CN104132622B - Distributed optical fiber deformation tensile instrument and test method - Google Patents
Distributed optical fiber deformation tensile instrument and test method Download PDFInfo
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- CN104132622B CN104132622B CN201410326618.7A CN201410326618A CN104132622B CN 104132622 B CN104132622 B CN 104132622B CN 201410326618 A CN201410326618 A CN 201410326618A CN 104132622 B CN104132622 B CN 104132622B
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Abstract
The invention relates to a distributed optical fiber deformation tensile instrument, and particularly relates to a deformation tensile device used for simulating practical applications of optical fibers at different tensile states. The distributed optical fiber deformation tensile instrument comprises a tensile system and an optical fiber bearing platform. The tensile system and the optical fiber bearing platform are connected. The defect that a conventional optical fiber deformation tensile test instrument cannot simply and accurately monitor the sensing performance of distributed optical fibers under multiple working conditions is overcome. The test device can simply and effectively control the loading progress, and can carry out crack opening development simulation, small strain monitoring and variable-angle variable-elevation multi-condition basic application research through a finally established movable smart tensile platform. The problems such as low optical fiber survival rate, long model making cycle, poor effect and high cost in some indoor simulation tests are avoided. The deformation mechanism and the combination mechanism of a distributed optical fiber monitoring technology under complex load conditions and at various operating state forms can be studied.
Description
Technical field
The present invention relates to a kind of distribution type fiber-optic deformation tensilometer and method of testing, be specifically related to a kind of a kind of deformation stretching device being in actual application ability and simulation practical application under different stretch state for optical fiber.
Background technology
Distributed Optical Fiber Sensing Techniques is constantly expanded as its application of a kind of New Sensing Technology, the sensing capabilities that optical fiber is good is the necessary condition ensureing optical fiber structure health monitoring, and fiber-draw distortion is the important indicator of distributed optical fiber sensing system sensing performance reliability.Optical fiber in practical engineering application because there is the deficiency of survival rate variance in the performance reason of its material own, therefore the process such as deformation failure for optical fiber in its practical application cannot follow the trail of observation, even if laboratory test is also because survival rate is low, the reasons such as model cycle long and device is too rough and simple to its analyze and research lack comprehensive, accuracy and ageing, therefore the complex environment of efficient accurate replica test and convenient simulation multi-state studies the very crucial core technology of distribution type fiber-optic one, need to design a kind of range less, accurately with the manageable deformation stretcher of appearance.
Along with the development in structural health monitoring technology miniaturization, distributed direction, the ability of its monitoring of structures body micro-strain is more and more taken seriously.The stretching servo testing machine of current optical fiber, expensive, complicated operation, take up space greatly and only can carry out the test of homogenous material Properties Tensile, the more difficult tension test accurately carrying out monitoring capability, especially can not simulate the deformation process of optical fiber under multi-state in practical application, hinder its more basic research and application.Present stage, with distributed optical fiber sensing complete sets of Techniques, carry out diversification, systematization, the device of the accurate tension test of multi-state and measuring technology and still belong to blank.
Summary of the invention
The present invention is directed to above-mentioned deficiency and provide a kind of distribution type fiber-optic deformation tensilometer and method of testing.
the present invention adopts following technical scheme:
A kind of distribution type fiber-optic deformation tensilometer of the present invention, comprises tensioning system, bearing optical fiber platform; Described tensioning system is connected with bearing optical fiber platform;
Tensioning system comprises: front support steel plate, movable steel plate, rear support steel plate, connection spreader, handle terminal pad, turning handle, fixing spreader, scale, threaded formula rotate spreader; Described front support steel plate is connected spreader and fixing spreader with being arranged vertically between rear support steel plate, is provided with movable steel plate between front support steel plate and rear support steel plate; Threaded formula is rotated spreader and is run through front support steel plate, and one end of screw-type rotation spreader is threaded with movable steel plate, the other end is provided with turning handle, and turning handle rotates spreader by handle terminal pad with threaded formula and is connected; Connect spreader and be provided with scale;
Bearing optical fiber platform comprises: formula steel column with a scale, adjustable-angle mounting table, stretching end fixture, stiff end fixture; Described formula steel column with a scale is arranged in the top of rear support steel plate, and the top of rear support steel plate is also provided with stiff end fixture; Adjustable-angle mounting table is arranged in the top of movable steel plate, and adjustable-angle mounting table is provided with the end fixture that stretches, and stretches between end fixture and stiff end fixture and places optical fiber.
Distribution type fiber-optic deformation tensilometer of the present invention, described stiff end fixture is nested with on formula steel column with a scale, slides along formula steel column bearing of trend with a scale.
Distribution type fiber-optic deformation tensilometer of the present invention, described adjustable-angle mounting table comprises disk with a scale and screw-type steel column forms; Described disk arranged beneath screw-type steel column with a scale, disk card with a scale is provided with several scale circular holes, and scale circular hole circumferentially arranges centered by circle disk center with a scale.
Distribution type fiber-optic deformation tensilometer of the present invention, also comprises thermometric room; Described thermometric room is arranged on front support steel plate.
Distribution type fiber-optic deformation tensilometer of the present invention; described thermometric indoor are provided with thermometer protective layer; thermometer fixed and is protected in thermometric room, by pressing thermometric room nuts, the tip screw rod of band spring being pressed in threaded buckle, driving the rotation of thermometric room door-plate to close.
Distribution type fiber-optic deformation tensilometer of the present invention, described stretching end fixture comprises the end clamp supporting table that stretches, screw-type steel column two, and the end fixture that stretches rotates spreader, and the end fixture that stretches rotates hand; Formula fiber clamp one with a scale; Groove is provided with in described stretching end clamp supporting table, two pieces of formula fiber clamps one with a scale are provided with in groove, the end fixture rotation spreader that stretches extends in groove from the two ends of the end clamp supporting table that stretches and is connected with formula fiber clamp one with a scale respectively, and the end fixture rotation spreader that stretches is provided with the end fixture that stretches and rotates hand; Stretch and hold clamp supporting table lower end to be provided with screw-type steel column two.
Distribution type fiber-optic deformation tensilometer of the present invention, described stiff end fixture comprises: button pinched by steel plate, and pinch button bolt, canned paragraph fixture rotates spreader, canned paragraph fixture turning handle, formula fiber clamp two with a scale, stiff end clamp supporting table; Stiff end clamp supporting table center is provided with boss, groove is provided with in boss, formula fiber clamp two with a scale is arranged in groove, canned paragraph fixture rotation spreader extends into the groove in boss, and canned paragraph fixture rotation spreader one end is connected with formula fiber clamp two with a scale, the other end arranges canned paragraph fixture turning handle; Two legs are extended in the bottom of stiff end clamp supporting table, and the two ends of two legs are provided with steel plate and pinch button, and steel plate is pinched button and fixed by pinch button bolt and stiff end clamp supporting table.
The method of testing of distribution type fiber-optic deformation tensilometer, testing procedure is as follows:
Step one: assembling, commissioning device build and adjust stiff end fixture 13 and the stretch height and angle of holding fixture 8;
Step 2: connect the scale on spreader according to the initial gauge length of optical fiber to be tensioned in test and formula with a scale, rotates turning handle and threaded formula is rotated spreader turns to the length consistent with initial gauge length;
Step 3: optical fiber to be tensioned being laid in stiff end fixture according to test objective and stretching and holds in fixture, stretching end fixture and stiff end fixture are kept level, and it is fixing to hold fixture turning handle and stiff end fixture turning handle to be finely tuned by stretching;
Step 4: stretching optical fiber is connected on the optical-fiber deformation monitor based on pre-pumping Brillouin optical time domain analysis technology, and apply tensile load according to test requirements document;
Step 5: by the variations in temperature in the record test of thermometric room, for environment temperature difference, excessive or indoor need keep extended state equitemperature to affect the situation of can not ignore for a long time, the fiber optic temperature change that can monitor according to thermometric room determines in conjunction with fiber optic temperature influence coefficient because the fibre strain value caused by variation of ambient temperature, and then deduction ambient temperature is on the impact of optical fiber, realizes fiber optic temperature compensation process.
Step 6: drive threaded formula to rotate spreader to rotate, by the movement of threads turn and then drive activity plate platform, and then drive the movement of the end fixture that stretches, make optical fiber stretcher strain thereupon by rotating turning handle;
Step 7: use thermometric room monitor temperature result, based on optical fiber Brillouin frequency displacement
change and temperature
change relevant, and have good linear relationship, be formulated as
, namely can be write as
, wherein,
,
for temperature is
tand
t 0 time Brillouin shift amount,
for Brillouin's temperature coefficient,
be the change value of the test specimen optical fiber section of being stretched temperature,
for Brillouin shift variable quantity caused by variations in temperature; The Brillouin shift value utilizing above-mentioned formula can calculate optical fiber ambient temperature now to cause, and then according to
can draw
, and then can draw
, finally can draw
, finally calculate because the deformation value caused by extraneous tensile load, wherein,
brillouin shift variable quantity caused by Yin Wendu and strain variation,
for Brillouin shift variable quantity caused by strain variation,
for the coefficient of strain,
for being caused strain value.
beneficial effect
The invention solves conventional optical-fiber deformation tensile test device can not be simple, accurately and under multi-state, monitor the shortcoming of distributing optical fiber sensing performance, this testing arrangement can controlled loading progress simply and effectively, the development of simulation fracture aperture can be carried out by the removable dexterous formula stretching platform finally set up, small strain monitoring and varied angle uprise the base application research of journey multi-state, avoid optical fiber survival rate in some simulation laboratory tests low, the modelling cycle is long, the problems such as weak effect and expense height, and then distributed optical fiber sensing technology can be studied in Complicated Loads condition and the pro forma deformation mechanism of various working and combination mechanism, it can be generalized in practical engineering application.
This tester is utilized to achieve small strain and the small strain monitoring of structure in conjunction with pre-pumping brillouin distributed optical fiber sensing technology, significant for every researchs such as distribution type fiber-optic performances by means of apparatus of the present invention, it has the advantages such as light and handy, nimble, low manufacturing cost, operating mode little by external interference, capable of being combined is many, the scope of application is wide.
Accompanying drawing explanation
Fig. 1 is the front view of deformation stretching device of the present invention;
Fig. 2 is adjustable-angle mounting table detail structure chart in deformation stretching device of the present invention;
Fig. 3 is the end fixture detail structure chart that stretches in deformation stretching device of the present invention;
Fig. 4 is thermometric room detail structure chart in deformation stretching device of the present invention;
Fig. 5 is stiff end fixture detail structure chart in deformation stretching device of the present invention.
In figure, 1 is front support plate platform; 2 is activity plate platform; 3 is rear support plate platform; 4 is connect spreader; 5 is spreader nuts; 6 is formula steel columns with a scale; 7 is adjustable-angle mounting tables; 8 is the end fixtures that stretch; 9 is handle terminal pads; 10 is turning handles; 11 is fixing spreaders; 12 is scales; 13 is stiff end fixtures; 14 is thermometric rooms; 15 is fix to use spreader nuts; 16 is that threaded formula rotates spreader; 17 is band angled type disks, and 18 is screw-type steel columns 1; 19 is screw-type steel columns two; 20 is the end fixture rotation spreaders that stretch; 21 is the end fixture turning handles that stretch; 22 is formula fiber clamps one with a scale; 23 is the end clamp supporting tables that stretch; 24 is thermometric room nuts; 25 is springs; 26 is tip screw rods; 27 is thermometer protective layers; 28 is thermometers; 29 is threaded buckles; 30 is that button pinched by steel plate; 31 is pinch button bolt; 32 is pinch button nuts; 33 is that stiff end fixture rotates spreader; 34 is stiff end fixture turning handles; 35 is formula fiber clamps two with a scale; 36 is stiff end clamp supporting tables; 37 is optical fiber to be tensioned, and 40 is thermometric room door-plates.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in more detail:
As shown in the figure: a kind of distribution type fiber-optic deformation tensilometer and method of testing, it is made up of tensioning system and bearing optical fiber platform two large divisions, wherein, the chief component of tensioning system is: front support steel plate 1, movable steel plate 2, rear support steel plate 3, connect spreader 4, spreader nuts 5, handle terminal pad 9, turning handle 10, fixing spreader 11, scale 12, fixing spreader nuts 15, threaded formula rotate spreader 16 etc.;
The chief component of bearing optical fiber platform is: formula steel column 6 with a scale, adjustable-angle mounting table 7, stiff end fixture 13, stretching end fixture 8 etc., front support steel plate 1, movable steel plate 2 and rear support steel plate 3 are distributed with the circular hole of different size, connection spreader 4 being connected spreader 12 with formula with a scale crosses in front support steel plate 1 respectively, the top circular hole of movable steel plate 2 and rear support steel plate 3, use to fix and with spreader 11, front support steel plate 1 is connected with rear support steel plate 3, and use spreader nuts 5 and fixing spreader nuts 15 by its each self-retaining, use threaded formula to rotate spreader 16 and be communicated with front support steel plate 1 and movable steel plate 2, threaded formula is rotated spreader 16 and is connected with turning handle 10 by handle terminal pad 9, adjustable-angle mounting table 7 and formula steel column 6 with a scale are individually fixed in movable steel plate 2 and rear support steel plate 3, optical fiber 37 to be tensioned is positioned over stretch end fixture 8 and stiff end fixture (13) place.
Each assembly all can carry out free assembly and disassembly, to be convenient for changing and to reequip test further.The mounting table of other types can be replaced with in order to completing the different demand of various test when other test requirements documents for adjustable-angle mounting table 7.Formula with a scale connects the basic physical size that spreader 12 is used for indicating optical fiber 37 to be tensioned.
This testing arrangement not only can testing level to fiber-draw, can also test different elevation surface thereof stretch.The steel plate of stiff end fixture 13 pinched buckle 30 by pinching button bolt 31 and be connected to formula steel column 6 with a scale, and use and pinch a button nuts 32 and be fixed.Formula steel column 6 with a scale can realize different elevation surface thereof according to fixed position difference stretch, be optical fiber horizontal stretching place in the position that stiff end fixture 13 contacts with rear support plate platform 3.
This testing arrangement can also carry out the extension test on optical fiber different directions.Adjustable-angle mounting table 7 is laid with 8 angle circular holes at 45 °, sign 0 ~ 360 ° of interval, in disc centre, place arranges center hole, and it is optical fiber horizontal stretch position place.Adjustable-angle mounting table 7 is made up of band angled type disk 17 and screw-type steel column 1.For the requirement of different tests, stretching end fixture 8 can be fixed in different angles circular hole place by screw-type steel column 2 19.The deformation extended state in horizontal stretch or the different incline direction that may exist and different angles can be subject in local in analog optical fiber practical application.
Distance between adjustment activity steel plate 2 and rear support steel plate 3, realizes the simulation of Crack Monitoring process.And optical fiber to be layed in wherein by analogue formation and then to monitor the method in crack by tradition, there is the problems such as single test specimen nonrepeatability, modelling cycle long and expense is high in it.Use formula with a scale to connect spreader 12 and demarcate good distance between movable steel plate 2 and rear support steel plate 3 in advance, and it can be used as crack initial value, to re-use when its distance is pulled open by turning handle 10 can simulation fracture constantly expand until optical fiber break by excessive fracture aperture and the process destroyed, being combined adjustable-angle mounting table 7 can the deformation mechanism of analog optical fiber different angles when crossing crack.
This testing arrangement utilizes thermometric room 14 can the change of monitoring of environmental amount temperature.When analytical calculation fiber-draw strains, the monitoring result of thermometric room 14 can be calculated as temperature-compensating and use.Thermometer 28 is fixed and is protected in thermometric room 14 by thermometer protective layer 27; by pressing thermometric room nuts 24, the tip screw rod 26 of band spring 25 is pressed in threaded buckle 29; drive the rotation of thermometric room door-plate 40 to close, it can play the effect of protective separation to thermometric room 14.
Stiff end fixture 13 and the end fixture 8 that stretches of this testing arrangement are different, for stiff end fixture 13, it is the external formula fiber clamp 2 35 with a scale of stiff end clamp supporting table 36 with certain altitude, rotate stiff end fixture rotation spreader 33 by stiff end fixture turning handle 34 and finely tune its width, and external formula fiber clamp 2 35 inner surface with a scale carries out the sign of grooving process and center scale.The end fixture 8 that stretches settles formula fiber clamp 1 with a scale by the end clamp supporting table 23 that stretches, rotate spreader 20 by the end fixture turning handle 21 circumgyration stretch end fixture that stretches and finely tune its width, and be fixed on band angled type disk 17 by screw-type steel column 2 19.
The present embodiment will for SMF-28e general single mode fiber as optical fiber 37 to be tensioned, the method for testing of distribution type fiber-optic Deformation Behavior under test deformation stretching condition:
Step one: assembling, commissioning device build and adjust stiff end fixture 13 and the stretch height and angle of holding fixture 8.
Step 2: connect the scale on spreader 12 according to the initial gauge length of optical fiber 37 to be tensioned in test and formula with a scale, rotates turning handle 10 and threaded formula is rotated spreader 16 turns to the length consistent with initial gauge length.
Step 3: optical fiber 37 to be tensioned is laid in stiff end fixture 13 according to test objective and stretches in end fixture 8, stretching end fixture 8 and stiff end fixture 13 are kept level, and it is fixing to hold fixture turning handle 21 and stiff end fixture turning handle 34 to be finely tuned by stretching.
Step 4: by stretching optical fiber 37 port along receiving on optical fiber information collecting device, and apply tensile load according to the test requirements document of setting;
Step 5: record the variations in temperature in test by thermometric room 14, the situation excessive for temperature contrast or indoor need to keep for a long time the test under extended state to need to consider temperature compensation effect.
Step 6: drive threaded formula rotation spreader 16 to rotate by rotating turning handle 10, by the movement of threads turn and then drive activity plate platform 2, and then drive the movement of the end fixture that stretches, make optical fiber stretcher strain thereupon, and by monitoring its stretcher strain amount based on the fiber optic monitoring technology of pre-pumping Brillouin optical time domain analysis.
Step 7: use thermometric room 14 monitor temperature result, based on optical fiber Brillouin frequency displacement
change and temperature
change relevant, and have good linear relationship, be formulated as
, namely can be write as
, wherein,
for Brillouin shift variable quantity caused by variations in temperature,
,
be divided into temperature
and initial temperature
under the value of Brillouin shift,
for temperature coefficient,
be the change value of the test specimen optical fiber section of being stretched temperature, the Brillouin shift value utilizing above-mentioned formula can calculate optical fiber ambient temperature now to cause, and then according to
can draw
, and then can draw
, finally calculate because the deformation value caused by extraneous tensile load, wherein
for the coefficient of strain,
for being caused strain value.
As mentioned above, although represented with reference to specific preferred embodiment and described the present invention, it shall not be construed as the restriction to the present invention self.Under the spirit and scope of the present invention prerequisite not departing from claims definition, can make a variety of changes in the form and details it.
Claims (7)
1. a distribution type fiber-optic deformation tensilometer, is characterized in that: comprise tensioning system, bearing optical fiber platform; Described tensioning system is connected with bearing optical fiber platform;
Tensioning system comprises: front support steel plate (1), movable steel plate (2), rear support steel plate (3), connection spreader (4), handle terminal pad (9), turning handle (10), fixing spreader (11), scale (12), threaded formula rotate spreader (16); Described front support steel plate (1) is connected spreader (4) and fixing spreader (11) with being arranged vertically between rear support steel plate (3), is provided with movable steel plate (2) between front support steel plate (1) and rear support steel plate (3); Threaded formula is rotated spreader (16) and is run through front support steel plate (1), screw-type rotate spreader (16) one end is threaded with movable steel plate (2), the other end is provided with turning handle (10), turning handle (10) rotates spreader (16) by handle terminal pad (9) and threaded formula and is connected; Connect spreader (4) and be provided with scale (12);
Bearing optical fiber platform comprises: formula steel column (6) with a scale, adjustable-angle mounting table (7), stretching end fixture (8), stiff end fixture (13); Described formula steel column (6) with a scale is arranged in the top of rear support steel plate (3), and the top of rear support steel plate (3) is also provided with stiff end fixture (13); Stiff end fixture (13) is nested with on formula steel column (6) with a scale, slides along formula steel column (6) bearing of trend with a scale; Adjustable-angle mounting table (7) is arranged in the top of movable steel plate (2), and adjustable-angle mounting table (7) is provided with end fixture (8) that stretches, and stretches between end fixture (8) and stiff end fixture (13) and places optical fiber (37).
2. distribution type fiber-optic deformation tensilometer according to claim 1, is characterized in that: described adjustable-angle mounting table (7) comprises disk with a scale (17) and forms with screw-type steel column (18); Described disk with a scale (17) arranged beneath screw-type steel column (18), disk with a scale (17) card is provided with several scale circular holes, and scale circular hole circumferentially arranges centered by disk with a scale (17) center of circle.
3. distribution type fiber-optic deformation tensilometer according to claim 1, is characterized in that: also comprise thermometric room (14); Described thermometric room (14) is arranged on front support steel plate (1).
4. distribution type fiber-optic deformation tensilometer according to claim 3; it is characterized in that: be provided with thermometer protective layer (27) in described thermometric room (14) and thermometer (28) fixed and is protected in thermometric room (14); by pressing thermometric room nuts (24), the tip screw rod (26) with spring (25) is pressed in threaded buckle (29), drives the rotation of thermometric room door-plate (40) to close.
5. distribution type fiber-optic deformation tensilometer according to claim 1, it is characterized in that: described stretching end fixture (8) comprises end clamp supporting table (23) that stretches, screw-type steel column two (19), the end fixture that stretches rotates spreader (20), and stretch end fixture turning handle (21); Formula fiber clamp one (22) with a scale; Groove is provided with in described stretching end clamp supporting table (23), two pieces of formula fiber clamps one (22) with a scale are provided with in groove, end fixture rotation spreader (20) that stretches extends in groove from the two ends of end clamp supporting table (23) that stretches and is connected with formula fiber clamp one (22) with a scale respectively, and end fixture rotation spreader (20) that stretches is provided with end fixture turning handle (21) that stretches; Stretch and hold clamp supporting table (23) lower end to be provided with screw-type steel column two (19).
6. distribution type fiber-optic deformation tensilometer according to claim 1, it is characterized in that: described stiff end fixture (13) comprising: button (30) pinched by steel plate, pinch button bolt (31), stiff end fixture rotates spreader (33), stiff end fixture turning handle (34), formula fiber clamp two (35) with a scale, stiff end clamp supporting table (36); Stiff end clamp supporting table (36) center is provided with boss, groove is provided with in boss, formula fiber clamp two (35) with a scale is arranged in groove, stiff end fixture rotation spreader (33) extends into the groove in boss, and stiff end fixture rotation spreader (33) one end is connected with formula fiber clamp two (35) with a scale, the other end arranges stiff end fixture turning handle (34); Two legs are extended in the bottom of stiff end clamp supporting table (36), and the two ends of two legs are provided with steel plate and pinch button (30), and steel plate is pinched button (30) and fixed with stiff end clamp supporting table (36) by pinching button bolt (31).
7. the method for testing of distribution type fiber-optic deformation tensilometer as claimed in claim 1, is characterized in that: testing procedure is as follows:
Step one: assembling, commissioning device build and adjust height and the angle of stiff end fixture (13) and end fixture (8) that stretches;
Step 2: according to the scale on the initial gauge length of optical fiber to be tensioned (37) in test and the connection spreader (4) of (12) with a scale, rotates turning handle (10) and threaded formula rotation spreader (16) is turned to the length consistent with initial gauge length;
Step 3: optical fiber to be tensioned (37) is laid in stiff end fixture (13) according to test objective and stretches in end fixture (8), stretching end fixture (8) and stiff end fixture (13) are kept level, and it is fixing to hold fixture turning handle (21) and stiff end fixture turning handle (34) to be finely tuned by stretching;
Step 4: by stretching optical fiber (37) port along receiving on optical fiber information collecting device, and apply tensile load according to the test requirements document of setting;
Step 5: by the variations in temperature in the test of thermometric room (14) record, for environment temperature difference, excessive or indoor need keep extended state equitemperature to affect the situation of can not ignore for a long time, the fiber optic temperature change that can monitor according to thermometric room (14) determines in conjunction with fiber optic temperature influence coefficient because the fibre strain value caused by variation of ambient temperature, and then deduction ambient temperature is on the impact of optical fiber, realizes fiber optic temperature compensation process;
Step 6: drive threaded formula to rotate spreader (16) to rotate, by the movement of threads turn and then drive activity plate platform (2), and then drive the movement of the end fixture that stretches, make optical fiber stretcher strain thereupon by rotating turning handle (10);
Step 7: use thermometric room (14) monitor temperature result, according to formula
finally calculate because the deformation value caused by extraneous tensile load;
Wherein,
brillouin shift variable quantity caused by Yin Wendu and strain variation,
for Brillouin shift variable quantity caused by variations in temperature,
for the coefficient of strain,
for being caused strain value;
tfor temperature.
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| CN105910992A (en) * | 2016-05-06 | 2016-08-31 | 河海大学 | Concrete damage dynamic diagnosis system and method based on distributed sensing optical fiber |
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| CN106931898B (en) * | 2017-05-18 | 2019-06-18 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of strain measurement method under the hot environment based on fibre optical sensor |
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| EP0621469B1 (en) * | 1993-04-20 | 1997-12-03 | HONIGMANN INDUSTRIELLE ELEKTRONIK GmbH | Tensile force measuring apparatus |
| KR100211034B1 (en) * | 1996-12-20 | 1999-07-15 | 이계철 | Mechanical property complex testing device of optical connector |
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| CN204007534U (en) * | 2014-07-10 | 2014-12-10 | 河海大学 | A kind of distribution type fiber-optic deformation tensilometer |
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| CN105910992A (en) * | 2016-05-06 | 2016-08-31 | 河海大学 | Concrete damage dynamic diagnosis system and method based on distributed sensing optical fiber |
| CN105910992B (en) * | 2016-05-06 | 2017-05-03 | 河海大学 | Concrete damage dynamic diagnosis system based on distributed sensing optical fiber |
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