ] ═ DATACF15[ 0-N ];
step 704: reading the uniform temperature TYYBWQ of the oil bath temperature-changing cavity (38-2-1), setting the temperature of the oil bath temperature-changing cavity (38-2-1) as MBWD ═ TYYBWQ + TSJW, and continuously reading TYYBWQ until TYYBWQ is equal to MBWD and lasts for 5 minutes;
step 705: starting a test system for single test, specifically referring to step 501, reading 1310nm Brillouin spectrum central frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum central frequency data DATACF15[ 0-N ];
step 706: calculating 1310nm Brillouin spectrum center frequency change data DATACF13_ DIFF [ 0-N ] ═ DATACF13[ 0-N ] -/DATACF 13_ BASE [ 0-N ]; calculating 1550nm Brillouin spectrum center frequency change data DATACF15_ DIFF [ 0-N ] ═ DATACF15[ 0-N ] -/DATACF 15_ BASE [ 0-N ], and initializing variable I to 0;
step 707: calculating the standard deviation of STD13 ═ DATACF13_ DIFF [ I-I + PDWL ACTHWT ]
STD15 ═ standard deviation of DATACF15_ DIFF [ I to I + PDWL ACTHWT ];
step 708: judging DATACF13_ DIFF [ I ] > STD13 _ ACTH, if yes, performing step 709, and if no, performing step 710;
step 709: ISCHANGE13[ I ] ═ ISCHANGE13[ I ] + 1;
step 710: judging DATACF15_ DIFF [ I ] > STD15 _ ACTH, if yes, performing step 713, and if no, performing step 711;
step 711: i +1, go to step 712;
step 712: judging I > N, if yes, proceeding to step 714, if no, proceeding to step 707;
step 713: ISCHANGE13[ I ] ═ ISCHANGE13[ I ] +1, go to step 711;
step 714: determine J <2, "yes" to proceed to step 715, "no" to proceed to step 716;
step 715: j +1, go to step 704;
step 716: initializing the variable I1 to 0, and performing step 719;
step 717: i1 ═ I1+1, go to step 719;
step 718: determine I1< N, "yes" to proceed to step 717, "no" to proceed to step 735;
step 719: judging ISCHENGE 13[ I1] ≧ 2, "YES" go to step 720, "NO" go to step 718;
step 720: initializing a variable K1 to 1, and performing step 723;
step 721: k1 ═ K1+1, go to step 723;
step 722: determine K1< N, "yes" to proceed to step 721, "no" to proceed to step 724;
step 723: judging that ISCHE 13[ I1+ K1] is not less than 2, if yes, performing step 722, and if no, performing step 724;
step 724: TPV13 is the median value of I1-I1 + K1;
step 725: the initialization variable I1 is 0;
step 726: judging ISCHENGE 15[ I1] ≧ 2, "YES" go to step 729, "NO" go to step 727;
step 727: determine I1< N, "yes" to proceed to step 728, "no" to proceed to step 735;
step 728: i1 ═ I1+1, go to step 726;
step 729: initializing variable K1 to 1, and proceeding to step 732;
step 730: k1 ═ K1+1, proceed to step 732;
step 731: determine K1< N, "yes" to proceed to step 730, "no" to proceed to step 733;
step 732: judging that ISCHE 15[ I1+ K1] is not less than 2, if yes, performing step 731, and if no, performing step 733;
step 733: TPV15 is the median value of I1-I1 + K1;
step 734: if the positioning is successful, outputting the values of TPV13 and TPV 15;
step 735: and returning failure information when the positioning fails.
Preferably, in step 309, the specific steps of the automatic control function of the critical strain state of the strain coefficient measured optical fiber SFUT are as follows:
step 801: reading an effective change threshold multiple ACTH (percent of change) to be 5, calculating an effective change threshold window width multiple ACTHWT to be 10/SCL, calculating a judgment window length PDWL to be SCL/SR, reading strain coefficient tested optical fibers SFUT at 1550nm position SPV15 and 1310nm position SPV13, and initializing an initialization variable J to be 0;
step 802: starting a test system for single test, specifically referring to step 501, reading 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], 1310 Brillouin intensity data DATABPO13[ 0-N ] and 1550 Brillouin intensity data DATABPO15[ 0-N ];
step 803: 1310nm Brillouin spectrum center frequency BASE data DATACF13_ BASE [ 0-N ] ═ DATACF13[ 0-N ]
BASE data DATACF15_ BASE [ 0-N ] ═ DATACF15[ 0-N ];
step 804: controlling a micro-displacement mechanism (38-9) in the optical fiber strain temperature coefficient test platform (38) to stretch the optical fiber in the opposite direction, so that the optical fiber is relaxed, wherein the moving distance is FLSL, if the boundary limit switch information of the micro-displacement mechanism (38-9) is received in the moving process, the function is finished, and failure information is returned;
step 805: starting a test system for single test, specifically referring to step 501, reading 1310nm Brillouin spectrum central frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum central frequency data DATACF15[ 0-N ];
step 806: calculating 1310nm Brillouin spectrum center frequency change data DATACF13_ DIFF [ 0-N ] ═ DATACF13_ BASE [ 0-N ] -DATACF13[ 0-N ]; calculating 1550nm Brillouin spectrum center frequency change data DATACF15_ DIFF [ 0-N ] ═ DATACF15_ BASE [ 0-N ] -DATACF15[ 0-N ], and initializing variable I to 0;
step 807: 1310nm Brillouin spectrum center frequency BASE data DATACF13_ BASE [ 0-N ] ═ DATACF13[ 0-N ]
BASE data DATACF15_ BASE [ 0-N ] ═ DATACF15[ 0-N ];
step 808: calculating the standard deviation of STD13 ═ DATACF13_ DIFF [ SPV 13-SPV 13+ PDWL ×. ACTHWT ], and STD15 ═ DATACF15_ DIFF [ SPV 15-SPV 15+ PDWL ×. ACTHWT ];
step 809: determining DATACF13_ DIFF [ SPV13] < STD13 × ACTH, yes to proceed to step 810, no to proceed to step 804;
step 810: determining DATACF15_ DIFF [ SPV15] < STD15 × ACTH, yes to proceed to step 811, no to proceed to step 804;
step 811: the automatic operation is successful, the fiber SFUT with the strain coefficient tested is in the critical strain state, and the success information is returned.
The invention has the following beneficial technical effects:
the invention provides an automatic testing method of 1310nm and 1550nm dual-band Brillouin scattering intensity and frequency shift strain temperature coefficients, designs a portable and telescopic optical fiber strain temperature coefficient testing platform which can meet the requirements of different optical fiber strain action areas, realizes the automatic testing of the Brillouin scattering intensity strain coefficient, the intensity temperature coefficient, the frequency shift strain coefficient and the frequency shift temperature coefficient of 1310nm and 1550nm two wavelengths, improves the testing efficiency of the optical fiber strain temperature coefficient, improves the coefficient analysis precision, provides technical support for an optical fiber strain distribution tester of intensity and frequency dual demodulation decoupling type of Brillouin scattering signals, and further improves the application range of the optical fiber strain distribution tester.
Drawings
Fig. 1 is a schematic diagram of a brillouin optical time domain reflectometer for composite test of optical fiber strain and temperature distribution.
Wherein, 1-a computer system; 2-a first pulse modulation control module; 3-1310nm laser; 4-a first 9:1 coupler; 5-1310nm pulse modulation module; 6-1310nm Raman amplifier; 7-1310nm optical circulator; 8-1310nm polarization scrambler; 9-a first O/E module; 10-a first mixer; 11-a first local oscillator module; 12-first 1:1 coupler; 13-a first filter; 14-a first high-speed acquisition module; 15-a second high-speed acquisition module; 16-a second O/E module; 17-first optical filtering; 18-a second 1:1 coupler; 19-a second pulse modulation control module; 20-1550nm laser; 21-a second 9:1 coupler; 22-1550nm pulse modulation module; a 23-1550nm Raman amplifier; 24-1550nm optical circulator; 25-1550nm polarization scrambler; 26-a third 1:1 coupler; 27-a third O/E module; 28-a second mixer; 29-a second local oscillator module; 30-a second filter; 31-a third high-speed acquisition module; 32-a fourth high-speed acquisition module; 33-a fourth O/E module; 34-second light filtering; 35-fourth 1:1 coupler; 36-1310nm/1550nm wavelength division multiplexer; 37-measured optical fiber; 38-optical fiber strain temperature coefficient test platform.
FIG. 2 is a schematic structural diagram of a platform for testing temperature coefficient of strain of an optical fiber under non-lengthening.
(a) Is a schematic view of a door closing state; (b) is a schematic view of the door opening state.
FIG. 3 is a schematic structural diagram of a fiber strain temperature coefficient test platform under five-stage lengthening.
Fig. 4 is a schematic structural view of a constant-temperature and variable-temperature cavity under five-stage lengthening.
FIG. 5 is a schematic structural view of a 4-stage thermostatic chamber. (a) Is a colored drawing with edges; (b) is a perspective view.
FIG. 6 is a schematic structural view of a 0-stage thermostatic chamber.
Fig. 7 is a schematic structural assembly diagram of the optical fiber clamping block 1. (a) Is a schematic view of an optical fiber clamping block 1; (b) is a schematic view of an optical fiber threading slot; (c) a schematic diagram of a state to be assembled; (d) the assembly is completed schematically.
Fig. 8 is a schematic structural assembly diagram of the optical fiber clamping block 2. (a) Is a schematic view of the optical fiber clamping block 2; (b) is a schematic view of an optical fiber threading slot; (c) is a schematic diagram of a state to be assembled; (d) the assembly is completed.
Fig. 9 is a schematic structural view of the thermal insulation door. (a) Is a perspective view of the insulation door under the non-lengthened condition; (b) the colored drawing is a colored drawing of the edge of the lengthened heat preservation door; (c) an isometric view of the insulated door under extension.
FIG. 10 is a schematic view of a main frame door panel. (a) Is a colored drawing with edges; (b) is a perspective view.
Fig. 11 is a schematic structural view of an extended 3-stage and 4-stage retractable door panel. (a) Is a colored drawing with edges; (b) is a perspective view.
Fig. 12 is a schematic structural view of a 0-level retractable door panel. (a) Is a colored drawing with edges; (b) is a perspective view.
FIG. 13 is a schematic view of an elongated class 4 and class 5 inner door skin construction. (a) Is a colored drawing with edges; (b) is a perspective view.
Fig. 14 is a schematic structural view of the micro-displacement mechanism.
FIG. 15 is a schematic structural view of a thermostatic chamber temperature sensor.
FIG. 16 is a schematic diagram of a fixed end fiber clamp configuration.
FIG. 17 is a schematic representation of important tolerance dimensional requirements for a fiber clamp.
FIG. 18 is a schematic structural view of an oil bath temperature varying tank. (a) Is a colored drawing with edges; (b) is a perspective view.
Fig. 19 is a flow chart of a working method of the automatic testing system for the brillouin intensity and the frequency shift strain temperature coefficient.
Fig. 20 is a schematic flow chart of the optical fiber strain temperature coefficient test platform for laying the temperature coefficient measured optical fiber and the strain coefficient measured optical fiber.
Fig. 21 is a schematic distribution diagram of the temperature coefficient measured optical fiber and the strain coefficient measured optical fiber.
FIG. 22 is a schematic diagram of the functional flow of automatic positioning of TFUT and SFUT optical fibers.
FIG. 23 is a schematic view of the functional flow of automatic testing and analysis of the strain coefficient and the temperature coefficient.
FIG. 24 is a flow chart of a single test function of the test system.
FIG. 25 is a flow chart illustrating the SFUT fiber optic self-alignment function.
FIG. 26 is a flow chart illustrating the TFUT fiber optic self-alignment function.
Fig. 27 is a functional diagram illustrating an automatic control function of the critical strain state of the fiber SFUT with a measured strain coefficient.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
as shown in FIG. 1, an automatic testing system for Brillouin intensity and frequency shift strain temperature coefficient comprises a computer system 1, a first pulse modulation control module 2, a 1310nm laser 3, a first 9:1 coupler 4, a 1310nm pulse modulation module 5, a 1310nm Raman amplifier 6, a 1310nm optical circulator 7, a 1310nm polarization scrambler 8, a first O/E module 9, a first mixer 10, a first local oscillator module 11, a first 1:1 coupler 12, a first filter 13, a first high-speed acquisition module 14, a second high-speed acquisition module 15, a second O/E module 16, a first optical filter 17, a second 1:1 coupler 18, a second pulse modulation control module 19, a 1550nm laser 20, a second 9:1 coupler 21, a 1550nm pulse modulation module 22, a 1550nm Raman amplifier 23, a 1550nm optical circulator 24, a 1550nm polarization scrambler 25, a third 1:1 coupler 26, A third O/E module 27, a second mixer 28, a second local oscillator module 29, and a second filter 30; 31-a third high-speed acquisition module 31, a fourth high-speed acquisition module 32, a fourth O/E module 33, a second optical filter 34, a fourth 1:1 coupler 35, a 1310nm/1550nm wavelength division multiplexer 36, a measured optical fiber 37 and an optical fiber strain temperature coefficient test platform 38.
The computer system 1 is respectively connected with a first pulse modulation control module 2, a 1310nm laser 3, a first local oscillator module 4, a first high-speed acquisition module 14, a second high-speed acquisition module 15, a second pulse modulation control module 19, a 1550nm laser 20, a second local oscillator module 29, a third high-speed acquisition module 31 and a fourth high-speed acquisition module 32 through circuits;
the pulse modulation control module 2 modulates the detection pulse by controlling the 1310nm pulse modulation module 5;
the first ends of the pulse modulation control module 2, the 1310nm pulse modulation module 5, the 1310nm Raman amplifier 6 and the 1310nm optical circulator 7 are sequentially connected through a line; the second end of the 1310nm optical circulator 7 is connected with the first 50% input end of the second 1:1 coupler 18 through a line; the third end of the 1310nm optical circulator 7 is connected with a 1310nm interface of the 1310nm/1550nm wavelength division multiplexer 36 through a line;
the 1310nm laser 3 and the first 9:1 coupler 4 are connected through a line;
the first 9:1 coupler 4, 90% of the output end of which is connected with the 1310nm pulse modulation module 5, and 10% of the output end of which is connected with one end of the 8-1310nm polarization scrambler module;
the other end of the 1310nm polarization scrambler 8 is connected with a first 50% input end of the first 1:1 coupler 12 through a line;
a first 50% output end of the first 1:1 coupler 12, a first O/E module 9, a first frequency mixer 10 and a first local oscillator module 11 are connected through a line; the second 50% input of the first 1:1 coupler 12 is connected to the first 50% output of the second 1:1 coupler 18 by a line;
the first mixer 10, the first filter 13 and the first high-speed acquisition module 14 are connected through a line;
the second high-speed acquisition module 15, the second O/E module 16, the first optical filter 17 and the second 50% output end of the second 1:1 coupler 18 are connected through a line;
the first ends of the second pulse modulation control module 19, the 1550nm pulse modulation module 22, the 1550nm Raman amplifier 23 and the 1550nm optical circulator 24 are connected in sequence through a circuit;
the second end of the 1550nm optical circulator 24 is connected with the 1550nm interface of the 1310nm/1550nm wavelength division multiplexer 46 through a line; the COM interface of the 1310nm/1550nm wavelength division multiplexer 36 is connected with the measured optical fiber 37;
the third end of the 1550nm optical circulator 24 is connected with the first 50% input end of the fourth 1:1 coupler 34 through a line;
the 1550nm laser 20 and the first input end of the second 9:1 coupler 21 are connected through a line;
a second 9:1 coupler 21, of which 90% output end is connected with the 1550nm pulse modulation module 22 and 10% output end is connected with one end of the 1550nm polarization scrambler 25 through a line;
the other end of the 1550nm polarization scrambler 25 is connected with the first 50% input end of the third 1:1 coupler 26 through a line;
the first 50% output end of the third 1:1 coupler 26, the third O/E module 27, the second mixer 28, and the second local oscillation module 29 are connected by a line;
the second 50% input of the third 1:1 coupler 26 and the first 50% output of the fourth 1:1 coupler 35 are connected by a line;
the second mixer 28, the second filter 30 and the third high-speed acquisition module 31 are connected through a line;
the fourth high-speed acquisition module 32, the fourth O/E module 33, the second optical filter 34, and the second 50% output end of the fourth 1:1 coupler 35 are connected by a line.
The structural schematic diagram of the optical fiber strain temperature coefficient test platform 38 of the invention is shown in fig. 2 and fig. 3, an oil bath temperature-variable cavity and a telescopic constant temperature cavity are arranged in the test platform for realizing uniform heating and constant temperature stretching of the measured optical fiber 37, the structural size of the platform under non-extension is 915x360x375 (length x width x height, unit: mm), and the structural size of the platform under 5-level extension is 1815x360x375 (length x width x height, unit: mm).
The oil bath temperature change cavity can realize uniform temperature rise change within the range of 30-120 ℃, the temperature control precision is 0.5-1 ℃, 2.8L of oil can be stored, and the uniform heating of the optical fiber with the length of 20m can be realized, so that two temperature change coefficients related to the Brillouin intensity and the frequency shift of the optical fiber under the stress-free state can be measured.
The resistance wire heating system and the air-conditioning refrigeration system are arranged in the telescopic constant-temperature cavity, so that the constant requirement of any temperature in the range of 5-25 ℃ can be realized, and the constant-temperature precision is 0.2-0.5 ℃. The length of the thermostat box body can be adjusted according to the requirement, and the optical fiber tensile test under different length requirements is met. The typical level of length adjustment of the invention is 5-level adjustment lengthening, and 3-6 levels of adjustment are recommended. The length of each stage of adjustment is equal, the typical length value is 180mm, namely the length size increase of 900mm can be realized by 5 stages of adjustment, and the size range of single stage adjustment is recommended to be 150 mm-300 mm. The optical fiber clamp and the micro-displacement stretching mechanism are arranged in the telescopic constant-temperature cavity, so that constant-temperature stretching tests of five optical fiber lengths (180mm, 360mm, 540mm, 720mm and 900mm) can be realized, and two stress change coefficients related to optical fiber Brillouin strength and frequency shift in a constant-temperature state can be measured.
The general structure of the optical fiber strain temperature coefficient test platform is described as follows:
the optical fiber strain temperature coefficient testing platform (38) comprises a general communication interface (38-1), a constant-temperature and variable-temperature box body (38-2), a first optical fiber clamping block (38-3), a second optical fiber clamping block (38-4), a heat preservation door (38-5), a first folding shell (38-6), a second folding shell (38-7), a universal wheel (38-8), a micro-displacement mechanism (38-9), a constant-temperature cavity temperature sensor (38-10), a fixed end optical fiber clamp (38-11), an oil bath box locking mechanism (38-12) and an oil bath variable-temperature box (38-13);
general communication interface (38-1): the system is a general communication interface for controlling the work of a test platform by an external computer system (1), sends communication commands including heating, heat preservation, refrigeration and stretching, and returns test data of a temperature sensor;
constant temperature-variable temperature box (38-2): the optical fiber strain temperature coefficient test platform is a main structure of the optical fiber strain temperature coefficient test platform; detailed description fig. 4 is detailed;
first fiber clamping block (38-3): is the entrance of the tested optical fiber (37) into the test platform; detailed description see fig. 7 for a detailed explanation;
second fiber clamping block (38-4): the measured optical fiber (37) enters the inlet of the telescopic constant temperature cavity from the oil bath variable temperature cavity; detailed description fig. 8 is detailed;
thermal insulating door (38-5): the door plate is a door plate of a constant temperature-variable temperature box body (38-2) and is used for reducing heat loss of an oil bath temperature-variable cavity and a stretching constant temperature cavity in the working process; detailed description see fig. 9 for details;
first folded housing (38-6): the test platform has the functions of ensuring the appearance integrity of the test platform and isolating the air flow between the 0-5 level constant temperature cavity and the external environment as far as possible; the folding and stretching of the shell is achieved by soft plastic or leather, with a typical thickness of 1.5mm, with a recommended thickness range of 1-2 mm;
second folded housing (38-7): the test platform has the functions of ensuring the appearance integrity of the test platform and isolating the air flow between the 0-5 level frame door panel and the external environment as far as possible; the shell is folded and stretched by soft plastics or leather and other materials, the typical thickness value is 1.5mm, and the recommended thickness range is 1-2 mm;
universal wheel (38-8): the number of the constant-temperature and variable-temperature box bodies (38-2) is 6, and the locking function is provided, so that the test platform is convenient to transfer and transport;
micro-displacement mechanism (38-9): the optical fiber stretching device is used for stretching the optical fiber at the stretching end in the constant-temperature cavity; detailed description fig. 14 is detailed;
oven temperature sensor (38-10): temperature measurement feedback for the optical fiber in the stretching constant temperature cavity; detailed description see fig. 15 for a detailed explanation;
fixed end fiber clamp (38-11): the optical fiber fixing device is used for fixing an optical fiber at the fixed end in the stretching constant temperature cavity; detailed description see fig. 16 for details;
oil bath tank locking mechanism (38-12): the oil bath temperature changing box is used for ensuring the position of the oil bath temperature changing box in the temperature changing cavity to be fixed;
oil bath variable temperature box (38-13): the coiling optical fiber heating device is used for placing coiled optical fibers in an unstressed state, and is internally provided with an oil material and a resistance wire heating system which can heat the oil material. Detailed description fig. 18 is detailed.
The structure of the constant temperature-variable temperature box body (38-2) is shown in figure 4, and the details are as follows:
the constant-temperature and variable-temperature box body (38-2) comprises an oil bath temperature-variable cavity (38-2-1), a 5-level constant-temperature cavity (38-2-2), a 4-level constant-temperature cavity (38-2-3), a 3-level constant-temperature cavity (38-2-4), a 2-level constant-temperature cavity (38-2-5), a 1-level constant-temperature cavity (38-2-6) and a 0-level constant-temperature cavity (38-2-7); (38-2-2) - (38-2-7) are 6 constant temperature intercommunicating cavities;
oil bath temperature-variable cavity (38-2-1): a detachable oil bath temperature changing box (38-13) is arranged;
6 constant temperature intercommunicating cavities (38-2-2) - (38-2-7) for placing a micro-displacement mechanism for stretching the measured optical fiber (37) and a related clamp;
5-stage thermostatic chamber (38-2-2): the device is used for placing a fixed end optical fiber clamp (38-11), and is provided with 2 resistance wire heating devices (38-2-2-1), 4 sliding rails (38-2-2-2), 2 clamping plates (38-2-2-3) and 8 magnet pieces (38-2-2-4); the sizes and the layouts of the resistance wire heating device (38-2-2-1), the slide rail (38-2-2-2), the clamping plate (38-2-2-3) and the magnet piece (38-2-2-4) are consistent with those of the 4-level thermostatic cavity (38-2-3);
4-stage thermostatic chamber (38-2-3): 2 resistance wire heating devices (38-2-3-1), a limit switch group (38-2-3-2) (comprising 4 limit switches), 4 sliding rails (38-2-3-3), 2 clamping plates (38-2-4-4) and 8 magnet pieces (38-2-3-5) are designed; (ii) a
The limit switch group (38-2-3-2) comprises 4 limit switches;
3-level thermostatic chamber (38-2-4): 2 resistance wire heating devices (38-2-4-1), a limit switch group (38-2-4-2), 4 sliding rails (38-2-4-3), 2 clamping plates (38-2-4-4) and 8 magnet pieces (38-2-4-5) are designed; the sizes and the layouts of the resistance wire heating device (38-2-4-1), the limit switch group (38-2-4-2), the sliding rail (38-2-4-3), the clamping plate (38-2-4-4) and the magnet piece (38-2-4-5) are consistent with those of the 4-level thermostatic cavity (38-2-3);
the limit switch group (38-2-4-2) comprises 4 limit switches;
level 2 thermostatic chamber (38-2-5): 2 resistance wire heating devices (38-2-5-1), a limit switch group (38-2-5-2) (comprising 4 limit switches), 4 sliding rails (38-2-5-3), 2 clamping plates (38-2-5-4) and 8 magnet pieces (38-2-5-5) are designed; the sizes and the layouts of the resistance wire heating device (38-2-5-1), the limit switch group (38-2-5-2), the sliding rail (38-2-5-3), the clamping plate (38-2-5-4) and the magnet piece (38-2-5-5) are consistent with those of the 4-level thermostatic cavity (38-2-3) (38-2-3);
the limit switch group (38-2-5-2) comprises 4 limit switches;
level 1 thermostatic chamber (38-2-6): 2 resistance wire heating devices (38-2-6-1), a limit switch group (38-2-6-2), 4 sliding rails (38-2-6-3), 2 clamping plates (38-2-6-4) and 8 magnet pieces (38-2-6-5) are designed; the sizes and the layouts of the resistance wire heating device (38-2-6-1), the limit switch group (38-2-6-2), the sliding rail (38-2-6-3), the clamping plate (38-2-6-4) and the magnet piece (38-2-6-5) are consistent with those of the 4-level thermostatic cavity (38-2-3);
level 0 oven chamber (38-2-7): an air-conditioning refrigeration system (38-2-7-1), a resistance wire heating device (38-2-7-2) at 1 position and 4 limit switch groups (38-2-7-3) are designed. (ii) a The detailed description is illustrated in fig. 6.
The structure of the 4-level thermostatic chamber (38-2-3) in the invention is shown in figure 5, and the details are as follows:
4 level thermostatic chamber (38-2-3), including following structure:
resistance wire heating device (38-2-3-1): 2 positions in total, 1 position of each of the top surface and the bottom surface has no bulge, and whether the heating is carried out is controlled by an external computer;
limit switch (38-2-3-2): the number of the top surface and the bottom surface is 2 respectively, the top surface and the bottom surface can move in a sliding rail (38-2-2-2) of a 5-level thermostatic chamber (38-2-2), the two ends of the sliding rail are limited, and meanwhile, the information that the limit switch (38-2-3-2) reaches the two ends of the sliding rail (38-2-2-2) is informed to an external computer system;
slide rail (38-2-3-3): the number of the limit switches is 4, the limit switches correspond to the positions of the limit switches (38-2-4-2) of the 3-level thermostatic chamber (38-2-4), and a guiding effect is provided for the 3-level thermostatic chamber (38-2-4);
chucking plate (38-2-3-4): the upper and lower clamping sheets are totally embedded in side grooves of the level-4 constant temperature cavity (38-2-3) when the level-3 constant temperature cavity (38-2-4) is in an unstretched state, and the depth of the grooves is the same as the thickness of the clamping sheets; when the 3-level thermostatic chamber (38-2-4) is stretched and lengthened to a proper position, the clamping plate (38-2-3-4) is placed in the grooves on the top surface and the bottom surface, and the depth of the groove is 4-10 mm smaller than the thickness of the clamping plate, so that the 3-level thermostatic chamber (38-2-4) and the 4-level thermostatic chamber (38-2-3) can not move relatively in the stretching process of the optical fiber;
(38-2-3-5) magnet piece: the number of the clamping plates is 8, 1 is respectively arranged on the top surface groove and the bottom surface groove, 2 is arranged on the side surface groove, and 1 is respectively arranged on the front surface and the back surface of the two clamping plates (38-2-3-4); when the clamping plates (38-2-3-4) are arranged in the top surface groove, the bottom surface groove and the side surface groove, the clamping plates can be sucked by the corresponding magnet sheets to play a certain fixing role.
The structure of the 0-level thermostatic chamber (38-2-7) in the invention is shown in figure 6, and the details are as follows:
a level 0 thermostatic chamber (38-2-7) comprising the following structure:
air-conditioning refrigeration system (38-2-7-1): when the temperature in the stretching constant-temperature cavity is higher than a set value, the refrigerating system is started to reduce the temperature in the cavity;
resistance wire heating device (38-2-7-2): because the micro-displacement mechanism (38-9) is arranged on the bottom surface of the level 0 thermostatic cavity (38-2-7), only 1 group of heating devices positioned on the top surface of the cavity body is designed.
A limit switch group (38-2-7-3): the total number of the groups is 4, and the layout is the same as that of the limit switch group (38-2-3-2).
The structure of the first fiber clamping block (38-3) in the present invention is shown in fig. 7(a) and (b), and is detailed as follows:
a first fiber clamping block (38-3) comprising the following structure:
handle (38-3-1): the first optical fiber clamping block (38-3) is convenient to detach and insert;
fiber-passing groove (38-3-2): the semicircular groove structure is used for placing the optical fiber (37) to be detected and preventing the first optical fiber clamping block (38-3) from extruding the optical fiber (37) to be detected when being inserted into the constant-temperature and variable-temperature box body (38-2);
the first fiber clamping block (38-3) is structurally assembled as follows:
firstly, putting an optical fiber into an optical fiber penetrating groove, then inserting a first optical fiber clamping block (38-3) into a constant temperature-variable temperature box body (38-2), wherein the corresponding part of the constant temperature-variable temperature box body (38-2) adopts a dovetail groove-shaped matching structure, and the heat exchange between an oil bath temperature-variable cavity (38-2-1) and the outside is reduced as much as possible; the part of the tested optical fiber (37) contacting with the optical fiber insertion slot (38-3-2) is wrapped by asbestos and foam soft materials to reduce the air flow at the position of the optical fiber insertion slot.
The second fiber clamping block (38-4) of the present invention is constructed as shown in FIGS. 8(a) and 8(b), in detail as follows:
a second fiber clamping block (38-4) comprising the following structure:
handle (38-4-1): the second optical fiber clamping block (38-4) is convenient to detach and insert;
fiber-passing groove (38-4-2): the semicircular groove structure is used for placing the optical fiber (37) to be detected and preventing the second optical fiber clamping block (38-4) from being extruded to the optical fiber (37) to be detected when being inserted into the constant-temperature and variable-temperature box body (38-2);
the structure of the second fiber clamping block (38-4) is assembled as follows:
firstly, putting an optical fiber into an optical fiber penetrating groove, then inserting a second optical fiber clamping block (38-4) into a constant temperature-variable temperature box body (38-2), and reducing heat exchange between an oil bath temperature-variable cavity (38-2-1) and stretching constant temperature cavities (38-2-2) - (38-2-7) as far as possible by adopting a step-shaped matching structure; the part of the optical fiber, which is contacted with the optical fiber insertion groove, is wrapped by asbestos and foam soft materials so as to reduce the air flow at the position of the optical fiber insertion groove; the section also defines an entrance chamfer to facilitate insertion of the second fiber clamping block (38-4).
The structure of the heat preservation door (38-5) in the invention is shown in figure 9, and the details are as follows:
thermal insulation door (38-5) includes following structure:
main frame door panel (38-5-1): the oil bath temperature-changing cavity (38-2-1) is used for sealing the oil bath temperature-changing cavity, and is also used for placing a frame door plate assembly and an inner core door plate assembly which are not pulled out, and 2 sliding rails (38-5-1-1) are arranged in the oil bath temperature-changing cavity; detailed description see fig. 10 for details;
4-level retractable door panel (38-5-2): belongs to a frame door plate component and is provided with 2 sliding rails (38-5-2-1) and 2 limiting blocks (38-5-2-2); can slide in a straight line in the sliding rail (38-5-1-1) and is limited by a limit block (38-5-2-2); detailed description see fig. 11 for a detailed explanation;
3-level retractable door panel (38-5-3): belongs to a frame door plate component and is provided with 2 sliding rails (38-5-3-1) and 2 limiting blocks (38-5-3-2); can slide in a straight line in the sliding rail (38-5-2-1) and is limited by a limit block (38-5-3-2); detailed description see fig. 11 for a detailed explanation;
2-stage retractable door panel (38-5-4): belongs to a frame door plate component and is provided with 2 sliding rails (38-5-4-1) and 2 limiting blocks (38-5-4-2); can slide in a straight line in the sliding rail (38-5-3-1) and is limited by a limit block (38-5-4-2); the size distribution of the sliding rail (38-5-4-1) and the limiting block (38-5-4-2) is consistent with that of the 4-level telescopic door panel (38-5-2);
level 1 retractable door panel (38-5-5): belongs to a frame door plate component and is provided with 2 sliding rails (38-5-5-1) and 2 limiting blocks (38-5-5-2); can slide in a straight line in the sliding rail (38-5-4-1) and is limited by a limit block (38-5-5-2); the size distribution of the sliding rail (38-5-5-1) and the limiting block (38-5-5-2) is consistent with that of the 4-level telescopic door panel (38-5-2);
0-level retractable door panel (38-5-6): 2 limit blocks (38-5-6-2) are designed; can slide in a straight line in the sliding rail (38-5-5-1) and is limited by a limit block (38-5-6-2); detailed description see fig. 12 for a detailed explanation;
level 5 inner core door panel (38-5-7): belongs to an inner core door plate component, and is provided with 2 sliding rails (38-5-7-1) and 2 limiting blocks (38-5-7-2); can slide in a straight line in the sliding rail (38-5-1-2) and is limited by a limit block (38-5-7-2); detailed description see fig. 13 for a detailed explanation;
level 4 inner core door panel (38-5-8): belongs to an inner core door plate component, 2 sliding rails (38-5-8-1) and 2 limiting blocks (38-5-8-2) are designed; can slide in a straight line in the sliding rail (38-5-7-1) and is limited by a limit block (38-5-8-2); detailed description see fig. 13 for a detailed explanation;
level 3 inner core door panel (38-5-9): belongs to an inner core door plate component, and is provided with 2 sliding rails (38-5-9-1) and 2 limiting blocks (38-5-9-2); can slide in the sliding rail (38-5-8-1) in a straight line, and is limited by a limit block (38-5-9-2); the size layout of the sliding rail (38-5-9-1) and the limiting block (38-5-9-2) is consistent with that of the 4-level inner core door panel (38-5-8);
level 2 inner core door panels (38-5-10): belongs to an inner core door plate component, and is provided with 2 sliding rails (38-5-10-1) and 2 limiting blocks (38-5-10-2); can slide in a straight line in the sliding rail (38-5-9-1) and is limited by a limit block (38-5-10-2); the size layout of the sliding rail (38-5-10-1) and the limiting block (38-5-10-2) is consistent with that of the 4-level inner core door panel (38-5-8);
level 1 inner core door panel (38-5-11): belongs to an inner core door plate component and is provided with 2 limit blocks (38-5-11-1); can slide in a straight line in the sliding rail (38-5-10-1) and is limited by a limit block (38-5-11-1); the size distribution of the limiting block (38-5-11-1) is consistent with that of a 4-level inner core door plate (38-5-8);
hinge (38-5-12): the heat preservation door (38-5) is connected with the constant-temperature and variable-temperature box body (38-2) through 3-5 hinges, so that the door can be opened and closed; the contact part after closing the door is made of soft materials such as rubber or is of a step-shaped structure, so that air flow at the gap is reduced as much as possible; wherein the 0-level telescopic door panel (38-5-2) is connected with the 0-level thermostatic chamber (38-2-7) by at least 1 hinge;
door handle (38-5-13): the heat preservation door (38-5) is convenient to open and close;
when the 5-level constant temperature cavities sequentially extend from 0 to 5 levels, the 0-level telescopic door panel (38-5-2) and the frame door panel component synchronously extend one by one according to the 0 to 5-level sequence;
when the 1-level telescopic door plate is stretched, the 1-level inner core door plate can be synchronously pulled out.
The structure of the main frame door panel (38-5-1) of the present invention is shown in fig. 10, and is detailed as follows:
the main frame door panel (38-5-1) comprises the following structures:
a slide rail (38-5-1-1); corresponding to the limiting block (38-5-2-2), the guiding function is provided for the 4-level telescopic door panel (38-5-2);
slide rail (38-5-1-2): corresponding to the limiting block (38-5-7-2), the guiding function is provided for the 5-level inner core door plate (38-5-7);
the structures of the 4-level retractable door panel (38-5-2) and the 3-level retractable door panel (38-5-3) are shown in FIG. 11, and are detailed as follows:
a 4-level telescopic door panel (38-5-2); the structure comprises the following structures:
slide rail (38-5-2-1): corresponding to the limiting block (38-5-3-2), the guiding function is provided for the 3-level telescopic door panel (38-5-3);
a limiting block (38-5-2-2): limiting the moving position of the 4-stage telescopic door panel (38-5-2);
a 3-level telescopic door panel (38-5-3); the structure comprises the following structures:
slide rail (38-5-3-1): corresponding to the limiting block (38-5-4-2), the guiding function is provided for the 2-level telescopic door panel (38-5-4);
a limiting block (38-5-3-2): limiting the moving position of the 3-level telescopic door panel (38-5-3);
the structure of the 0-level telescopic door panel (38-5-6) in the invention is shown in figure 12, and the details are as follows:
0 level telescopic door panel (38-5-6), including following structure:
a limiting block (38-5-6-1): can move in the sliding rail (38-5-5-1) to limit the moving position of the 0-level telescopic door panel (38-5-6);
the structures of the class 5 inner core door panels (38-5-7) and the class 4 inner core door panels (38-5-8) of the present invention are shown in fig. 13, and are detailed as follows:
a class 5 inner core door panel (38-5-7) comprising the following structure:
slide rail (38-5-7-1): corresponding to the limiting block (38-5-8-2), the guiding function is provided for the 4-level inner core door plate (38-5-8);
a limiting block (38-5-7-2): limiting the movement position of the class 5 inner core door panel (38-5-7);
a class 4 inner core door panel (38-5-8) comprising the following structure:
slide rail (38-5-8-1): corresponding to the limiting block (38-5-9-2), the guiding function is provided for the 3-level inner core door plate (38-5-9);
a limiting block (38-5-8-2): limiting the movement position of the 4-stage inner core door panel (38-5-8);
the structure of the micro-displacement mechanism (38-9) of the present invention is shown in fig. 14, and is detailed as follows:
micro-displacement mechanism (38-9) comprising the steps of:
servo control interface (38-9-1): is a communication interface for controlling the movement of the micro-displacement mechanism by an external computing system (1);
servo motor (38-9-2): the high-precision rotation variation can be generated;
coupling, screw (38-9-3): converting the rotation variation generated by the servo motor (38-9-2) into the linear displacement variation of the optical fiber clamp (38-9-4) at the stretching end;
draw end fiber clamp (38-9-4): a measured optical fiber (37) for fixing the stretching end;
screw (38-9-5): fixing a micro-displacement mechanism (38-9) on a 0-level constant-temperature cavity (38-2-7);
the micro-displacement mechanism (38-9) is fixed on the 0-level constant temperature cavity (38-2-7) through a screw (38-9-5), the servo motor (38-9-2) is controlled to rotate by the external computer system (1) through the servo control interface (38-9-1), and the rotation variation of the servo motor (38-9-2) is converted into the linear displacement variation of the optical fiber clamp (38-9-4) at the stretching end through the coupler and the screw (38-9-3);
the typical displacement stroke value of the micro-displacement mechanism (38-9) is 200mm, the stroke range is 150-300 mm, and the positioning precision is 1-3 mu m;
in the micro-displacement mechanism (38-9), the optical fiber clamp (38-9-4) at the stretching end moves towards the direction of the servo motor (38-9-2) to reduce the displacement and increase the optical fiber strain; movement in the opposite direction to the servo motor (38-9-2) is an increase in displacement and a decrease in fiber strain.
The structure of the thermostatic chamber temperature sensor (38-10) in the invention is shown in figure 13, and the details are as follows:
thermostatic chamber temperature sensor (38-10) comprising the following structure:
support bar (38-10-1): the tail part of the constant temperature cavity is fixed on the side walls of the 0-level and 5-level constant temperature cavities, and the middle part of the constant temperature cavity can be bent randomly; the tail part of the supporting rod can be additionally provided with a telescopic structure;
temperature-sensitive element (38-10-2): a Pt100 temperature sensor is selected.
The structure of the fixed end fiber clamp (38-11) of the present invention is shown in FIG. 16, in detail as follows;
a fixed end fiber clamp (38-11) comprising the following structure:
base (38-11-1): the bearing pressing plate (38-11-2) is used for pressing and fixing the tested optical fiber (37); metal alloys such as hard aluminum (the brand 2A12) are recommended to be selected, so that the fixed end clamp and the micro-displacement mechanism do not have relative displacement in the stretching process; the roughness of the contact surface with the platen (38-11-2) is as small as possible, and the roughness Ra value should be less than 1.6 μm, as shown in FIG. 17;
pressing plate (38-11-2): the device is used for pressing and fixing the tested optical fiber (37); materials with larger friction force such as rubber are recommended to be selected, so that the optical fiber is ensured to be subjected to enough friction force and as small as possible shearing force in the process of stretching; the roughness of the contact surface with the base (38-11-1) is as small as possible, and the roughness Ra value should be lower than 1.6 microns, as shown in FIG. 17;
a handle (38-11-3);
screw (38-11-4): is used for fixing the pressure plate (38-11-2) and the base (38-11-1);
platen fiber holes (38-11-5): the diameter of the hole contacted with the measured optical fiber (37) has a negative tolerance with the diameter of the measured optical fiber (37), and the negative tolerance range of the diameter is phi-0.01 mm to-0.05 mm; as shown in fig. 17;
base fiber hole (38-11-6): the diameter of the hole contacted with the measured optical fiber (37) has a negative tolerance with the diameter of the measured optical fiber (37), and the negative tolerance range of the diameter is phi-0.01 mm to-0.05 mm; as shown in fig. 17;
the upper surface of the base (38-11-1) needs to be designed with a sinking surface, the pressing plate (38-11-2) is guaranteed to be sunk and placed on the basis of the sinking surface, the sinking surface of the base (38-11-1) and the corresponding surface of the pressing plate (38-11-2) guarantee that the verticality tolerance of the reference surface A, B is less than 0.01mm, the distances between the two surfaces and the centers of the semicircular holes of the optical fibers are strictly consistent, and the distance tolerance requirement is less than 5 mu m, as shown in FIG. 17. The contact length of the clamp and the optical fiber should be more than 100mm, that is, the depth of the two semicircular holes should be more than 100mm, so as to ensure a sufficient contact area between the clamp and the optical fiber.
The structure of the oil bath incubator of the present invention (38-13) is shown in FIG. 18, and details are as follows:
an oil bath incubator (38-13) comprising the following structure:
oil bath case housing (38-13-1): is the main structure of the oil bath temperature changing box (38-13);
control interface (38-13-2): is a control interface for controlling the temperature change of the oil bath tank by an external computer;
main hole (38-13-3): the tested optical fiber (37) is used for pouring oil and putting the oil into a coil; the typical diameter value of the main hole (38-13-3) is 270mm, and the diameter range is 250-300 mm;
main cover (38-13-4): the screw thread sealing structure is used for sealing the main hole;
rubber cover (38-13-5): the small hole (38-13-6) is used for sealing the small hole (38-13-6) and is only used before the optical fiber (37) to be tested is placed, and the small hole (38-13-6) is in an open state in the formal working process;
orifice (38-13-6): the part of the tested optical fiber (37) which is used for being placed in and out of the oil bath temperature-changing box (38-13) in the temperature-changing test working process; the typical diameter value of the small hole (38-13-6) is 10mm, and the diameter size range is 3-15 mm;
intersecting pore gap (38-13-7): is a gap formed by the intersection of the main hole (38-13-3) and the small hole (38-13-6); after the coiled optical fiber (37) to be detected is placed into the main hole (38-13-3), the two ends of the optical fiber enter the small hole (38-13-6) from the intersection hole gap (38-13-7); the typical value of the size of the alloy is 2-5 mm;
temperature sensor No. 1 (38-13-8): for measuring the temperature at the central position of the perforated partition (38-13-15);
temperature sensor No. 2 (38-13-9): for measuring the temperature of one corner of the perforated partition (38-13-15);
temperature sensor No. 3 (38-13-10): for measuring the temperature of one corner of the perforated partition (38-13-15);
temperature sensor No. 4 (38-13-11): for measuring the temperature of one corner of the perforated partition (38-13-15);
temperature sensor No. 5 (38-13-12): for measuring the temperature of one corner of the perforated partition (38-13-15);
the No. 1-5 temperature sensors are distributed in the center and 4 corner positions of the partition plate with the holes, temperature data of the five points are measured, and the computer can accurately calculate the temperature of the temperature field of the measured optical fiber by acquiring and processing the data in real time;
temperature sensor No. 6 (38-13-13): the device is used for measuring the output temperature of the heating resistance wire, accurately adjusting the temperature change of the oil bath temperature change box, and simultaneously monitoring the working state of the heating resistance wire to prevent high-temperature damage;
resistance wire heating device (38-13-14): heating the oil, and controlling the heating power of the oil by an external computer system;
perforated partition (38-13-15): the device is used for placing the measured optical fiber in the temperature-varying test process, an aluminum alloy material is used, the typical diameter size of the hole in the partition plate is 15mm, and the diameter size range is 10-25 mm;
a handle (38-13-16);
oil change ports (38-13-17): the outlet of the oil is replaced.
The flow of the automatic testing method for the Brillouin strength and the frequency shift strain temperature coefficient is shown in FIG. 19, and the specific steps are as follows:
step 101: the computer system (1) carries out self-inspection on the automatic testing system of the Brillouin intensity and the frequency shift strain temperature coefficient;
step 102: judging whether the self-checking passes, if so, performing step 103, and if not, performing step 104;
step 103: displaying and outputting an error prompt to wait for processing;
step 104: putting the tested optical fiber into an optical fiber strain temperature coefficient test platform (38), wherein a part of the optical fiber with the length of TLV is put into an oil bath temperature-variable box (38-13) to be used as the tested optical fiber with the temperature coefficient TFUT; one part of the fiber is fixed between a stretching end fiber clamp (38-9-4) and a fixed end fiber clamp (38-11) in a tensioned state and is used as a strain coefficient tested fiber SFUT;
step 105: setting the optical fiber length FL, sampling resolution SR parameters, test starting frequency FS, test ending frequency FE, test frequency interval FI, pulse width PW, accumulation times AT, 1310nm refractive INDEX INDEX13 and 1550nm refractive INDEX INDEX 15;
step 106: starting an automatic positioning function, acquiring the 1550nm position TPV15 and the 1310nm position TPV13 of a temperature coefficient tested optical fiber TFUT, and the 1550nm position SPV15 and the 1310nm position SPV13 of a strain coefficient tested optical fiber SFUT, and automatically controlling the movement of a micro-displacement structure (38-9) to enable the optical fiber to be in a critical strain state;
step 107: manually measuring the length SLV of an optical fiber strain acting area between a stretching end optical fiber clamp (38-9-4) and a fixed end optical fiber clamp (38-11);
step 108: inputting the length SLV of the optical fiber strain action area and the length TLV of the optical fiber temperature action area;
step 109: starting a coefficient automatic analysis function, and obtaining 1310 strength strain coefficient PS13 and 1310 strength temperature coefficient; PT13, 1310 frequency-shifted strain coefficient FS13, 1310 frequency-shifted temperature coefficient FT13, 1550 strength strain coefficient PS15, 1550 strength temperature coefficient PT15, 1550 frequency-shifted strain coefficient FS15, 1550 frequency-shifted temperature coefficient FT 15;
step 110: and displaying and outputting 1310 strength strain coefficient PS13, 1310 strength temperature coefficient PT13, 1310 frequency shift strain coefficient FS13, 1310 frequency shift temperature coefficient FT13, 1550 strength strain coefficient PS15, 1550 strength temperature coefficient PT15, 1550 frequency shift strain coefficient FS15 and 1550 frequency shift temperature coefficient FT15, and finishing the test process.
The process of arranging the temperature coefficient measured optical fiber and the strain coefficient measured optical fiber on the optical fiber strain temperature coefficient test platform in the invention is shown in fig. 20, and the specific steps are as follows:
step 201: dividing the tested optical fiber into 5 parts, namely an optical fiber access end external redundant optical fiber RYOFS with the length of RYFS, the typical value of which is 50m, the recommended length range is 20m < RYFS <5000m, the optical fiber is used for being placed outside an optical fiber strain temperature coefficient test platform (38), the temperature coefficient tested optical fiber TFUT with the length of TLV, the typical value of TLV is 10m, the recommended length range is 5m < TLV < 20m, the optical fiber is used for being placed in an oil bath temperature variation box (38-13), the strain coefficient tested optical fiber SFUT with the length of larger than SLV is used for being placed in an oil bath temperature variation box (38-2-7), the length range of the optical fiber SFUT with the length of 0.15m < SLV <1.2m, the optical fiber SFUT is used for being placed in a 5-level thermostatic chamber (38-2-2) -0-7), one side close to the TFUT is a fixed end, the other side is a stretching end, the optical fiber with the length of JG01, the typical value of the optical fiber is 1.5m, the recommended size range of JG01<3m, is the portion where the external redundant fiber is connected to the TFUT; an intracavity spacer fiber of length JG02, typically 0.8m, with recommended dimensions in the range of 0.6m < JG02<1.2m, being the part where TFUT and SFUT are connected and a fiber end external redundant fiber RYOFE of length RYFE, typically 20m, with recommended lengths in the range of 10m < RYFE <100m, for placement outside of the fiber strain temperature coefficient test platform (38); at the moment, the optical fiber strain temperature coefficient test platform (38) is in a non-lengthened state, and the heat preservation door (38-5) is in a closed state;
step 202: judging the number NJ of the constant temperature cavity stages needing to be pulled out according to the length SFUT of the stretched optical fiber, wherein the number NJ of the constant temperature cavity stages is initially assigned to be 0 as the 0-stage constant temperature cavity is pulled out firstly;
step 203: judging that (NJ +1) × 0.18 is not less than SFUT; "yes" goes to step 206, and "no" goes to step 204;
step 204: the NJ-level constant-temperature cavity is pulled out manually, the NJ-level telescopic door panel is pulled out, and after the NJ-level telescopic door panel is pulled out, the NJ-level corresponding limit switch (38-2-7-3) is automatically and simultaneously in an electrified opening state, wherein NJ is NJ + 1;
step 205: opening the clamping plate (38-2-6-4), clamping the NJ-level constant-temperature cavity, and performing step 203;
step 206: opening the heat preservation door (38-5), and enabling the door handle (38-5-13) to be supported on a supporting plane including the ground or the table top;
step 207: drawing out the first optical fiber clamping block (38-3) and the second optical fiber clamping block (38-4), and opening the main cover (38-13-4) and the rubber cover (38-13-5);
step 208: passing the temperature coefficient measured optical fiber TFUT with length TLV through the main hole (38-13-3) to be placed on the perforated partition plate (38-13-15) in a relaxed coiled state;
step 209: moving the extra-cavity spacing optical fiber with the length of JG01 and the intra-cavity spacing optical fiber with the length of JG02 into the small hole (38-13-6) from the intersection hole gap (38-13-7), and then placing and screwing the main cover (38-13-4) on the main hole (38-13-3);
step 210: penetrating an intracavity interval optical fiber with the length of JG02 from an optical fiber penetrating groove (38-4-2) into a stretching constant temperature cavity, and wrapping a part which is contacted with the optical fiber penetrating groove (38-4-2) by a little asbestos;
step 211: fixing the fixed end of the SUFT on a fixed end optical fiber clamp (38-11), namely unscrewing a screw (38-11-4), taking out a pressing plate (38-11-2), placing the fixed end of the SFUT in the base optical fiber hole (38-11-6), pressing the pressing plate (38-11-2) on the base (38-11-1) to ensure that the measured optical fiber corresponds to the pressing plate optical fiber hole (38-11-5), and screwing the screw (38-11-4);
step 212: moving a stretching end optical fiber clamp (38-9-4) to the total displacement middle position of a micro displacement mechanism (38-9), fixing the stretching end of the optical fiber SUFT with the strain coefficient to be measured on the stretching end optical fiber clamp (38-9-4), wherein the detailed steps are the same as the step 211, and simultaneously enabling the SUFT to be in a tense state as much as possible;
step 213: confirming that no bend radius of the intracavity spaced fiber of length JG02 below 0.05m is present, inserting a second fiber clamping block (38-4);
step 214: an extra-cavity interval optical fiber with the length of JG01 is penetrated through an optical fiber penetrating groove (38-3-2), and a part contacted with the optical fiber penetrating groove (38-4-2) is wrapped by a little asbestos;
step 215: confirming that no bend radius of the extra-cavity spacer fiber of length JG01 less than 0.05m is present, inserting a first fiber clamping block (38-3);
step 216: and closing the heat preservation door (38-5), and finishing the installation of the tested optical fiber (37).
Fig. 21 is a schematic distribution diagram of the temperature coefficient measured optical fiber and the strain coefficient measured optical fiber.
Fig. 22 shows a schematic flow chart of the automatic positioning function of the temperature coefficient measured optical fiber TFUT and the strain coefficient measured optical fiber SFUT, which includes the following specific steps:
step 301: reading related data of an optical fiber strain temperature coefficient test platform (38) through a communication interface (38-1), wherein the related data comprises opening state data LCKG [ 0-3 ] of a limit switch group (38-2-3-2), a limit switch group (38-2-4-2), a limit switch group (38-2-5-2), and limit switch group (38-2-6-2), single-stage extension length SCL, 5 th-stage constant temperature cavity length DJSCL5, 0 th-stage constant temperature cavity length DJSCL0, uniform temperature HWQ of 6 constant temperature intercommunicated cavities (38-2-2) - (38-2-7), and uniform temperature TYBWQ of an oil bath variable temperature cavity (38-2-1); calculating the total number of data 1 in the LCKG [ 0-3 ] as the number SCN of the elongation nodes of the thermostatic chamber,
step 302: calculating using constant temperature cavity length SCL ═ DJSCL0+ DJSCL5+ SCN ×. DJSCL, calculating single fiber draw FLSL ═ SCL 50 ×. 0.000001, if FLSL ≦ 10 μm then FLSL is 10 μm, setting single temperature change TSJW ═ 5 ℃;
step 303: calculating the SPV15 and SPV13 of the tested optical fiber SFUT at 1550nm and 1310 nm;
step 304: determine "return failure information? "," yes "goes to step 305, and" no "goes to step 306;
step 305: displaying failure information, and rechecking the optical fiber adhesion;
step 306: the temperature coefficient measured optical fiber TFUT is at 1550nm position TPV15 and 1310nm position TPV 13;
step 307: determine "return failure information? "," yes "goes to step 308, and" no "goes to step 309;
step 308: displaying failure information, and rechecking the optical fiber in the oil bath temperature change box (38-13);
step 309: automatically controlling the micro-displacement structure (38-9) to move to enable the optical fiber to be in a critical strain state;
step 310: and the function is finished and success information is returned.
The process of the automatic testing and analyzing function of the strain coefficient and the temperature coefficient in the invention is shown in fig. 23, and comprises the following specific steps:
step 401: reading the SPV15 and SPV13 at 1550nm and the SPV13 at 1310nm of the fiber SFUT, the TPV15 and TPV13 at 1550nm and the TYYBWQ at 1550nm and the uniform temperature of the oil bath temperature-changing cavity (38-2-1), and asking a user to input a displacement interval FLJG with a typical value of 200 mu epsilon SLV and rounding up with a unit of mu m; calculating the strain displacement number NN to be 5000/FLSL and rounding downwards; please the user to enter a temperature ramp interval TUSW, typically 5 ℃ and rounded up to a minimum of 2 ℃; calculating the temperature rise times MM ═ 120-TYBWQ)/TUSW and rounding downwards;
step 402: initializing 1310 strength strain coefficient temporary arrays DATAPS13[ 0-NN ], 1310 strength temperature coefficient temporary arrays DATAPT13[ 0-MM ], 1310 frequency shift strain coefficient temporary arrays DATAFS13[ 0-NN ], 1310 frequency shift temperature coefficient temporary arrays DATAFT13[ 0-MM ], 1550 strength strain coefficient temporary arrays DATAPS15[ 0-NN ], 1550 strength temperature coefficient temporary arrays DATAPT15[ 0-MM ], 1550 frequency shift strain coefficient temporary arrays DATAFS15[ 0-NN ], 1550 frequency shift temperature coefficient temporary arrays DATAFT15[ 0-MM ], temperature record arrays TCURR [ 0-MM ], strain record arrays SCURR [ 0-NN ] with all values of 0, and initializing variable J as 0;
step 403: starting a test system for single test, reading 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], 1310 Brillouin intensity data DATABPO13[ 0-N ], 1550 Brillouin intensity data DATABPO15[ 0-N ];
step 404: DATAPS13[ J ] ═ DATABPO13[ SPV13], DATAFS13[ J ] ═ DATACF13[ SPV13], DATAPS15[ J ] ═ DATABPO15[ SPV15], DATAFS15[ J ] ═ DATACF15[ SPV15], DATAPT13[ J ] ═ DATABPO13[ TPV13], DATAFT13[ J ] ═ DATACF13[ TPV13], DATAPT15[ J ] ═ DATABPO15[ TPV15], DATAFT15[ J ] ═ DATACF15[ TPV15], J = 1;
step 405: calculating the current strain SCURR _ SFUT (J) FLJG/SLV of the measured optical fiber SFUT with the strain coefficient, and calculating the current temperature TCURR _ TFUT (TYYBWQ) of the measured optical fiber TFUT with the temperature coefficient;
step 406: controlling a micro-displacement mechanism (38-9) in an optical fiber strain temperature coefficient test platform (38) to stretch an optical fiber to tighten the optical fiber, wherein the moving distance is FLSL;
step 407: starting a test system for single test, and reading 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], 1310 Brillouin intensity data DATABPO13[ 0-N ], 1550nm Brillouin spectrum center frequency data DATABPO15[ 0-N ]1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ];
step 408: DATAPS13[ J ] ═ DATABPO13[ SPV13], DATAFS13[ J ] ═ DATACF13[ SPV13], DATAPS15[ J ] ═ DATABPO15[ SPV15], DATAFS15[ J ] ═ DATACF15[ SPV15], SCURR [ J ] ═ SCURR _ SFT;
step 409: judging J < NN, "yes" to proceed to step 410; NO goes to step 411;
step 410: j +1, go to step 406;
step 411: setting the temperature of an oil bath variable temperature cavity (38-2-1) as MBWD ═ TYBWQ + TUSW, and continuously reading TYBWQ until TYBWQ is equal to MBWD and lasts for 5 minutes;
step 412: starting a single test of the test system, specifically referring to step 501, reading 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], 1310 Brillouin intensity data DATABPO13[ 0-N ], 1550 Brillouin intensity data DATABPO15[ 0-N ]1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], and initializing J to 1;
step 413: DATAPT13[ J ] ═ DATABPO13[ TPV13], DATAFT13[ J ] ═ DATACF13[ TPV13], DATAPT15[ J ] ═ DATABPO15[ TPV15], DATAFT15[ J ] ═ DATACF15[ TPV15], TCURR [ J ] ═ TCURR _ TFUT;
step 414: determining J < MM, yes to proceed to step 415, no to proceed to step 416;
step 415: j ═ J +1, go to step 411;
step 416: using SCURR [ 0-NN ] as x-axis data, and using DATAPS13[ 0-NN ], DATAFS13[ 0-NN ], DATAPS15[ 0-NN ], DATAFS15[ 0-NN ] as y-axis data to perform linear fitting calculation to obtain 1310 strength strain coefficient PS13, 1310 frequency shift strain coefficient FS13, 1550 strength strain coefficient PS15 and 1550 frequency shift strain coefficient FS 15;
step 417: TCURR [ 0-MM ] is taken as x-axis data, DATAPT13[ 0-MM ], DATAFT13[ 0-MM ], DATAPT15[ 0-MM ], and DATAFT15[ 0-MM ] are respectively taken as y-axis data to perform linear fitting calculation to obtain 1310 strength temperature coefficient PT13, 1310 frequency shift temperature coefficient FT13, 1550 strength temperature coefficient PT15 and 1550 frequency shift temperature coefficient FT 15.
The flow diagram of the single test function of the test system of the invention is shown in fig. 24, and the specific steps are as follows:
step 501: inputting a pulse width PW, a 1550nm refractive INDEX INDEX15 of the measured optical fiber, a 1310nm refractive INDEX INDEX13 of the measured optical fiber, a measuring range RP, a starting frequency FS, a stopping frequency FE, a frequency interval FA, an accumulation frequency AT, a distance resolution SR and other test parameters by a user, wherein the number N of distance acquisition data is RP/SR, and starting a test;
step 502: reading test parameters, calculating single test time TU (2) INDEX15 RP/vacuum light speed C according to the measuring range RP and the refractive INDEX IN of the measured optical fiber, determining sampling interval time TS according to the distance resolution SR, and calculating the number M of frequency acquisition data (FE-FS)/FA;
step 503: starting a 1310nm ultra-narrow line width light source (3) and a 1550nm ultra-narrow line width light source (20), assigning a local oscillation signal frequency BZF as FS, and setting the BZF to a first local oscillation module (11) and a second local oscillation module (29);
step 504: 1310 Brillouin spectrum test data DATABS13[ 0-M ] [ 0-N ] is assigned to 0, 1310 Brillouin intensity test data DATABP13[ 0-N ] is assigned to 0, 1550 Brillouin spectrum test data DATABS15[ 0-M ] [ 0-N ] is assigned to 0, 1550 Brillouin intensity test data DATABP15[ 0-N ] is assigned to 0, and frequency count FIN is assigned to 0;
step 505: assigning the cumulative number counter ATT to 0, assigning 1310 single Brillouin spectrum data DATABSO13[ 0-N ] to 0, assigning 1310 single Brillouin intensity data DATABPO13[ 0-N ] to 0, assigning 1550 single Brillouin spectrum data DATABSO15[ 0-N ] to 0, and assigning 1550 single Brillouin intensity data DATABPO15[ 0-N ] to 0;
step 506: starting a timing sequence timing TQ, starting a first local oscillator module (11) and a second local oscillator module (29), starting a 1310nm pulse modulation module (5) and a 1550nm pulse modulation module (22) to realize generation of a single test detection pulse, simultaneously starting a first high-speed sampling module (14), acquiring 1310 temporary Brillouin spectrum data DATABSO13T [ 0-N ], starting a second high-speed sampling module (15), acquiring 1310 temporary Brillouin intensity data DATABPO13T [ 0-N ], starting a third high-speed sampling module (31), acquiring 1550 temporary Brillouin data DATABSO15T [ 0-N ], starting a fourth high-speed sampling module (32), and acquiring 1550 temporary Brillouin intensity data DATABPO15T [ 0-N ];
step 507: waiting for the timing value of the timing sequence timing TQ to reach the single test time TU, and stopping the first high-speed sampling module (14), the second high-speed sampling module (15), the third high-speed sampling module (31) and the fourth high-speed sampling module (32);
step 508: 1310 single brillouin spectral data:
DATABSO13[0 to N ] ═ DATABSO13[0 to N ] + DATABSO13T [0 to N ], 1310 single brillouin intensity data DATBPRO13[0 to N ] ═ DATABSO13[0 to N ] + DATABSO13T [0 to N ], DATABSO15[0 to N ] ═ DATABSO15[0 to N ] + DATABSO15T [0 to N ], 1550 single brillouin intensity data DATABSO15[0 to N ] = DATABSO15[0 to N ] + DATABSO15T [0 to N ];
step 509: judging that ATT is larger than or equal to AT, carrying out step 511 if yes, and carrying out step 510 if no;
step 510: ATT ═ ATT + 1;
step 511: DATABS13[ FIN ] [ 0-N ] ═ DATABSO13[ 0-N ],
DATABP13[0～N]＝DATABP13[0～N]+DATABPO13[0～N]，
DATABS15[FIN][0～N]＝DATABSO15[0～N]，
DATABP15[0～N]＝DATABP15[0～N]+DATABPO15[0～N]；
step 512: assigning the local oscillation signal frequency BZF as BZF + FA, setting the BZF to a first local oscillation module (11) and a second local oscillation module (29), and setting FIN to FIN + 1;
step 513: judging whether BZF is larger than or equal to FE; "yes" goes to step 514, and "no" goes to step 505;
step 514: lorentz fitting is carried out on DATABS13[ 0-M ] [ 0-N ] and DATABS15[ 0-M ] [ 0-N ] according to distance point distribution to obtain 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ];
step 515: outputting DATACF13[ 0-N ], DATABP13[ 0-N ], DATABP15[ 0-N ] and DATACF15[ 0-N ] to a display interface, and ending the test.
The process of the SFUT fiber automatic positioning function of the strain coefficient measured fiber in the present invention is shown in fig. 25, and the specific steps are as follows:
step 601: reading an effective change threshold multiple ACTH (percent of total number of pixels) to be 5, calculating an effective change threshold window width multiple ACTHWT (percent of total number of pixels) to be 10/SCL, calculating a judgment window length PDWL (percent of total number of pixels) to be SCL/SR, performing initialization judgment at 1310nm to judge a value of an array ISCHANGE13[ 0-N ] to be 0, performing initialization judgment at 1550nm to judge a value of an array ISCHANGE15[ 0-N ] to be 0, and performing initialization variable J to be 0;
step 602: starting a test system for single test, reading 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], 1310 Brillouin intensity data DATABPO13[ 0-N ], 1550 Brillouin intensity data DATABPO15[ 0-N ];
step 603: 1310nm Brillouin spectrum center frequency BASE data DATACF13_ BASE [ 0-N ] ═ DATACF13[ 0-N ]
BASE data DATACF15_ BASE [ 0-N ] ═ DATACF15[ 0-N ];
step 604: controlling a micro-displacement mechanism (38-9) in an optical fiber strain temperature coefficient test platform (38) to stretch an optical fiber, wherein the stretching length of the optical fiber is FLSL;
step 605: starting a test system for single test, and reading 1310nm Brillouin spectrum central frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum central frequency data DATACF15[ 0-N ];
step 606: calculating 1310nm Brillouin spectrum center frequency change data DATACF13_ DIFF [ 0-N ] ═ DATACF13[ 0-N ] -/DATACF 13_ BASE [ 0-N ]; calculating 1550nm Brillouin spectrum center frequency change data DATACF15_ DIFF [ 0-N ] ═ DATACF15[ 0-N ] -/DATACF 15_ BASE [ 0-N ], and initializing variable I to 0;
step 607: calculating the standard deviation of STD13 ═ DATACF13_ DIFF [ I-I + PDWL: ] and STD15 ═ DATACF15_ DIFF [ I-I + PDWL: ] respectively;
step 608: judging DATACF13_ DIFF [ I ] > STD13 _ ACTH, if yes, performing step 609, and if no, performing step 610;
step 609: ISCHANGE13[ I ] ═ ISCHANGE13[ I ] + 1;
step 610: determining DATACF15_ DIFF [ I ] > STD15 × ACTH, yes to perform step 613, no to perform step 611;
step 611: i ═ I + 1;
step 612: determine I > N, "Yes" proceeds to step 614, No "proceeds to step 607;
step 613: ISCHANGE13[ I ] ═ ISCHANGE13[ I ] +1, go to step 611;
step 614: determine J <4, "yes" to proceed to step 615, and "no" to proceed to step 616;
step 615: j +1, go to step 604;
step 616: initializing the variable I1 to 0, and performing step 619;
step 617: i1 ═ I1+1, go to step 619;
step 618: determine I1< N, "yes" to proceed to step 617, "no" to proceed to step 635;
step 619: judging ISCHENGE 13[ I1] ≧ 3, "YES" go to step 620, "NO" go to step 618;
step 620: initializing a variable K1 to 1, and performing step 623;
step 621: k1 ═ K1+1, go to step 623;
step 622: decision K1< N, "yes" goes to step 621, "no" goes to step 624;
step 623: judging that ISCHENGE 13[ I1+ K1] is not less than 3, if yes, performing step 622, and if no, performing step 624;
step 624: SPV13 is the median value I1 to I1+ K1, and step 625 is performed;
step 625: the initialization variable I1 is 0;
step 626: judging that ISCHANGE15[ I1] ≧ 3, "YES" go to step 629, "NO" go to step 627;
step 627: determine I1< N, "Yes" goes to step 628, No "goes to step 635;
step 628: i1 ═ I1+1, go to step 626;
step 629: initializing the variable K1 to 1, and performing step 632;
step 630: k1 ═ K1+1, go to step 632;
step 631: judging K1< N, "yes" to proceed to step 630, "no" to proceed to step 633;
step 632: judging that ISCHENGE 15[ I1+ K1] is not less than 3, if yes, executing step 631, and if no, executing step 633;
step 633: SPV15 is the median of I1-I1 + K1;
step 634: the positioning is successful, and the values of the SPV13 and the SPV15 are output;
step 635: and returning failure information when the positioning fails.
The process of the TFUT fiber automatic positioning function of the temperature coefficient measured fiber in the present invention is shown in fig. 26, and the specific steps are as follows:
step 701: reading an effective change threshold multiple ACTH (percent of total number of pixels) to be 5, calculating an effective change threshold window width multiple ACTHWT (percent of total number of pixels) to be 10/SCL, calculating a judgment window length PDWL (percent of total number of pixels) to be SCL/SR, performing initialization judgment at 1310nm to judge a value of an array ISCHANGE13[ 0-N ] to be 0, performing initialization judgment at 1550nm to judge a value of an array ISCHANGE15[ 0-N ] to be 0, and performing initialization variable J to be 0;
step 702: starting a test system for single test, specifically referring to step 501, reading 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], 1310 Brillouin intensity data DATABPO13[ 0-N ] and 1550 Brillouin intensity data DATABPO15[ 0-N ];
step 703: 1310nm Brillouin spectrum center frequency BASE data DATACF13_ BASE [ 0-N ] ═ DATACF13[ 0-N ], 1550nm Brillouin spectrum center frequency BASE data DATACF15_ BASE [ 0-N ] ═ DATACF15[ 0-N ];
step 704: reading the uniform temperature TYYBWQ of the oil bath temperature-changing cavity (38-2-1), setting the temperature of the oil bath temperature-changing cavity (38-2-1) as MBWD ═ TYYBWQ + TSJW, and continuously reading TYYBWQ until TYYBWQ is equal to MBWD and lasts for 5 minutes;
step 705: starting a test system for single test, specifically referring to step 501, reading 1310nm Brillouin spectrum central frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum central frequency data DATACF15[ 0-N ];
step 706: calculating 1310nm Brillouin spectrum center frequency change data DATACF13_ DIFF [ 0-N ] ═ DATACF13[ 0-N ] -/DATACF 13_ BASE [ 0-N ]; calculating 1550nm Brillouin spectrum center frequency change data DATACF15_ DIFF [ 0-N ] ═ DATACF15[ 0-N ] -/DATACF 15_ BASE [ 0-N ], and initializing variable I to 0;
step 707: calculating the standard deviation of STD13 ═ DATACF13_ DIFF [ I-I + PDWL ACTHWT ]
STD15 ═ standard deviation of DATACF15_ DIFF [ I to I + PDWL ACTHWT ];
step 708: judging DATACF13_ DIFF [ I ] > STD13 _ ACTH, if yes, performing step 709, and if no, performing step 710;
step 709: ISCHANGE13[ I ] ═ ISCHANGE13[ I ] + 1;
step 710: judging DATACF15_ DIFF [ I ] > STD15 _ ACTH, if yes, performing step 713, and if no, performing step 711;
step 711: i +1, go to step 712;
step 712: judging I > N, if yes, proceeding to step 714, if no, proceeding to step 707;
step 713: ISCHANGE13[ I ] ═ ISCHANGE13[ I ] +1, go to step 711;
step 714: determine J <2, "yes" to proceed to step 715, "no" to proceed to step 716;
step 715: j +1, go to step 704;
step 716: initializing the variable I1 to 0, and performing step 719;
step 717: i1 ═ I1+1, go to step 719;
step 718: determine I1< N, "yes" to proceed to step 717, "no" to proceed to step 735;
step 719: judging ISCHENGE 13[ I1] ≧ 2, "YES" go to step 720, "NO" go to step 718;
step 720: initializing a variable K1 to 1, and performing step 723;
step 721: k1 ═ K1+1, go to step 723;
step 722: determine K1< N, "yes" to proceed to step 721, "no" to proceed to step 724;
step 723: judging that ISCHE 13[ I1+ K1] is not less than 2, if yes, performing step 722, and if no, performing step 724;
step 724: TPV13 is the median value of I1-I1 + K1;
step 725: the initialization variable I1 is 0;
step 726: judging ISCHENGE 15[ I1] ≧ 2, "YES" go to step 729, "NO" go to step 727;
step 727: determine I1< N, "yes" to proceed to step 728, "no" to proceed to step 735;
step 728: i1 ═ I1+1, go to step 726;
step 729: initializing variable K1 to 1, and proceeding to step 732;
step 730: k1 ═ K1+1, proceed to step 732;
step 731: determine K1< N, "yes" to proceed to step 730, "no" to proceed to step 733;
step 732: judging that ISCHE 15[ I1+ K1] is not less than 2, if yes, performing step 731, and if no, performing step 733;
step 733: TPV15 is the median value of I1-I1 + K1;
step 734: if the positioning is successful, outputting the values of TPV13 and TPV 15;
step 735: and returning failure information when the positioning fails.
The flow of the automatic control function of the critical strain state of the strain coefficient measured optical fiber SFUT in the invention is shown in fig. 27, and the specific steps are as follows:
step 801: reading an effective change threshold multiple ACTH (percent of change) to be 5, calculating an effective change threshold window width multiple ACTHWT to be 10/SCL, calculating a judgment window length PDWL to be SCL/SR, reading strain coefficient tested optical fibers SFUT at 1550nm position SPV15 and 1310nm position SPV13, and initializing an initialization variable J to be 0;
step 802: starting a test system for single test, specifically referring to step 501, reading 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], 1310 Brillouin intensity data DATABPO13[ 0-N ] and 1550 Brillouin intensity data DATABPO15[ 0-N ];
step 803: 1310nm Brillouin spectrum center frequency BASE data DATACF13_ BASE [ 0-N ] ═ DATACF13[ 0-N ]
BASE data DATACF15_ BASE [ 0-N ] ═ DATACF15[ 0-N ];
step 804: controlling a micro-displacement mechanism (38-9) in the optical fiber strain temperature coefficient test platform (38) to stretch the optical fiber in the opposite direction, so that the optical fiber is relaxed, wherein the moving distance is FLSL, if the boundary limit switch information of the micro-displacement mechanism (38-9) is received in the moving process, the function is finished, and failure information is returned;
step 805: starting a test system for single test, specifically referring to step 501, reading 1310nm Brillouin spectrum central frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum central frequency data DATACF15[ 0-N ];
step 806: calculating 1310nm Brillouin spectrum central frequency change data
DATACF13_ DIFF [ 0-N ] ═ DATACF13_ BASE [ 0-N ] -DATACF13[ 0-N ]; calculating 1550nm Brillouin spectrum center frequency change data DATACF15_ DIFF [ 0-N ] ═ DATACF15_ BASE [ 0-N ] -DATACF15[ 0-N ], and initializing variable I to 0;
step 807: 1310nm Brillouin spectrum center frequency BASE data DATACF13_ BASE [ 0-N ] ═ DATACF13[ 0-N ]
BASE data DATACF15_ BASE [ 0-N ] ═ DATACF15[ 0-N ];
step 808: calculating the standard deviation of STD13 ═ DATACF13_ DIFF [ SPV 13-SPV 13+ PDWL ACTHWT ],
STD15 is the standard deviation of DATACF15_ DIFF [ SPV15 to SPV15+ PDWL ACTHWT ];
step 809: determining DATACF13_ DIFF [ SPV13] < STD13 × ACTH, yes to proceed to step 810, no to proceed to step 804;
step 810: determining DATACF15_ DIFF [ SPV15] < STD15 × ACTH, yes to proceed to step 811, no to proceed to step 804;
step 811: the automatic operation is successful, the fiber SFUT with the strain coefficient tested is in the critical strain state, and the success information is returned.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.

Claims (20)

1. A Brillouin intensity and frequency shift strain temperature coefficient automatic test system is characterized in that: the device comprises a computer system (1), a first pulse modulation control module (2), a 1310nm laser (3), a first 9:1 coupler (4), a 1310nm pulse modulation module (5), a 1310nm Raman amplifier (6), a 1310nm optical circulator (7), a 1310nm polarization scrambler (8), a first O/E module (9), a first mixer (10), a first local oscillator module (11), a first 1:1 coupler (12), a first filter (13), a first high-speed acquisition module (14), a second high-speed acquisition module (15), a second O/E module (16), a first optical filter (17), a second 1:1 coupler (18), a second pulse modulation control module (19), a 1550nm laser (20), a second 9:1 coupler (21), a 1550nm pulse modulation module (22), a 1550nm amplifier (23), The device comprises a 1550nm optical circulator (24), a 1550nm polarization scrambler (25), a third 1:1 coupler (26), a third O/E module (27), a second mixer (28), a second local oscillator module (29), a second filter (30), a third high-speed acquisition module (31), a fourth high-speed acquisition module (32), a fourth O/E module (33), a second optical filter (34), a fourth 1:1 coupler (35), a 1310nm/1550nm wavelength division multiplexer (36), a measured optical fiber (37) and an optical fiber strain temperature coefficient test platform (38);
the computer system (1) is respectively connected with the first pulse modulation control module (2), the 1310nm laser (3), the first local oscillator module (11), the first high-speed acquisition module (14), the second high-speed acquisition module (15), the second pulse modulation control module (19), the 1550nm laser (20), the second local oscillator module (29), the third high-speed acquisition module (31) and the fourth high-speed acquisition module (32) through circuits;
the pulse modulation control module (2) modulates the detection pulse by controlling the 1310nm pulse modulation module (5);
the first ends of the pulse modulation control module (2), the 1310nm pulse modulation module (5), the 1310nm Raman amplifier (6) and the 1310nm optical circulator (7) are sequentially connected through a line; the second end of the 1310nm optical circulator (7) is connected with the first 50% input end of the second 1:1 coupler (18) through a line; the third end of the 1310nm optical circulator (7) is connected with a 1310nm interface of a 1310nm/1550nm wavelength division multiplexer (36) through a line;
the 1310nm laser (3) and the first 9:1 coupler (4) are connected through a line;
the first 9:1 coupler (4) has 90% of output ends connected with the 1310nm pulse modulation module (5) and 10% of output ends connected with one end of the 1310nm polarization scrambler (8);
the other end of the 1310nm polarization scrambler (8) is connected with a first 50% input end of a first 1:1 coupler (12) through a line;
a first 50% output end of the first 1:1 coupler (12), a first O/E module (9), a first frequency mixer (10) and a first local oscillator module (11) are connected through a line; the second 50% input end of the first 1:1 coupler (12) is connected with the first 50% output end of the second 1:1 coupler (18) through a line;
the first mixer (10), the first filter (13) and the first high-speed acquisition module (14) are connected through a line;
the second high-speed acquisition module (15), the second O/E module (16), the first optical filter (17) and the second 50% output end of the second 1:1 coupler (18) are connected through a line;
the first ends of the second pulse modulation control module (19), the 1550nm pulse modulation module (22), the 1550nm Raman amplifier (23) and the 1550nm optical circulator (24) are sequentially connected through a circuit;
the second end of the 1550nm optical circulator (24) is connected with a 1550nm interface of the 1310nm/1550nm wavelength division multiplexer (36) through a line; the COM interface of the 1310nm/1550nm wavelength division multiplexer (36) is connected with a measured optical fiber (37);
the third end of the 1550nm optical circulator (24) is connected with the first 50% input end of the fourth 1:1 coupler (35) through a line;
the 1550nm laser (20) and the first input end of the second 9:1 coupler (21) are connected through a line;
a second 9:1 coupler (21), wherein 90% of the output end of the coupler is connected with the 1550nm pulse modulation module (22), and 10% of the output end of the coupler is connected with one end of the 1550nm polarization scrambler (25) through a line;
the other end of the 1550nm polarization scrambler (25) is connected with the first 50% input end of the third 1:1 coupler (26) through a circuit;
the first 50% output end of the third 1:1 coupler (26), the third O/E module (27), the second mixer (28) and the second local oscillator module (29) are connected through lines;
the second 50% input end of the third 1:1 coupler (26) and the first 50% output end of the fourth 1:1 coupler (35) are connected through a line;
the second mixer (28), the second filter (30) and the third high-speed acquisition module (31) are connected through a line;
the fourth high-speed acquisition module (32), the fourth O/E module (33), the second optical filter (34) and the second 50% output end of the fourth 1:1 coupler (35) are connected through a line;
the optical fiber strain temperature coefficient testing platform (38) comprises a general communication interface (38-1), a constant-temperature and variable-temperature box body (38-2), a first optical fiber clamping block (38-3), a second optical fiber clamping block (38-4), a heat preservation door (38-5), a first folding shell (38-6), a second folding shell (38-7), a universal wheel (38-8), a micro-displacement mechanism (38-9), a constant-temperature cavity temperature sensor (38-10), a fixed end optical fiber clamp (38-11), an oil bath box locking mechanism (38-12) and an oil bath variable-temperature box (38-13);
general communication interface (38-1): the system is a general communication interface for controlling the work of a test platform by an external computer system (1), sends communication commands including heating, heat preservation, refrigeration and stretching, and returns test data of a temperature sensor;
constant temperature-variable temperature box (38-2): the optical fiber strain temperature coefficient test platform is a main structure of the optical fiber strain temperature coefficient test platform;
first fiber clamping block (38-3): is the entrance of the tested optical fiber (37) into the test platform;
second fiber clamping block (38-4): the measured optical fiber (37) enters the inlet of the telescopic constant temperature cavity from the oil bath variable temperature cavity;
thermal insulating door (38-5): the door plate is a door plate of a constant temperature-variable temperature box body (38-2) and is used for reducing heat loss of an oil bath temperature-variable cavity and a stretching constant temperature cavity in the working process;
first folded housing (38-6): the test platform has the functions of ensuring the appearance integrity of the test platform and isolating the air flow between the 0-5 level constant temperature cavity and the external environment as far as possible; the folding and stretching of the shell is realized by soft plastic or leather materials, the typical value of the thickness is 1.5mm, and the recommended thickness range is 1-2 mm;
second folded housing (38-7): the test platform has the functions of ensuring the appearance integrity of the test platform and isolating the air flow between the 0-5 level frame door panel and the external environment as far as possible; the folding and stretching of the shell is realized by soft plastic or leather materials, the typical value of the thickness is 1.5mm, and the recommended thickness range is 1-2 mm;
universal wheel (38-8): the number of the constant-temperature and variable-temperature box bodies (38-2) is 6, and the locking function is provided, so that the test platform is convenient to transfer and transport;
micro-displacement mechanism (38-9): the optical fiber stretching device is used for stretching the optical fiber at the stretching end in the constant-temperature cavity;
oven temperature sensor (38-10): temperature measurement feedback for the optical fiber in the stretching constant temperature cavity;
fixed end fiber clamp (38-11): the optical fiber fixing device is used for fixing an optical fiber at the fixed end in the stretching constant temperature cavity;
oil bath tank locking mechanism (38-12): the oil bath temperature changing box is used for ensuring the position of the oil bath temperature changing box in the temperature changing cavity to be fixed;
oil bath variable temperature box (38-13): the coiling optical fiber heating device is used for placing coiled optical fibers in an unstressed state, and is internally provided with an oil material and a resistance wire heating system which can heat the oil material.
2. The automatic Brillouin strength and frequency shift strain temperature coefficient testing system according to claim 1, wherein: the constant-temperature and variable-temperature box body (38-2) comprises an oil bath temperature-variable cavity (38-2-1), a 5-level constant-temperature cavity (38-2-2), a 4-level constant-temperature cavity (38-2-3), a 3-level constant-temperature cavity (38-2-4), a 2-level constant-temperature cavity (38-2-5), a 1-level constant-temperature cavity (38-2-6) and a 0-level constant-temperature cavity (38-2-7); (38-2-2) - (38-2-7) are 6 constant temperature intercommunicating cavities;
oil bath temperature-variable cavity (38-2-1): a detachable oil bath temperature changing box (38-13) is arranged;
6 constant temperature intercommunicating cavities (38-2-2) - (38-2-7) for placing a micro-displacement mechanism for stretching the measured optical fiber (37) and a related clamp;
5-stage thermostatic chamber (38-2-2): the device is used for placing a fixed end optical fiber clamp (38-11), and is provided with 2 resistance wire heating devices (38-2-2-1), 4 sliding rails (38-2-2-2), 2 clamping plates (38-2-2-3) and 8 magnet pieces (38-2-2-4); the sizes and the layouts of the resistance wire heating device (38-2-2-1), the slide rail (38-2-2-2), the clamping plate (38-2-2-3) and the magnet piece (38-2-2-4) are consistent with those of the 4-level thermostatic cavity (38-2-3);
4-stage thermostatic chamber (38-2-3): 2 resistance wire heating devices (38-2-3-1), a limit switch group (38-2-3-2), 4 sliding rails (38-2-3-3), 2 clamping plates (38-2-4-4) and 8 magnet pieces (38-2-3-5) are designed;
the limit switch group (38-2-3-2) comprises 4 limit switches;
3-level thermostatic chamber (38-2-4): 2 resistance wire heating devices (38-2-4-1), a limit switch group (38-2-4-2), 4 sliding rails (38-2-4-3), 2 clamping plates (38-2-4-4) and 8 magnet pieces (38-2-4-5) are designed; the sizes and the layouts of the resistance wire heating device (38-2-4-1), the limit switch group (38-2-4-2), the sliding rail (38-2-4-3), the clamping plate (38-2-4-4) and the magnet piece (38-2-4-5) are consistent with those of the 4-level thermostatic cavity (38-2-3);
the limit switch group (38-2-4-2) comprises 4 limit switches;
level 2 thermostatic chamber (38-2-5): 2 resistance wire heating devices (38-2-5-1), 4 sliding rails (38-2-5-3), 2 clamping plates (38-2-5-4) and 8 magnet pieces (38-2-5-5) are designed; the sizes and the layouts of the resistance wire heating device (38-2-5-1), the limit switch group (38-2-5-2), the sliding rail (38-2-5-3), the clamping plate (38-2-5-4) and the magnet piece (38-2-5-5) are consistent with those of the 4-level thermostatic cavity (38-2-3) (38-2-3);
the limit switch group (38-2-5-2) comprises 4 limit switches;
level 1 thermostatic chamber (38-2-6): 2 resistance wire heating devices (38-2-6-1), a limit switch group (38-2-6-2), 4 sliding rails (38-2-6-3), 2 clamping plates (38-2-6-4) and 8 magnet pieces (38-2-6-5) are designed; the sizes and the layouts of the resistance wire heating device (38-2-6-1), the limit switch group (38-2-6-2), the sliding rail (38-2-6-3), the clamping plate (38-2-6-4) and the magnet piece (38-2-6-5) are consistent with those of the 4-level thermostatic cavity (38-2-3);
level 0 oven chamber (38-2-7): an air-conditioning refrigeration system (38-2-7-1), a resistance wire heating device (38-2-7-2) at 1 position and 4 limit switch groups (38-2-7-3) are designed.
3. The automatic Brillouin strength and frequency shift strain temperature coefficient testing system according to claim 2, wherein: 4 level thermostatic chamber (38-2-3), including following structure:
resistance wire heating device (38-2-3-1): 2 positions in total, 1 position of each of the top surface and the bottom surface has no bulge, and whether the heating is carried out is controlled by an external computer;
a limit switch group (38-2-3-2): the number of the top surfaces and the bottom surfaces are 2 respectively, the top surfaces and the bottom surfaces can move in a sliding rail (38-2-2-2) of a 5-level thermostatic chamber (38-2-2), the two ends of the sliding rail are limited, and meanwhile, the information that the limit switch group (38-2-3-2) reaches the two ends of the sliding rail (38-2-2-2) is informed to an external computer system;
slide rail (38-2-3-3): 4 limiting switches correspond to the positions of the limiting switch groups (38-2-4-2) of the 3-level thermostatic chambers (38-2-4) and provide a guiding function for the 3-level thermostatic chambers (38-2-4);
chucking plate (38-2-3-4): the upper and lower clamping sheets are totally embedded in side grooves of the level-4 constant temperature cavity (38-2-3) when the level-3 constant temperature cavity (38-2-4) is in an unstretched state, and the depth of the grooves is the same as the thickness of the clamping sheets; when the 3-level thermostatic chamber (38-2-4) is stretched and lengthened to a proper position, the clamping plate (38-2-3-4) is placed in the grooves on the top surface and the bottom surface, and the depth of the groove is 4-10 mm smaller than the thickness of the clamping plate, so that the 3-level thermostatic chamber (38-2-4) and the 4-level thermostatic chamber (38-2-3) can not move relatively in the stretching process of the optical fiber;
(38-2-3-5) magnet piece: the number of the clamping plates is 8, 1 is respectively arranged on the top surface groove and the bottom surface groove, 2 is arranged on the side surface groove, and 1 is respectively arranged on the front surface and the back surface of the two clamping plates (38-2-3-4); when the clamping plates (38-2-3-4) are arranged in the top surface groove, the bottom surface groove and the side surface groove, the clamping plates can be sucked by the corresponding magnet sheets to play a certain fixing role.
4. The automatic Brillouin strength and frequency shift strain temperature coefficient testing system according to claim 2, wherein: a level 0 thermostatic chamber (38-2-7) comprising the following structure:
air-conditioning refrigeration system (38-2-7-1): when the temperature in the stretching constant-temperature cavity is higher than a set value, the refrigerating system is started to reduce the temperature in the cavity;
resistance wire heating device (38-2-7-2): because the micro-displacement mechanism (38-9) is required to be arranged on the bottom surface of the 0-level thermostatic cavity (38-2-7), only 1 group of heating devices positioned on the top surface of the cavity body is designed;
a limit switch group (38-2-7-3): the total number of the groups is 4, and the layout is the same as that of the limit switch group (38-2-3-2).
5. The automatic Brillouin strength and frequency shift strain temperature coefficient testing system according to claim 2, wherein: a first fiber clamping block (38-3) comprising the following structure:
handle (38-3-1): the first optical fiber clamping block (38-3) is convenient to detach and insert;
fiber-passing groove (38-3-2): the semicircular groove structure is used for placing the optical fiber (37) to be detected and preventing the first optical fiber clamping block (38-3) from extruding the optical fiber (37) to be detected when being inserted into the constant-temperature and variable-temperature box body (38-2);
the first fiber clamping block (38-3) is structurally assembled as follows:
firstly, putting an optical fiber into an optical fiber penetrating groove, then inserting a first optical fiber clamping block (38-3) into a constant temperature-variable temperature box body (38-2), wherein the corresponding part of the constant temperature-variable temperature box body (38-2) adopts a dovetail groove-shaped matching structure, and the heat exchange between an oil bath temperature-variable cavity (38-2-1) and the outside is reduced as much as possible; the part of the tested optical fiber (37) contacting with the optical fiber insertion slot (38-3-2) is wrapped by asbestos and foam soft materials to reduce the air flow at the position of the optical fiber insertion slot.
6. The automatic Brillouin strength and frequency shift strain temperature coefficient testing system according to claim 2, wherein: a second fiber clamping block (38-4) comprising the following structure:
handle (38-4-1): the second optical fiber clamping block (38-4) is convenient to detach and insert;
fiber-passing groove (38-4-2): the semicircular groove structure is used for placing the optical fiber (37) to be detected and preventing the second optical fiber clamping block (38-4) from being extruded to the optical fiber (37) to be detected when being inserted into the constant-temperature and variable-temperature box body (38-2);
the structure of the second fiber clamping block (38-4) is assembled as follows:
firstly, putting an optical fiber into an optical fiber penetrating groove, then inserting a second optical fiber clamping block (38-4) into a constant temperature-variable temperature box body (38-2), and reducing heat exchange between an oil bath temperature-variable cavity (38-2-1) and stretching constant temperature cavities (38-2-2) - (38-2-7) as far as possible by adopting a step-shaped matching structure; the part of the optical fiber, which is contacted with the optical fiber insertion groove, is wrapped by asbestos and foam soft materials so as to reduce the air flow at the position of the optical fiber insertion groove; the section also defines an entrance chamfer to facilitate insertion of the second fiber clamping block (38-4).
7. The automatic Brillouin strength and frequency shift strain temperature coefficient testing system according to claim 2, wherein: thermal insulation door (38-5) includes following structure:
main frame door panel (38-5-1): the oil bath temperature-changing cavity (38-2-1) is used for sealing the oil bath temperature-changing cavity, and is also used for placing a frame door plate assembly and an inner core door plate assembly which are not pulled out, and 2 sliding rails (38-5-1-1) are arranged in the oil bath temperature-changing cavity;
4-level retractable door panel (38-5-2): belongs to a frame door plate component and is provided with 2 sliding rails (38-5-2-1) and 2 limiting blocks (38-5-2-2); can slide in a straight line in the sliding rail (38-5-1-1) and is limited by a limit block (38-5-2-2);
3-level retractable door panel (38-5-3): belongs to a frame door plate component and is provided with 2 sliding rails (38-5-3-1) and 2 limiting blocks (38-5-3-2); can slide in a straight line in the sliding rail (38-5-2-1) and is limited by a limit block (38-5-3-2);
2-stage retractable door panel (38-5-4): belongs to a frame door plate component and is provided with 2 sliding rails (38-5-4-1) and 2 limiting blocks (38-5-4-2); can slide in a straight line in the sliding rail (38-5-3-1) and is limited by a limit block (38-5-4-2); the size distribution of the sliding rail (38-5-4-1) and the limiting block (38-5-4-2) is consistent with that of the 4-level telescopic door panel (38-5-2);
level 1 retractable door panel (38-5-5): belongs to a frame door plate component and is provided with 2 sliding rails (38-5-5-1) and 2 limiting blocks (38-5-5-2); can slide in a straight line in the sliding rail (38-5-4-1) and is limited by a limit block (38-5-5-2); the size distribution of the sliding rail (38-5-5-1) and the limiting block (38-5-5-2) is consistent with that of the 4-level telescopic door panel (38-5-2);
0-level retractable door panel (38-5-6): 2 limit blocks (38-5-6-2) are designed; can slide in a straight line in the sliding rail (38-5-5-1) and is limited by a limit block (38-5-6-2);
level 5 inner core door panel (38-5-7): belongs to an inner core door plate component, and is provided with 2 sliding rails (38-5-7-1) and 2 limiting blocks (38-5-7-2); can slide in a straight line in the sliding rail (38-5-1-2) and is limited by a limit block (38-5-7-2);
level 4 inner core door panel (38-5-8): belongs to an inner core door plate component, 2 sliding rails (38-5-8-1) and 2 limiting blocks (38-5-8-2) are designed; can slide in a straight line in the sliding rail (38-5-7-1) and is limited by a limit block (38-5-8-2);
level 3 inner core door panel (38-5-9): belongs to an inner core door plate component, and is provided with 2 sliding rails (38-5-9-1) and 2 limiting blocks (38-5-9-2); can slide in a straight line in the sliding rail (38-5-8-1) and is limited by a limit block (38-5-9-2); the size layout of the sliding rail (38-5-9-1) and the limiting block (38-5-9-2) is consistent with that of the 4-level inner core door panel (38-5-8);
level 2 inner core door panels (38-5-10): belongs to an inner core door plate component, and is provided with 2 sliding rails (38-5-10-1) and 2 limiting blocks (38-5-10-2); can slide in a straight line in the sliding rail (38-5-9-1) and is limited by a limit block (38-5-10-2); the size layout of the sliding rail (38-5-10-1) and the limiting block (38-5-10-2) is consistent with that of the 4-level inner core door panel (38-5-8);
level 1 inner core door panel (38-5-11): belongs to an inner core door plate component and is provided with 2 limit blocks (38-5-11-1); can slide in a straight line in the sliding rail (38-5-10-1) and is limited by a limit block (38-5-11-1); the size distribution of the limiting block (38-5-11-1) is consistent with that of a 4-level inner core door plate (38-5-8);
hinge (38-5-12): the heat preservation door (38-5) is connected with the constant-temperature and variable-temperature box body (38-2) through 3-5 hinges, so that the door can be opened and closed; the contact part after closing the door is made of soft rubber materials or is of a step-shaped structure, so that air flow at the gap is reduced as much as possible; wherein the 0-level telescopic door panel (38-5-2) is connected with the 0-level thermostatic chamber (38-2-7) by at least 1 hinge;
door handle (38-5-13): the heat preservation door (38-5) is convenient to open and close;
when the 5-level constant temperature cavities sequentially extend from 0 to 5 levels, the 0-level telescopic door panel (38-5-2) and the frame door panel component synchronously extend one by one according to the 0 to 5-level sequence;
when the 1-level telescopic door plate is stretched, the 1-level inner core door plate can be synchronously pulled out.
8. The automatic Brillouin strength and frequency shift strain temperature coefficient testing system according to claim 7, wherein: the main frame door panel (38-5-1) comprises the following structures:
a slide rail (38-5-1-1); corresponding to the limiting block (38-5-2-2), the guiding function is provided for the 4-level telescopic door panel (38-5-2);
slide rail (38-5-1-2): corresponding to the limiting block (38-5-7-2), the guiding function is provided for the 5-level inner core door plate (38-5-7);
a 4-level telescopic door panel (38-5-2); the structure comprises the following structures:
slide rail (38-5-2-1): corresponding to the limiting block (38-5-3-2), the guiding function is provided for the 3-level telescopic door panel (38-5-3);
a limiting block (38-5-2-2): limiting the moving position of the 4-stage telescopic door panel (38-5-2);
a 3-level telescopic door panel (38-5-3); the structure comprises the following structures:
slide rail (38-5-3-1): corresponding to the limiting block (38-5-4-2), the guiding function is provided for the 2-level telescopic door panel (38-5-4);
a limiting block (38-5-3-2): limiting the moving position of the 3-level telescopic door panel (38-5-3);
0 level telescopic door panel (38-5-6), including following structure:
a limiting block (38-5-6-1): can move in the sliding rail (38-5-5-1) to limit the moving position of the 0-level telescopic door panel (38-5-6);
a class 5 inner core door panel (38-5-7) comprising the following structure:
slide rail (38-5-7-1): corresponding to the limiting block (38-5-8-2), the guiding function is provided for the 4-level inner core door plate (38-5-8);
a limiting block (38-5-7-2): limiting the movement position of the class 5 inner core door panel (38-5-7);
a class 4 inner core door panel (38-5-8) comprising the following structure:
slide rail (38-5-8-1): corresponding to the limiting block (38-5-9-2), the guiding function is provided for the 3-level inner core door plate (38-5-9);
a limiting block (38-5-8-2): the movement position of the level 4 inner core door panel (38-5-8) is restricted.
9. The automatic Brillouin strength and frequency shift strain temperature coefficient testing system according to claim 2, wherein: micro-displacement mechanism (38-9) comprising the steps of:
servo control interface (38-9-1): is a communication interface for controlling the movement of the micro-displacement mechanism by an external computing system (1);
servo motor (38-9-2): the high-precision rotation variation can be generated;
coupling, screw (38-9-3): converting the rotation variation generated by the servo motor (38-9-2) into the linear displacement variation of the optical fiber clamp (38-9-4) at the stretching end;
draw end fiber clamp (38-9-4): a measured optical fiber (37) for fixing the stretching end;
screw (38-9-5): fixing a micro-displacement mechanism (38-9) on a 0-level constant-temperature cavity (38-2-7);
the micro-displacement mechanism (38-9) is fixed on the 0-level constant temperature cavity (38-2-7) through a screw (38-9-5), the servo motor (38-9-2) is controlled to rotate by the external computer system (1) through the servo control interface (38-9-1), and the rotation variation of the servo motor (38-9-2) is converted into the linear displacement variation of the optical fiber clamp (38-9-4) at the stretching end through the coupler and the screw (38-9-3);
the typical displacement stroke value of the micro-displacement mechanism (38-9) is 200mm, the stroke range is 150-300 mm, and the positioning precision is 1-3 mu m;
in the micro-displacement mechanism (38-9), the optical fiber clamp (38-9-4) at the stretching end moves towards the direction of the servo motor (38-9-2) to reduce the displacement and increase the optical fiber strain; movement in the opposite direction to the servo motor (38-9-2) is an increase in displacement and a decrease in fiber strain.
10. The automatic Brillouin strength and frequency shift strain temperature coefficient testing system according to claim 2, wherein: thermostatic chamber temperature sensor (38-10) comprising the following structure:
support bar (38-10-1): the tail part of the constant temperature cavity is fixed on the side walls of the 0-level and 5-level constant temperature cavities, and the middle part of the constant temperature cavity can be bent randomly; the tail part of the supporting rod can be additionally provided with a telescopic structure;
temperature-sensitive element (38-10-2): a Pt100 temperature sensor is selected.
11. The automatic Brillouin strength and frequency shift strain temperature coefficient testing system according to claim 2, wherein: a fixed end fiber clamp (38-11) comprising the following structure:
base (38-11-1): the bearing pressing plate (38-11-2) is used for pressing and fixing the tested optical fiber (37);
pressing plate (38-11-2): the device is used for pressing and fixing the tested optical fiber (37);
a handle (38-11-3);
screw (38-11-4): is used for fixing the pressure plate (38-11-2) and the base (38-11-1);
platen fiber holes (38-11-5): the diameter of the hole contacted with the measured optical fiber (37) has a negative tolerance with the diameter of the measured optical fiber (37), and the negative tolerance range of the diameter is phi-0.01 mm to-0.05 mm;
base fiber hole (38-11-6): the diameter of the hole contacted with the measured optical fiber (37) has a negative tolerance with the diameter of the measured optical fiber (37), and the negative tolerance range of the diameter is phi-0.01 mm to-0.05 mm;
the upper surface of the base (38-11-1) needs to be designed with a sinking surface, the pressing plate (38-11-2) is guaranteed to be sunk and placed by taking the sinking surface as a reference, the sinking surface of the base (38-11-1) and the corresponding surface of the pressing plate (38-11-2) guarantee that the verticality tolerance of the reference surface A, B is smaller than 0.01mm, the distances between the two surfaces and the centers of the semicircular holes of the optical fibers are strictly consistent, the distance tolerance requirement is smaller than 5 mu m, the contact length between the clamp and the optical fibers is larger than 100mm, namely the depth of the two semicircular holes is larger than 100mm, and therefore the large enough contact area between the clamp and the optical fibers is guaranteed.
12. The automatic Brillouin strength and frequency shift strain temperature coefficient testing system according to claim 2, wherein: an oil bath incubator (38-13) comprising the following structure:
oil bath case housing (38-13-1): is the main structure of the oil bath temperature changing box (38-13);
control interface (38-13-2): is a control interface for controlling the temperature change of the oil bath tank by an external computer;
main hole (38-13-3): the tested optical fiber (37) is used for pouring oil and putting the oil into a coil; the typical diameter value of the main hole (38-13-3) is 270mm, and the diameter range is 250-300 mm;
main cover (38-13-4): the screw thread sealing structure is used for sealing the main hole;
rubber cover (38-13-5): the small hole (38-13-6) is used for sealing the small hole (38-13-6) and is only used before the optical fiber (37) to be tested is placed, and the small hole (38-13-6) is in an open state in the formal working process;
orifice (38-13-6): the part of the tested optical fiber (37) which is used for being placed in and out of the oil bath temperature-changing box (38-13) in the temperature-changing test working process; the typical diameter value of the small hole (38-13-6) is 10mm, and the diameter size range is 3-15 mm;
intersecting pore gap (38-13-7): is a gap formed by the intersection of the main hole (38-13-3) and the small hole (38-13-6); after the coiled optical fiber (37) to be detected is placed into the main hole (38-13-3), the two ends of the optical fiber enter the small hole (38-13-6) from the intersection hole gap (38-13-7); the typical value of the size of the alloy is 2-5 mm;
temperature sensor No. 1 (38-13-8): for measuring the temperature at the central position of the perforated partition (38-13-15);
temperature sensor No. 2 (38-13-9): for measuring the temperature of one corner of the perforated partition (38-13-15);
temperature sensor No. 3 (38-13-10): for measuring the temperature of one corner of the perforated partition (38-13-15);
temperature sensor No. 4 (38-13-11): for measuring the temperature of one corner of the perforated partition (38-13-15);
temperature sensor No. 5 (38-13-12): for measuring the temperature of one corner of the perforated partition (38-13-15);
the No. 1-5 temperature sensors are distributed in the center and 4 corner positions of the partition plate with the holes, temperature data of the five points are measured, and the computer can accurately calculate the temperature of the temperature field of the measured optical fiber by acquiring and processing the data in real time;
temperature sensor No. 6 (38-13-13): the device is used for measuring the output temperature of the heating resistance wire, accurately adjusting the temperature change of the oil bath temperature change box, and simultaneously monitoring the working state of the heating resistance wire to prevent high-temperature damage;
resistance wire heating device (38-13-14): heating the oil, and controlling the heating power of the oil by an external computer system;
perforated partition (38-13-15): the device is used for placing the measured optical fiber in the temperature-varying test process, an aluminum alloy material is used, the typical diameter size of the hole in the partition plate is 15mm, and the diameter size range is 10-25 mm;
a handle (38-13-16);
oil change ports (38-13-17): the outlet of the oil is replaced.
13. A Brillouin intensity and frequency shift strain temperature coefficient automatic test method is characterized in that: the automatic testing system for the Brillouin strength and frequency shift strain temperature coefficient according to claim 12, comprising the following steps:
step 101: the computer system (1) carries out self-inspection on the automatic testing system of the Brillouin intensity and the frequency shift strain temperature coefficient;
step 102: judging whether the self-checking passes, if so, performing step 103, and if not, performing step 104;
step 103: displaying and outputting an error prompt to wait for processing;
step 104: putting the tested optical fiber into an optical fiber strain temperature coefficient test platform (38), wherein a part of the optical fiber with the length of TLV is put into an oil bath temperature-variable box (38-13) to be used as the tested optical fiber with the temperature coefficient TFUT; one part of the fiber is fixed between a stretching end fiber clamp (38-9-4) and a fixed end fiber clamp (38-11) in a tensioned state and is used as a strain coefficient tested fiber SFUT;
step 105: setting the optical fiber length FL, sampling resolution SR parameters, test starting frequency FS, test ending frequency FE, test frequency interval FI, pulse width PW, accumulation times AT, 1310nm refractive INDEX INDEX13 and 1550nm refractive INDEX INDEX 15;
step 106: starting an automatic positioning function, acquiring the 1550nm position TPV15 and the 1310nm position TPV13 of a temperature coefficient tested optical fiber TFUT, and the 1550nm position SPV15 and the 1310nm position SPV13 of a strain coefficient tested optical fiber SFUT, and automatically controlling the movement of a micro-displacement structure (38-9) to enable the optical fiber to be in a critical strain state;
step 107: manually measuring the length SLV of an optical fiber strain acting area between a stretching end optical fiber clamp (38-9-4) and a fixed end optical fiber clamp (38-11);
step 108: inputting the length SLV of the optical fiber strain action area and the length TLV of the optical fiber temperature action area;
step 109: starting a coefficient automatic analysis function, and obtaining 1310 strength strain coefficient PS13 and 1310 strength temperature coefficient; PT13, 1310 frequency-shifted strain coefficient FS13, 1310 frequency-shifted temperature coefficient FT13, 1550 strength strain coefficient PS15, 1550 strength temperature coefficient PT15, 1550 frequency-shifted strain coefficient FS15, 1550 frequency-shifted temperature coefficient FT 15;
step 110: and displaying and outputting 1310 strength strain coefficient PS13, 1310 strength temperature coefficient PT13, 1310 frequency shift strain coefficient FS13, 1310 frequency shift temperature coefficient FT13, 1550 strength strain coefficient PS15, 1550 strength temperature coefficient PT15, 1550 frequency shift strain coefficient FS15 and 1550 frequency shift temperature coefficient FT15, and finishing the test process.
14. The automatic testing method for the brillouin intensity and frequency shift strain temperature coefficient according to claim 13, characterized in that: in step 104, the step of laying the temperature coefficient measured optical fiber and the strain coefficient measured optical fiber on the optical fiber strain temperature coefficient test platform is as follows:
step 201: dividing the tested optical fiber into 5 parts, namely an optical fiber access end external redundant optical fiber RYOFS with the length of RYFS, the typical value of which is 50m, the recommended length range is 20m < RYFS <5000m, the optical fiber is used for being placed outside an optical fiber strain temperature coefficient test platform (38), the temperature coefficient tested optical fiber TFUT with the length of TLV, the typical value of TLV is 10m, the recommended length range is 5m < TLV < 20m, the optical fiber is used for being placed in an oil bath temperature variation box (38-13), the strain coefficient tested optical fiber SFUT with the length of larger than SLV is used for being placed in an oil bath temperature variation box (38-2-7), the length range of the optical fiber SFUT with the length of 0.15m < SLV <1.2m, the optical fiber SFUT is used for being placed in a 5-level thermostatic chamber (38-2-2) -0-7), one side close to the TFUT is a fixed end, the other side is a stretching end, the optical fiber with the length of JG01, the typical value of the optical fiber is 1.5m, the recommended size range of JG01<3m, is the portion where the external redundant fiber is connected to the TFUT; an intracavity spacer fiber of length JG02, typically 0.8m, with recommended dimensions in the range of 0.6m < JG02<1.2m, being the part where TFUT and SFUT are connected and a fiber end external redundant fiber RYOFE of length RYFE, typically 20m, with recommended lengths in the range of 10m < RYFE <100m, for placement outside of the fiber strain temperature coefficient test platform (38); at the moment, the optical fiber strain temperature coefficient test platform (38) is in a non-lengthened state, and the heat preservation door (38-5) is in a closed state;
step 202: judging the number NJ of the constant temperature cavity stages needing to be pulled out according to the length SFUT of the stretched optical fiber, wherein the number NJ of the constant temperature cavity stages is initially assigned to be 0 as the 0-stage constant temperature cavity is pulled out firstly;
step 203: judging that (NJ +1) × 0.18 is not less than SFUT; "yes" goes to step 206, and "no" goes to step 204;
step 204: the NJ-level constant-temperature cavity is pulled out manually, the NJ-level telescopic door panel is pulled out, and after the NJ-level telescopic door panel is pulled out, the NJ-level corresponding limit switch (38-2-7-3) is automatically and simultaneously in an electrified opening state, wherein NJ is NJ + 1;
step 205: opening the clamping plate (38-2-6-4), clamping the NJ-level constant-temperature cavity, and performing step 203;
step 206: opening the heat preservation door (38-5), and enabling the door handle (38-5-13) to be supported on a supporting plane including the ground or the table top;
step 207: drawing out the first optical fiber clamping block (38-3) and the second optical fiber clamping block (38-4), and opening the main cover (38-13-4) and the rubber cover (38-13-5);
step 208: passing the temperature coefficient measured optical fiber TFUT with length TLV through the main hole (38-13-3) to be placed on the perforated partition plate (38-13-15) in a relaxed coiled state;
step 209: moving the extra-cavity spacing optical fiber with the length of JG01 and the intra-cavity spacing optical fiber with the length of JG02 into the small hole (38-13-6) from the intersection hole gap (38-13-7), and then placing and screwing the main cover (38-13-4) on the main hole (38-13-3);
step 210: penetrating an intracavity interval optical fiber with the length of JG02 from an optical fiber penetrating groove (38-4-2) into a stretching constant temperature cavity, and wrapping a part which is contacted with the optical fiber penetrating groove (38-4-2) by a little asbestos;
step 211: fixing the fixed end of the SUFT on a fixed end optical fiber clamp (38-11), namely unscrewing a screw (38-11-4), taking out a pressing plate (38-11-2), placing the fixed end of the SFUT in the base optical fiber hole (38-11-6), pressing the pressing plate (38-11-2) on the base (38-11-1) to ensure that the measured optical fiber corresponds to the pressing plate optical fiber hole (38-11-5), and screwing the screw (38-11-4);
step 212: moving a stretching end optical fiber clamp (38-9-4) to the total displacement middle position of a micro displacement mechanism (38-9), fixing the stretching end of the optical fiber SUFT with the strain coefficient to be measured on the stretching end optical fiber clamp (38-9-4), wherein the detailed steps are the same as the step 211, and simultaneously enabling the SUFT to be in a tense state as much as possible;
step 213: confirming that no bend radius of the intracavity spaced fiber of length JG02 below 0.05m is present, inserting a second fiber clamping block (38-4);
step 214: an extra-cavity interval optical fiber with the length of JG01 is penetrated through an optical fiber penetrating groove (38-3-2), and a part contacted with the optical fiber penetrating groove (38-4-2) is wrapped by a little asbestos;
step 215: confirming that no bend radius of the extra-cavity spacer fiber of length JG01 less than 0.05m is present, inserting a first fiber clamping block (38-3);
step 216: and closing the heat preservation door (38-5), and finishing the installation of the tested optical fiber (37).
15. The automatic testing method for the brillouin intensity and frequency shift strain temperature coefficient according to claim 13, characterized in that: in step 106, the specific steps of the automatic positioning function of the optical fiber TFUT and the strain coefficient measured optical fiber SFUT are as follows:
step 301: reading related data of an optical fiber strain temperature coefficient test platform (38) through a communication interface (38-1), wherein the related data comprises opening state data LCKG [ 0-3 ] of a limit switch group (38-2-3-2), a limit switch group (38-2-4-2), a limit switch group (38-2-5-2), and limit switch group (38-2-6-2), single-stage extension length SCL, 5 th-stage constant temperature cavity length DJSCL5, 0 th-stage constant temperature cavity length DJSCL0, uniform temperature HWQ of 6 constant temperature intercommunicated cavities (38-2-2) - (38-2-7), and uniform temperature TYBWQ of an oil bath variable temperature cavity (38-2-1); calculating the total number of data 1 in the LCKG [ 0-3 ] as the number SCN of the elongation nodes of the thermostatic chamber,
step 302: calculating using constant temperature cavity length SCL ═ DJSCL0+ DJSCL5+ SCN ×. DJSCL, calculating single fiber draw FLSL ═ SCL 50 ×. 0.000001, if FLSL ≦ 10 μm then FLSL is 10 μm, setting single temperature change TSJW ═ 5 ℃;
step 303: calculating the SPV15 and SPV13 of the tested optical fiber SFUT at 1550nm and 1310 nm;
step 304: determine "return failure information? "," yes "goes to step 305, and" no "goes to step 306;
step 305: displaying failure information, and rechecking the optical fiber adhesion;
step 306: the temperature coefficient measured optical fiber TFUT is at 1550nm position TPV15 and 1310nm position TPV 13;
step 307: determine "return failure information? "," yes "goes to step 308, and" no "goes to step 309;
step 308: displaying failure information, and rechecking the optical fiber in the oil bath temperature change box (38-13);
step 309: automatically controlling the micro-displacement structure (38-9) to move to enable the optical fiber to be in a critical strain state;
step 310: and the function is finished and success information is returned.
16. The automatic testing method for the brillouin intensity and frequency shift strain temperature coefficient according to claim 13, characterized in that: in step 109, the automatic testing and analyzing function of the strain coefficient and the temperature coefficient includes the following steps:
step 401: reading the SPV15 and SPV13 at 1550nm and the SPV13 at 1310nm of the fiber SFUT, the TPV15 and TPV13 at 1550nm and the TYYBWQ at 1550nm and the uniform temperature of the oil bath temperature-changing cavity (38-2-1), and asking a user to input a displacement interval FLJG with a typical value of 200 mu epsilon SLV and rounding up with a unit of mu m; calculating the strain displacement number NN to be 5000/FLSL and rounding downwards; please the user to enter a temperature ramp interval TUSW, typically 5 ℃ and rounded up to a minimum of 2 ℃; calculating the temperature rise times MM ═ 120-TYBWQ)/TUSW and rounding downwards;
step 402: initializing 1310 strength strain coefficient temporary arrays DATAPS13[ 0-NN ], 1310 strength temperature coefficient temporary arrays DATAPT13[ 0-MM ], 1310 frequency shift strain coefficient temporary arrays DATAFS13[ 0-NN ], 1310 frequency shift temperature coefficient temporary arrays DATAFT13[ 0-MM ], 1550 strength strain coefficient temporary arrays DATAPS15[ 0-NN ], 1550 strength temperature coefficient temporary arrays DATAPT15[ 0-MM ], 1550 frequency shift strain coefficient temporary arrays DATAFS15[ 0-NN ], 1550 frequency shift temperature coefficient temporary arrays DATAFT15[ 0-MM ], temperature record arrays TCURR [ 0-MM ], strain record arrays SCURR [ 0-NN ] with all values of 0, and initializing variable J as 0;
step 403: starting a test system for single test, reading 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], 1310 Brillouin intensity data DATABPO13[ 0-N ], 1550 Brillouin intensity data DATABPO15[ 0-N ];
step 404: DATAPS13[ J ] ═ DATABPO13[ SPV13], DATAFS13[ J ] ═ DATACF13[ SPV13], DATAPS15[ J ] ═ DATABPO15[ SPV15], DATAFS15[ J ] ═ DATACF15[ SPV15], DATAPT13[ J ] ═ DATABPO13[ TPV13], DATAFT13[ J ] ═ DATACF13[ TPV13], DATAPT15[ J ] ═ DATABPO15[ TPV15], DATAFT15[ J ] ═ DATACF15[ TPV15], J = 1;
step 405: calculating the current strain SCURR _ SFUT (J) FLJG/SLV of the measured optical fiber SFUT with the strain coefficient, and calculating the current temperature TCURR _ TFUT (TYYBWQ) of the measured optical fiber TFUT with the temperature coefficient;
step 406: controlling a micro-displacement mechanism (38-9) in an optical fiber strain temperature coefficient test platform (38) to stretch an optical fiber to tighten the optical fiber, wherein the moving distance is FLSL;
step 407: starting a test system for single test, and reading 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], 1310 Brillouin intensity data DATABPO13[ 0-N ], 1550nm Brillouin spectrum center frequency data DATABPO15[ 0-N ]1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ];
step 408: DATAPS13[ J ] ═ DATABPO13[ SPV13], DATAFS13[ J ] ═ DATACF13[ SPV13], DATAPS15[ J ] ═ DATABPO15[ SPV15], DATAFS15[ J ] ═ DATACF15[ SPV15], SCURR [ J ] ═ SCURR _ SFT;
step 409: judging J < NN, "yes" to proceed to step 410; NO goes to step 411;
step 410: j +1, go to step 406;
step 411: setting the temperature of an oil bath variable temperature cavity (38-2-1) as MBWD ═ TYBWQ + TUSW, and continuously reading TYBWQ until TYBWQ is equal to MBWD and lasts for 5 minutes;
step 412: starting a single test of the test system, specifically referring to step 501, reading 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], 1310 Brillouin intensity data DATABPO13[ 0-N ], 1550 Brillouin intensity data DATABPO15[ 0-N ]1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], and initializing J to 1;
step 413: DATAPT13[ J ] ═ DATABPO13[ TPV13], DATAFT13[ J ] ═ DATACF13[ TPV13], DATAPT15[ J ] ═ DATABPO15[ TPV15], DATAFT15[ J ] ═ DATACF15[ TPV15], TCURR [ J ] ═ TCURR _ TFUT;
step 414: determining J < MM, yes to proceed to step 415, no to proceed to step 416;
step 415: j ═ J +1, go to step 411;
step 416: using SCURR [ 0-NN ] as x-axis data, and using DATAPS13[ 0-NN ], DATAFS13[ 0-NN ], DATAPS15[ 0-NN ], DATAFS15[ 0-NN ] as y-axis data to perform linear fitting calculation to obtain 1310 strength strain coefficient PS13, 1310 frequency shift strain coefficient FS13, 1550 strength strain coefficient PS15 and 1550 frequency shift strain coefficient FS 15;
step 417: TCURR [ 0-MM ] is taken as x-axis data, DATAPT13[ 0-MM ], DATAFT13[ 0-MM ], DATAPT15[ 0-MM ], and DATAFT15[ 0-MM ] are respectively taken as y-axis data to perform linear fitting calculation to obtain 1310 strength temperature coefficient PT13, 1310 frequency shift temperature coefficient FT13, 1550 strength temperature coefficient PT15 and 1550 frequency shift temperature coefficient FT 15.
17. The automatic testing method for the brillouin intensity and frequency shift strain temperature coefficient according to claim 16, wherein: in steps 403 and 407, the specific steps of the single test function of the test system are as follows:
step 501: inputting a pulse width PW, a 1550nm refractive INDEX INDEX15 of the measured optical fiber, a 1310nm refractive INDEX INDEX13 of the measured optical fiber, a measuring range RP, a starting frequency FS, a stopping frequency FE, a frequency interval FA, an accumulation frequency AT, a distance resolution SR and other test parameters by a user, wherein the number N of distance acquisition data is RP/SR, and starting a test;
step 502: reading test parameters, calculating single test time TU (2) INDEX15 RP/vacuum light speed C according to the measuring range RP and the refractive INDEX IN of the measured optical fiber, determining sampling interval time TS according to the distance resolution SR, and calculating the number M of frequency acquisition data (FE-FS)/FA;
step 503: starting a 1310nm ultra-narrow line width light source (3) and a 1550nm ultra-narrow line width light source (20), assigning a local oscillation signal frequency BZF as FS, and setting the BZF to a first local oscillation module (11) and a second local oscillation module (29);
step 504: 1310 Brillouin spectrum test data DATABS13[ 0-M ] [ 0-N ] is assigned to 0, 1310 Brillouin intensity test data DATABP13[ 0-N ] is assigned to 0, 1550 Brillouin spectrum test data DATABS15[ 0-M ] [ 0-N ] is assigned to 0, 1550 Brillouin intensity test data DATABP15[ 0-N ] is assigned to 0, and frequency count FIN is assigned to 0;
step 505: assigning the cumulative number counter ATT to 0, assigning 1310 single Brillouin spectrum data DATABSO13[ 0-N ] to 0, assigning 1310 single Brillouin intensity data DATABPO13[ 0-N ] to 0, assigning 1550 single Brillouin spectrum data DATABSO15[ 0-N ] to 0, and assigning 1550 single Brillouin intensity data DATABPO15[ 0-N ] to 0;
step 506: starting a timing sequence timing TQ, starting a first local oscillator module (11) and a second local oscillator module (29), starting a 1310nm pulse modulation module (5) and a 1550nm pulse modulation module (22) to realize generation of a single test detection pulse, simultaneously starting a first high-speed sampling module (14), acquiring 1310 temporary Brillouin spectrum data DATABSO13T [ 0-N ], starting a second high-speed sampling module (15), acquiring 1310 temporary Brillouin intensity data DATABPO13T [ 0-N ], starting a third high-speed sampling module (31), acquiring 1550 temporary Brillouin data DATABSO15T [ 0-N ], starting a fourth high-speed sampling module (32), and acquiring 1550 temporary Brillouin intensity data DATABPO15T [ 0-N ];
step 507: waiting for the timing value of the timing sequence timing TQ to reach the single test time TU, and stopping the first high-speed sampling module (14), the second high-speed sampling module (15), the third high-speed sampling module (31) and the fourth high-speed sampling module (32);
step 508: 1310 single brillouin spectral data:
DATABSO13[0 to N ] ═ DATABSO13[0 to N ] + DATABSO13T [0 to N ], 1310 single brillouin intensity data DATBPRO13[0 to N ] ═ DATABSO13[0 to N ] + DATABSO13T [0 to N ], DATABSO15[0 to N ] ═ DATABSO15[0 to N ] + DATABSO15T [0 to N ], 1550 single brillouin intensity data DATABSO15[0 to N ] = DATABSO15[0 to N ] + DATABSO15T [0 to N ];
step 509: judging that ATT is larger than or equal to AT, carrying out step 511 if yes, and carrying out step 510 if no;
step 510: ATT ═ ATT + 1;
step 511: DATABS13[ FIN ] [ 0-N ] ═ DATABSO13[ 0-N ],
DATABP13[0～N]＝DATABP13[0～N]+DATABPO13[0～N]，
DATABS15[FIN][0～N]＝DATABSO15[0～N]，
DATABP15[0～N]＝DATABP15[0～N]+DATABPO15[0～N]；
step 512: assigning the local oscillation signal frequency BZF as BZF + FA, setting the BZF to a first local oscillation module (11) and a second local oscillation module (29), and setting FIN to FIN + 1;
step 513: judging whether BZF is larger than or equal to FE; "yes" goes to step 514, and "no" goes to step 505;
step 514: lorentz fitting is carried out on DATABS13[ 0-M ] [ 0-N ] and DATABS15[ 0-M ] [ 0-N ] according to distance point distribution to obtain 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ];
step 515: outputting DATACF13[ 0-N ], DATABP13[ 0-N ], DATABP15[ 0-N ] and DATACF15[ 0-N ] to a display interface, and ending the test.
18. The automatic testing method for the brillouin intensity and frequency shift strain temperature coefficient according to claim 15, wherein: in step 303, the specific steps of the automatic positioning function of the SFUT optical fiber with the strain coefficient measured are as follows:
step 601: reading an effective change threshold multiple ACTH (percent of total number of pixels) to be 5, calculating an effective change threshold window width multiple ACTHWT (percent of total number of pixels) to be 10/SCL, calculating a judgment window length PDWL (percent of total number of pixels) to be SCL/SR, performing initialization judgment at 1310nm to judge a value of an array ISCHANGE13[ 0-N ] to be 0, performing initialization judgment at 1550nm to judge a value of an array ISCHANGE15[ 0-N ] to be 0, and performing initialization variable J to be 0;
step 602: starting a test system for single test, reading 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], 1310 Brillouin intensity data DATABPO13[ 0-N ], 1550 Brillouin intensity data DATABPO15[ 0-N ];
step 603: 1310nm Brillouin spectrum center frequency BASE data DATACF13_ BASE [ 0-N ] ═ DATACF13[ 0-N ]1550nm Brillouin spectrum center frequency BASE data DATACF15_ BASE [ 0-N ] ═ DATACF15[ 0-N ];
step 604: controlling a micro-displacement mechanism (38-9) in an optical fiber strain temperature coefficient test platform (38) to stretch an optical fiber, wherein the stretching length of the optical fiber is FLSL;
step 605: starting a test system for single test, and reading 1310nm Brillouin spectrum central frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum central frequency data DATACF15[ 0-N ];
step 606: calculating 1310nm Brillouin spectrum center frequency change data DATACF13_ DIFF [ 0-N ] ═ DATACF13[ 0-N ] -/DATACF 13_ BASE [ 0-N ]; calculating 1550nm Brillouin spectrum center frequency change data DATACF15_ DIFF [ 0-N ] ═ DATACF15[ 0-N ] -/DATACF 15_ BASE [ 0-N ], and initializing variable I to 0;
step 607: calculating the standard deviation of STD13 ═ DATACF13_ DIFF [ I-I + PDWL: ] and STD15 ═ DATACF15_ DIFF [ I-I + PDWL: ] respectively;
step 608: judging DATACF13_ DIFF [ I ] > STD13 _ ACTH, if yes, performing step 609, and if no, performing step 610;
step 609: ISCHANGE13[ I ] ═ ISCHANGE13[ I ] + 1;
step 610: determining DATACF15_ DIFF [ I ] > STD15 × ACTH, yes to perform step 613, no to perform step 611;
step 611: i ═ I + 1;
step 612: determine I > N, "Yes" proceeds to step 614, No "proceeds to step 607;
step 613: ISCHANGE13[ I ] ═ ISCHANGE13[ I ] +1, go to step 611;
step 614: determine J <4, "yes" to proceed to step 615, and "no" to proceed to step 616;
step 615: j +1, go to step 604;
step 616: initializing the variable I1 to 0, and performing step 619;
step 617: i1 ═ I1+1, go to step 619;
step 618: determine I1< N, "yes" to proceed to step 617, "no" to proceed to step 635;
step 619: judging ISCHENGE 13[ I1] ≧ 3, "YES" go to step 620, "NO" go to step 618;
step 620: initializing a variable K1 to 1, and performing step 623;
step 621: k1 ═ K1+1, go to step 623;
step 622: decision K1< N, "yes" goes to step 621, "no" goes to step 624;
step 623: judging that ISCHENGE 13[ I1+ K1] is not less than 3, if yes, performing step 622, and if no, performing step 624;
step 624: SPV13 is the median value I1 to I1+ K1, and step 625 is performed;
step 625: the initialization variable I1 is 0;
step 626: judging that ISCHANGE15[ I1] ≧ 3, "YES" go to step 629, "NO" go to step 627;
step 627: determine I1< N, "Yes" goes to step 628, No "goes to step 635;
step 628: i1 ═ I1+1, go to step 626;
step 629: initializing the variable K1 to 1, and performing step 632;
step 630: k1 ═ K1+1, go to step 632;
step 631: judging K1< N, "yes" to proceed to step 630, "no" to proceed to step 633;
step 632: judging that ISCHENGE 15[ I1+ K1] is not less than 3, if yes, executing step 631, and if no, executing step 633;
step 633: SPV15 is the median of I1-I1 + K1;
step 634: the positioning is successful, and the values of the SPV13 and the SPV15 are output;
step 635: and returning failure information when the positioning fails.
19. The automatic testing method for the brillouin intensity and frequency shift strain temperature coefficient according to claim 15, wherein: in step 306, the specific steps of the automatic positioning function of the temperature coefficient measured optical fiber TFUT optical fiber are as follows:
step 701: reading an effective change threshold multiple ACTH (percent of total number of pixels) to be 5, calculating an effective change threshold window width multiple ACTHWT (percent of total number of pixels) to be 10/SCL, calculating a judgment window length PDWL (percent of total number of pixels) to be SCL/SR, performing initialization judgment at 1310nm to judge a value of an array ISCHANGE13[ 0-N ] to be 0, performing initialization judgment at 1550nm to judge a value of an array ISCHANGE15[ 0-N ] to be 0, and performing initialization variable J to be 0;
step 702: starting a test system for single test, specifically referring to step 501, reading 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], 1310 Brillouin intensity data DATABPO13[ 0-N ] and 1550 Brillouin intensity data DATABPO15[ 0-N ];
step 703: 1310nm Brillouin spectrum center frequency BASE data DATACF13_ BASE [ 0-N ] ═ DATACF13[ 0-N ], 1550nm Brillouin spectrum center frequency BASE data DATACF15_ BASE [ 0-N ] ═ DATACF15[ 0-N ];
step 704: reading the uniform temperature TYYBWQ of the oil bath temperature-changing cavity (38-2-1), setting the temperature of the oil bath temperature-changing cavity (38-2-1) as MBWD ═ TYYBWQ + TSJW, and continuously reading TYYBWQ until TYYBWQ is equal to MBWD and lasts for 5 minutes;
step 705: starting a test system for single test, specifically referring to step 501, reading 1310nm Brillouin spectrum central frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum central frequency data DATACF15[ 0-N ];
step 706: calculating 1310nm Brillouin spectrum center frequency change data DATACF13_ DIFF [ 0-N ] ═ DATACF13[ 0-N ] -/DATACF 13_ BASE [ 0-N ]; calculating 1550nm Brillouin spectrum center frequency change data DATACF15_ DIFF [ 0-N ] ═ DATACF15[ 0-N ] -/DATACF 15_ BASE [ 0-N ], and initializing variable I to 0;
step 707: calculating the standard deviation of STD13 ═ DATACF13_ DIFF [ I-I + PDWL ACTHWT ]
STD15 ═ standard deviation of DATACF15_ DIFF [ I to I + PDWL ACTHWT ];
step 708: judging DATACF13_ DIFF [ I ] > STD13 _ ACTH, if yes, performing step 709, and if no, performing step 710;
step 709: ISCHANGE13[ I ] ═ ISCHANGE13[ I ] + 1;
step 710: judging DATACF15_ DIFF [ I ] > STD15 _ ACTH, if yes, performing step 713, and if no, performing step 711;
step 711: i +1, go to step 712;
step 712: judging I > N, if yes, proceeding to step 714, if no, proceeding to step 707;
step 713: ISCHANGE13[ I ] ═ ISCHANGE13[ I ] +1, go to step 711;
step 714: determine J <2, "yes" to proceed to step 715, "no" to proceed to step 716;
step 715: j +1, go to step 704;
step 716: initializing the variable I1 to 0, and performing step 719;
step 717: i1 ═ I1+1, go to step 719;
step 718: determine I1< N, "yes" to proceed to step 717, "no" to proceed to step 735;
step 719: judging ISCHENGE 13[ I1] ≧ 2, "YES" go to step 720, "NO" go to step 718;
step 720: initializing a variable K1 to 1, and performing step 723;
step 721: k1 ═ K1+1, go to step 723;
step 722: determine K1< N, "yes" to proceed to step 721, "no" to proceed to step 724;
step 723: judging that ISCHE 13[ I1+ K1] is not less than 2, if yes, performing step 722, and if no, performing step 724;
step 724: TPV13 is the median value of I1-I1 + K1;
step 725: the initialization variable I1 is 0;
step 726: judging ISCHENGE 15[ I1] ≧ 2, "YES" go to step 729, "NO" go to step 727;
step 727: determine I1< N, "yes" to proceed to step 728, "no" to proceed to step 735;
step 728: i1 ═ I1+1, go to step 726;
step 729: initializing variable K1 to 1, and proceeding to step 732;
step 730: k1 ═ K1+1, proceed to step 732;
step 731: determine K1< N, "yes" to proceed to step 730, "no" to proceed to step 733;
step 732: judging that ISCHE 15[ I1+ K1] is not less than 2, if yes, performing step 731, and if no, performing step 733;
step 733: TPV15 is the median value of I1-I1 + K1;
step 734: if the positioning is successful, outputting the values of TPV13 and TPV 15;
step 735: and returning failure information when the positioning fails.
20. The automatic testing method for the brillouin intensity and frequency shift strain temperature coefficient according to claim 15, wherein: in step 309, the specific steps of the automatic control function of the critical strain state of the fiber SFUT with the measured strain coefficient are as follows:
step 801: reading an effective change threshold multiple ACTH (percent of change) to be 5, calculating an effective change threshold window width multiple ACTHWT to be 10/SCL, calculating a judgment window length PDWL to be SCL/SR, reading strain coefficient tested optical fibers SFUT at 1550nm position SPV15 and 1310nm position SPV13, and initializing an initialization variable J to be 0;
step 802: starting a test system for single test, specifically referring to step 501, reading 1310nm Brillouin spectrum center frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum center frequency data DATACF15[ 0-N ], 1310 Brillouin intensity data DATABPO13[ 0-N ] and 1550 Brillouin intensity data DATABPO15[ 0-N ];
step 803: 1310nm Brillouin spectrum center frequency BASE data DATACF13_ BASE [ 0-N ] ═ DATACF13[ 0-N ]1550nm Brillouin spectrum center frequency BASE data DATACF15_ BASE [ 0-N ] ═ DATACF15[ 0-N ];
step 804: controlling a micro-displacement mechanism (38-9) in the optical fiber strain temperature coefficient test platform (38) to stretch the optical fiber in the opposite direction, so that the optical fiber is relaxed, wherein the moving distance is FLSL, if the boundary limit switch information of the micro-displacement mechanism (38-9) is received in the moving process, the function is finished, and failure information is returned;
step 805: starting a test system for single test, specifically referring to step 501, reading 1310nm Brillouin spectrum central frequency data DATACF13[ 0-N ] and 1550nm Brillouin spectrum central frequency data DATACF15[ 0-N ];
step 806: calculating 1310nm Brillouin spectrum center frequency change data DATACF13_ DIFF [ 0-N ] ═ DATACF13_ BASE [ 0-N ] -DATACF13[ 0-N ]; calculating 1550nm Brillouin spectrum center frequency change data DATACF15_ DIFF [ 0-N ] ═ DATACF15_ BASE [ 0-N ] -DATACF15[ 0-N ], and initializing variable I to 0;
step 807: 1310nm Brillouin spectrum center frequency BASE data DATACF13_ BASE [ 0-N ] ═ DATACF13[ 0-N ]1550nm Brillouin spectrum center frequency BASE data DATACF15_ BASE [ 0-N ] ═ DATACF15[ 0-N ];
step 808: calculating the standard deviation of STD13 ═ DATACF13_ DIFF [ SPV 13-SPV 13+ PDWL ×. ACTHWT ], and STD15 ═ DATACF15_ DIFF [ SPV 15-SPV 15+ PDWL ×. ACTHWT ];
step 809: determining DATACF13_ DIFF [ SPV13] < STD13 × ACTH, yes to proceed to step 810, no to proceed to step 804;
step 810: determining DATACF15_ DIFF [ SPV15] < STD15 × ACTH, yes to proceed to step 811, no to proceed to step 804;
step 811: the automatic operation is successful, the fiber SFUT with the strain coefficient tested is in the critical strain state, and the success information is returned.
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