CN215910048U - Testing device of optical fiber F-P type high-temperature pressure sensor - Google Patents
Testing device of optical fiber F-P type high-temperature pressure sensor Download PDFInfo
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- CN215910048U CN215910048U CN202122183689.4U CN202122183689U CN215910048U CN 215910048 U CN215910048 U CN 215910048U CN 202122183689 U CN202122183689 U CN 202122183689U CN 215910048 U CN215910048 U CN 215910048U
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Abstract
The utility model provides a testing device of an optical fiber F-P type high-temperature pressure sensor. The testing device comprises a signal processing device, a high-temperature furnace and a pneumatic pump, wherein the high-temperature furnace is connected with the pneumatic pump through a connecting steel pipe, a first pressure gauge and a through ball valve are arranged on the connecting steel pipe, and the connecting steel pipe extends into a heating hearth of the high-temperature furnace; the detection end of the optical fiber F-P type high-temperature pressure sensor to be detected extends into a connecting steel pipe arranged in a heating hearth of the high-temperature furnace from the other side of the high-temperature furnace and is hermetically connected with the port of the connecting steel pipe through a connecting interface, and the sensitive point of the optical fiber F-P type high-temperature pressure sensor to be detected is arranged in the heating zone of the high-temperature furnace; the tail fiber end extends out of the high-temperature furnace and is connected with an optical signal of the signal processing device; and the first pressure gauge on the connecting steel pipe is connected with an electric signal of the signal processing device. The utility model has convenient integral construction and simple operation, and effectively solves the difficult point of pressure sensor calibration under high temperature condition.
Description
Technical Field
The utility model belongs to the field of optical fiber sensing, and relates to a testing device of an optical fiber F-P type sensor under the conditions of high temperature and high pressure.
Background
With the continuous progress of economic strength of China and the continuous improvement of comprehensive national strength, the requirements of pressure measurement in high-temperature environments in the fields of military, aerospace, automobile industry, metallurgy and chemical engineering and the like are continuously increased. For example, inside the combustion chamber of an automobile engine, the temperature can reach over 600 ℃; the high pressure generated by the high temperature in the combustion chamber is an important cause of unstable combustion, which may affect the performance of the engine if the unstable combustion is light and may cause serious accidents if the unstable combustion is heavy, and thus, the method has important significance for online measurement of the internal pressure of the combustion chamber. In addition, in the field of metallurgy and chemical industry, the maximum design temperature of a furnace tube of the hydrogen production converter is 900 ℃, and the pressure reaches 3.4 MPa. Such industrial applications require sensing test equipment that can withstand high temperatures and pressures.
Based on the above requirement for direct measurement of pressure in high temperature environment, various types of pressure sensors have been developed, wherein piezoresistive/piezoelectric type, microwave resonant type, and other pressure sensors have problems of transmission and extraction of electrical signals at high temperature; the optical fiber sensor becomes a research hotspot because of the advantages of electromagnetic interference resistance, high measurement precision, high temperature resistance, corrosion resistance and the like, and particularly, the optical fiber F-P type pressure sensor has the advantages of simple and reliable physical structure, extremely small size and the like, and is particularly suitable for working in severe environments such as high temperature, high pressure, corrosion, radiation and the like.
However, currently, research work on a testing device and a coefficient calibration method of an optical fiber F-P type pressure sensor in a high-temperature environment is few, and some obvious defects exist. For example, the interfaces of the sensor and the testing device are mostly fixed by high-temperature sealant, so that the problems of difficulty in disassembly, easiness in damaging the sensor and the like exist; in addition, in the aspect of high-temperature pressure coefficient calibration, no relevant standard exists at present, and the problem of cross sensitivity of the temperature and the pressure of the F-P cavity of the optical fiber is easily ignored.
Disclosure of Invention
The utility model provides a testing device of an optical fiber F-P type high-temperature pressure sensor, aiming at the problems of testing and coefficient calibration of the optical fiber F-P type pressure sensor under the existing high-temperature condition.
In order to achieve the above object, the present invention provides a testing device for an optical fiber F-P type high temperature pressure sensor, which is characterized in that: the testing device comprises a signal processing device, a high-temperature furnace and a pneumatic pump, wherein the high-temperature furnace is connected with the pneumatic pump through a connecting steel pipe, one end of the connecting steel pipe extends into a heating hearth of the high-temperature furnace from one side of the high-temperature furnace, the other end of the connecting steel pipe is hermetically communicated with a pneumatic output interface of the pneumatic pump, and a first pressure gauge and a direct ball valve are arranged on the connecting steel pipe; the detection end of the optical fiber F-P type high-temperature pressure sensor to be detected extends into a connecting steel pipe arranged in a heating hearth of the high-temperature furnace from the other side of the high-temperature furnace and is in sealing connection with a port of the connecting steel pipe through a connecting interface, the sensitive point of the optical fiber F-P type high-temperature pressure sensor to be detected is arranged in a heating area of the heating hearth of the high-temperature furnace, and the tail fiber end extends out of the high-temperature furnace and is connected with the optical signal input end of the signal processing device; and the first pressure gauge connected with the steel pipe is connected with an electric signal of the signal processing device.
The further technical scheme of the utility model is as follows: the signal processing device comprises an optical fiber demodulation module, an industrial personal computer and a pressure acquisition module; the tail fiber of the optical fiber F-P type high-temperature pressure sensor to be detected is connected with the optical signal input end of the optical fiber demodulation module through an optical connector; the optical fiber demodulation module is used for acquiring a spectrum change signal caused by the change of the F-P cavity length of the sensor caused by pressure and outputting the spectrum change signal to the industrial personal computer, and the industrial personal computer performs software processing of the upper computer and displays an optical fiber pressure result; the pressure acquisition module is used for reading a voltage pressure signal on the first pressure gauge and inputting the voltage pressure signal to the industrial personal computer, and the industrial personal computer performs signal processing and reference pressure value display.
The further technical scheme of the utility model is as follows: the testing device also comprises an optical fiber temperature sensor, wherein the optical fiber temperature sensor is used for measuring the temperature in the high-temperature furnace; when the optical fiber temperature sensor is used for carrying out temperature calibration and high-temperature and high-pressure simultaneous calibration on the optical fiber F-P type high-temperature pressure sensor to be measured, the optical fiber temperature sensor and the optical fiber F-P type high-temperature pressure sensor to be measured are bundled together and horizontally placed in a heating hearth of a high-temperature furnace, and sensitive points of the optical fiber temperature sensor and the optical fiber F-P type high-temperature pressure sensor to be measured are both placed in a heating zone of the high-temperature furnace; the optical fiber temperature sensor and the optical fiber F-P type high-temperature pressure sensor to be detected are both screwed up and hermetically connected with the connecting steel pipe through the straight-through interface, and the tail fibers of the two sensors are both connected with the signal input end of the signal processing device through the optical fiber connector.
The utility model has the following excellent technical scheme: the high-temperature furnace is used for providing a heat source, and the highest temperature of the high-temperature furnace reaches 1000 ℃; a horizontally arranged heating hearth is arranged in the high-temperature furnace, a heat-insulating layer is arranged on the inner wall of the heating hearth, furnace plugs with through holes are respectively arranged at the inlet end and the outlet end of the heating hearth, a quartz tube is arranged at the through hole, and the inner diameter of the quartz tube is matched with the outer diameter of the connecting steel tube; the connecting steel pipe extends into the heating hearth from the inlet end of the heating hearth, and the end part of the connecting steel pipe penetrates through the heating hearth and extends out of the outlet end of the heating hearth; the connecting interface is a straight-through joint, the optical fiber F-P type high-temperature pressure sensor to be detected is inserted into the straight-through joint and is hermetically connected with a port of the connecting steel pipe extending out of the outlet end of the heating hearth through the straight-through joint, and the sensitive point of the connected optical fiber F-P type high-temperature pressure sensor to be detected is arranged in a heating area of the high-temperature furnace.
The utility model has the following excellent technical scheme: the first pressure gauge is a digital pressure gauge; the first pressure gauge is arranged at a position close to the high-temperature furnace through a three-way interface and used for measuring and displaying reference air pressure in the high-temperature furnace, and a pressure release valve is arranged on a connecting steel pipe, which is directly connected with the high-temperature furnace, of the three-way interface and used for constructing a safe pressure boundary in the connecting pipe; the straight-through ball valve is arranged between the three-way connector and the air pressure output connector of the air pressure pump.
The utility model has the following excellent technical scheme: the connecting steel pipe is connected with an air pressure output interface of the air pressure pump through a rubber hose, the connecting steel pipe between the high-temperature furnace and the air pressure pump is supported through an iron support, and a second pressure gauge is arranged on the air pressure pump.
The utility model has the following excellent technical scheme: the pneumatic pump comprises a hand pump, a secondary pressure pump, a return check valve and two pressure output interfaces, wherein the hand pump plays a prepressing role, the secondary pressure pump is a pressure regulating valve and controls the pressure, and the return check valve is a quick pressure release valve; and the two pressure output interfaces are threaded interfaces and are respectively used for being connected with the connecting steel pipe and a second pressure gauge, and the second pressure gauge is a pointer pressure gauge.
The testing device comprises a pressure signal processing module, a high-temperature heating module, a connecting device module and a pressurizing device module; the pressure signal processing module comprises a demodulator, a computer and a pressure acquisition instrument. The computer is used for calculating and displaying the result of converting the spectral change into the pressure value, and the pressure acquisition instrument is used for acquiring the pressure value on the reference pressure gauge and inputting the pressure value into the computer for displaying. The high-temperature heating module comprises a high-temperature furnace, a hearth, a heat insulation layer, a quartz tube and a furnace plug, and the highest temperature of the high-temperature furnace can reach 1000 ℃; the hearth and the heat-insulating layer are formed by pressing ceramic fiber materials, and have heat-insulating and heat-insulating effects; the quartz tube can be replaced with different specifications and sizes according to the structural design of the hearth; the furnace plug is made of heat-insulating ceramics. The connecting device module comprises a steel pipe, a pressure release valve, a three-way connector, a digital pressure gauge, a straight-through ball valve, an iron support and a rubber hose, wherein the pressure release valve is a safety guarantee device and prevents danger caused by overlarge pressure; the three-way interface is used for connecting a digital pressure gauge; the digital pressure gauge is a standard reference pressure transmitter and is used for measuring and displaying the air pressure in the high-temperature furnace; the straight-through ball valve is used for dividing the air pressure in the whole pipeline into two parts, one part is the air pressure in the high-temperature furnace, and the other part is the air pressure of the air pressure pump; the iron support is used for fixing a pipeline; the rubber hose is used for adjusting the connection between the whole pipeline and the rear-end pneumatic pump. The pressurizing device module comprises a pneumatic pump, a pointer pressure gauge and a pneumatic output interface, wherein the pneumatic/pneumatic pump consists of a hand pump, a secondary pressurizing pump, a return check valve and a pressure output interface, the hand pump plays a prepressing role, the secondary pressurizing pump is a pressure regulating valve, the return check valve is a quick pressure relief valve, the pressure of the valve can quickly return to zero when the valve is unscrewed, and the valve needs to be screwed down when pressurizing; the pointer pressure gauge is used for measuring the pressure of the pneumatic pump part and is a low-precision pressure gauge; the pneumatic output interface consists of two M20 x 1.5 internal threads which are respectively connected with a rubber hose and a pointer pressure gauge.
The utility model has convenient integral construction and simple operation, and effectively solves the difficult point of pressure sensor calibration under high temperature condition.
Drawings
FIG. 1 is a schematic diagram of the structure of the testing device of the present invention;
FIG. 2 is an enlarged schematic view of the connection portion of the sensor of the present invention and the high temperature furnace;
FIG. 3 is a schematic view of the high temperature furnace configuration of the present invention;
FIG. 4 is a schematic diagram of the connection interface structure of the present invention;
FIG. 5 is a pressure sensitivity coefficient versus temperature graph for an example embodiment.
In the figure: 1-pressure signal processing module, 100-industrial computer, 101-optical fiber demodulation module, 102-pressure acquisition module, 2-optical fiber temperature sensor, 3-optical fiber F-P type high temperature pressure sensor that awaits measuring, 4-connecting steel pipe, 5-high temperature furnace, 500-heating furnace, 501-heat preservation, 502-stove stopper, 503-quartz capsule, 6-tee bend interface, 7-first manometer, 8-iron stand platform, 9-direct ball valve, 10-rubber hose, 11-pneumatic pump, 12-pointer manometer, 13-pneumatic output interface, 14-connection interface, 15-relief valve.
Detailed Description
The utility model is further illustrated by the following figures and examples. Fig. 1 to 5 are drawings of embodiments, which are drawn in a simplified manner and are only used for the purpose of clearly and concisely illustrating the embodiments of the present invention. The following claims presented in the drawings are specific to embodiments of the utility model and are not intended to limit the scope of the claimed invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
The testing device for the optical fiber F-P type high-temperature pressure sensor comprises a signal processing device 1, a high-temperature furnace 5 and an air pressure pump 11, wherein the high-temperature furnace 5 is connected with the air pressure pump 11 through a connecting steel pipe 4, the other end of the high-temperature furnace is hermetically communicated with an air pressure output interface 13 of the air pressure pump 11 through a rubber hose 10, a pressure release valve 15, a three-way interface 6 and a through ball valve 9 are sequentially arranged on the connecting steel pipe 4 from the end of the high-temperature furnace 5 to the end of the air pressure pump 11, the three-way interface 6 is connected with a first pressure gauge 7, a second pressure gauge 12 is arranged on the air pressure pump 11, the first pressure gauge 7 is a digital pressure gauge, and the second pressure gauge 12 is a pointer pressure gauge 7; the first pressure gauge 7 is used for measuring and displaying reference air pressure in the high-temperature furnace 5, the pressure release valve 15 is used for automatically releasing pressure when the through ball valve is closed and air pressure in the high-temperature furnace is increased due to misoperation, and the connecting steel pipe 4 between the high-temperature furnace 5 and the air pressure pump 11 is supported by the iron support 8. When the utility model is used for measurement, an independent optical fiber F-P type high-temperature pressure sensor or an optical fiber temperature sensor and an optical fiber F-P type high-temperature pressure sensor which are bundled together are horizontally arranged in a high-temperature furnace 5, a sensitive point is arranged in a heating zone of the high-temperature furnace 5, the tail end of the sensor is connected with a connecting steel pipe 4 through a straight-through interface and is screwed and sealed, then a sensor jumper head is connected into a demodulator 101, and the spectrum is displayed on a computer 102. Connecting the other end of the connecting steel pipe 4 with a three-way connector 6, wherein the three-way connector 6 is connected with a digital pressure gauge, and the other connector is connected with a straight-through ball valve; the tee joint 6 and the straight-through ball valve 9 are fixedly supported by an iron stand 8; and finally, the three-way ball valve 9 is connected with a pneumatic pump 11 through a rubber hose 10 to complete the construction of the testing device. The optical fiber temperature sensor 2 is used for measuring the temperature in the high temperature furnace 5, and is bundled together with the optical fiber F-P type high temperature pressure sensor to be horizontally placed in a heating hearth 500 of the high temperature furnace 5 when the optical fiber F-P type high temperature pressure sensor is subjected to temperature calibration and high temperature and high pressure simultaneous calibration.
In the test device of the optical fiber F-P type high-temperature pressure sensor in the embodiment, as shown in FIG. 3, the high-temperature furnace 5 is used for providing a heat source, and the highest temperature thereof reaches 1000 ℃; a heating hearth 500 which is horizontally arranged is arranged in the high-temperature furnace 5, a heat-insulating layer 501 made of ceramic materials is arranged on the inner wall of the heating hearth 500, furnace plugs 502 with through holes are respectively arranged at the inlet end and the outlet end of the heating hearth 500, quartz tubes 503 are arranged at the through holes, and the inner diameters of the quartz tubes 503 are matched with the outer diameters of the connecting steel tubes 4; the connecting steel pipe 4 horizontally extends into the heating hearth 500 from the inlet end of one side of the high-temperature furnace 5, and the end part of the connecting steel pipe passes through the heating hearth 500 and extends out of the outlet end of the heating hearth; the optical fiber F-P type high-temperature pressure sensor 3 to be detected extends into the connecting steel pipe 4 from the outlet end of the heating hearth 500 and is hermetically connected with the port of the connecting steel pipe 4 through the straight-through type connecting interface 14, and the sensitive point of the connected optical fiber F-P type high-temperature pressure sensor 3 to be detected is arranged in the heating area of the high-temperature furnace 5. The tail fiber end of the optical fiber F-P type high-temperature pressure sensor 3 to be detected extends out of the high-temperature furnace 5 and is connected with the signal input end of the signal processing device 1.
In the test device of the fiber F-P type high temperature pressure sensor in the embodiment, as shown in fig. 1, the signal processing device 1 includes a fiber demodulation module 101, an industrial personal computer 100 and a pressure acquisition module 102; the tail fiber of the optical fiber F-P type high-temperature pressure sensor 3 to be detected is connected with the optical signal input end of the optical fiber demodulation module 101 through an optical connector; the optical fiber demodulation module 101 is used for acquiring a spectrum change signal caused by the change of the cavity length of the sensor F-P caused by pressure and outputting the spectrum change signal to the industrial personal computer 100, and the industrial personal computer 100 performs upper computer software processing and displays an optical fiber pressure result; the pressure acquisition module 102 is used for reading a voltage pressure signal on the first pressure gauge 7 and inputting the voltage pressure signal to the industrial personal computer 100, and the industrial personal computer 100 performs signal processing and reference pressure value display.
The pneumatic pump 11 of the testing device of the optical fiber F-P type high-temperature pressure sensor in the embodiment comprises a hand pump, a secondary pressure pump, a return check valve and two pressure output interfaces, wherein the hand pump plays a role in prepressing, the secondary pressure pump is a pressure regulating valve and controls the pressure, the return check valve is a quick pressure relief valve, the pressure can quickly return to zero when the valve is unscrewed, and the valve is required to be screwed down during pressurization and is used for constructing a safe pressure boundary in a connecting pipe; the two pressure output interfaces are threaded interfaces and are respectively used for being connected with the rubber hose 10 and the second pressure gauge 12, and the second pressure gauge 12 is used for measuring the pressure of the pneumatic pump part.
The optical fiber temperature sensor 2 in the embodiment adopts an optical fiber grating type temperature sensor, the optical fiber F-P type high-temperature pressure sensor 3 to be measured is manufactured by adopting an F-P principle, and the connecting steel pipe 4 is made of stainless steel 316 and is a metal pipe with the outer diameter of 8 mm; the high-temperature furnace 5 adopts a tubular heating furnace, and the highest temperature is 1000 ℃; the hearth and the protective layer 501 are formed by pressing ceramic fiber materials, and have the inner diameter of 150mm, the outer diameter of 200mm and the length of 400 mm; the furnace plug 502 is made of heat-insulating ceramic; the inner diameter is 20mm, the outer diameter is 50mm, and the length is 80 mm; the quartz tube 503 is made of quartz material, and has an inner diameter of 10mm, an outer diameter of 18mm, and a length of 40 mm; the first pressure gauge 7 is a digital pressure gauge which is a standard reference pressure transmitter, the measuring range is 0-25 MPa, and the precision grade is 0.1; the straight-through ball valve 9 is a Q91SA imitation American straight-through panel type ball valve; the rubber hose 10 is 5035FT monotube; the pneumatic pump 11 is a ZC-YBS-series, ZC-400 pneumatic pump, the range is 0-6 MPa, the precision grade is 0.1, and the medium is air; the second pressure gauge 12 is a low-precision pointer pressure gauge with the type of Y-100 radial pressure, the pneumatic output interface 13 is composed of two M20 × 1.5 internal threads, and the connection interface 14 is a phi 3-phi 8 ferrule type straight-through interface.
The utility model relates to a method for calibrating the coefficient of an optical fiber F-P type high-temperature pressure sensor, which comprises the following steps:
the packaged optical fiber F-P type high-temperature pressure sensor 3 to be tested is subjected to pressure calibration by using a pneumatic pump 11 at a constant temperature of 50 ℃, and the calibration process is as follows:
1) placing the equipment in a horizontal position, and removing the plug of the pressure output interface 13;
2) connecting a pointer pressure gauge to one pressure output interface of the pneumatic pump 11, and connecting a rubber hose 10 to the other pressure output interface 13;
3) rotating a pressure regulating valve of the pneumatic pump 11 until the pressure is reduced to the lowest, detecting the zero point of the second pressure gauge 7, and recording data;
4) then closing the return check valve of the pneumatic pump 11, repeatedly lifting and pressing the hand pump of the pneumatic pump 11 to increase the pressure to about 1.2MPa, and stopping pressurizing;
5) then the pressure regulating valve of the pneumatic pump 11 is screwed to reach 0.5 MPa; closing the through ball valve 9 until the second pressure gauge 7 displays stable pressure, and recording data;
6) continuing pressurizing until the data of the first pressure gauge 12 is slightly larger than the data of the second pressure gauge 7, opening the straight-through ball valve 9, and continuing pressurizing to reach 1 MPa;
7) repeating the steps (5) and (6) for increasing the pressure by 0.5MPa every time to enable the pressure to reach 5MPa, and preparing for reducing the pressure after stable calibration;
8) the pressure value is reduced to 4.5MPa by loosening a pressure regulating valve (or a return check valve of the pneumatic pump 11) of the pneumatic pump 11, the through ball valve 9 is closed, and data can be recorded after the pressure value of the second pressure gauge 7 is stabilized;
9) repeating the operation step (8), and reducing the pressure by 0.5MPa each time until the pressure value is reduced to zero; finally, the check valve of the pneumatic pump 11 is unscrewed, the pressure is completely released, and the data is recorded and the checked meter is detached.
(II) pressure calibration data processing: and fitting the calibrated data into a sensitivity curve by using matlab, wherein the abscissa of the curve is the pressure P, and the ordinate is the wavelength variation delta lambda. And obtaining a relational expression of delta lambda and P, wherein the delta lambda and the P are in a linear relation through calculation, and the proportionality coefficient K is the pressure sensitivity.
(III) temperature calibration: the optical fiber temperature sensor 2 and the optical fiber F-P type high-temperature pressure sensor 3 to be measured are placed into a high-temperature furnace 5 together, and are calibrated under the normal pressure condition, and the specific process is as follows:
1) binding and fixing the pressure sensing point of the optical fiber F-P type high-temperature pressure sensor 3 to be detected and the temperature sensing point of the optical fiber temperature sensor 2 together by using a metal wire, placing the optical fiber F-P type high-temperature pressure sensor and the temperature sensing point in a heating zone of a high-temperature furnace 5, and fixing the two ends of the optical fiber F-P type high-temperature pressure sensor and the temperature sensing point by using an iron support 8;
2) setting a program of a high-temperature furnace 5, raising the temperature to 50 ℃, preserving the temperature for one hour, and recording the central wavelength value of the grating after the spectrum is stable; continuously heating to 100 ℃, preserving the heat for one hour, and recording the central wavelength value of the grating after the central wavelength value is stabilized; the above steps are repeated until the temperature rises to 350 ℃ to complete the calibration.
And (IV) processing temperature calibration data: and fitting the calibrated data into a sensitivity curve by using matlab, wherein the abscissa of the curve is temperature T, and the ordinate is wavelength variation delta lambda. And obtaining a relational expression of delta lambda and T, wherein the delta lambda and the T are calculated to be in a linear relation, and the proportionality coefficient K is the temperature sensitivity.
(V) calibrating at the same time at high temperature and high pressure: putting the optical fiber F-P type high-temperature pressure sensor 3 to be tested into a high-temperature furnace 5, and connecting a pneumatic pump 11, wherein the specific process is as follows:
1) checking the tightness of the equipment, and checking whether each interface leaks air;
2) firstly, introducing the pressure sensitivity formula and the temperature sensitivity formula obtained in the step (II) and the step (IV) into labview software;
3) and (3) heating the high-temperature furnace 5 to 300 ℃, measuring that the computer display pressure value is zero after the temperature is stable, pressurizing by using a pneumatic pump 11, performing the pressurizing step in the same step (II), and calibrating after the gas temperature is stable.
And (sixthly), repeating the step (five), and performing pressure test at the temperature of 350 ℃.
And (seventhly) obtaining a pressure sensitivity curve under the high-temperature condition by utilizing the steps (five) and (six).
The (eighth) test shows that the pressure sensitivity coefficient is related to the temperature as shown in FIG. 5.
And (ninthly), by utilizing the relation between the pressure sensitivity coefficient and the temperature, the wavelength variation of the F-P spectrum caused by the temperature in the test process can be obtained, so that the wavelength variation of the F-P spectrum caused by the pressure is obtained, and then the pressure value is measured in a high-temperature environment.
In summary, the present invention is described as an embodiment, but the present invention is not limited to the above embodiment, and any similar or identical means may be used to achieve the technical effects of the present invention, and all such means should fall within the protection scope of the present invention.
Claims (7)
1. The utility model provides a testing arrangement of optic fibre F-P type high temperature pressure sensor which characterized in that: the testing device comprises a signal processing device (1), a high-temperature furnace (5) and a pneumatic pump (11), wherein the high-temperature furnace (5) is connected with the pneumatic pump (11) through a connecting steel pipe (4), one end of the connecting steel pipe (4) extends into a heating hearth (500) of the high-temperature furnace (5) from one side of the high-temperature furnace (5), the other end of the connecting steel pipe is hermetically communicated with a pneumatic output interface (13) of the pneumatic pump (11), and a first pressure gauge (7) and a straight ball valve (9) are arranged on the connecting steel pipe (4); the detection end of the optical fiber F-P type high-temperature pressure sensor (3) to be detected extends into a connecting steel pipe (4) arranged in a high-temperature furnace heating hearth (500) from the other side of the high-temperature furnace (5) and is in sealed connection with the port of the connecting steel pipe (4) through a connecting interface (14), the sensitive point of the optical fiber F-P type high-temperature pressure sensor (3) to be detected is arranged in the heating area of the high-temperature furnace heating hearth (500), and the tail fiber end extends out of the high-temperature furnace (5) and is connected with the optical signal input end of the signal processing device (1); and the first pressure gauge (7) connected with the steel pipe (4) is connected with an electric signal of the signal processing device (1).
2. The testing device of the optical fiber F-P type high-temperature pressure sensor according to claim 1, characterized in that: the signal processing device (1) comprises an optical fiber demodulation module (101), an industrial personal computer (100) and a pressure acquisition module (102); the tail fiber of the optical fiber F-P type high-temperature pressure sensor (3) to be detected is connected with the optical signal input end of the optical fiber demodulation module (101) through an optical connector; the optical fiber demodulation module (101) is used for acquiring a spectrum change signal caused by the change of the cavity length of the sensor F-P caused by pressure and outputting the spectrum change signal to the industrial personal computer (100), and the industrial personal computer (100) performs upper computer software processing and displays an optical fiber pressure result; the pressure acquisition module (102) is used for reading a voltage pressure signal on the first pressure gauge (7) and inputting the voltage pressure signal to the industrial personal computer (100), and the industrial personal computer (100) performs signal processing and reference pressure value display.
3. The test device of the optical fiber F-P type high temperature pressure sensor according to claim 1 or 2, characterized in that: the testing device also comprises an optical fiber temperature sensor (2), wherein the optical fiber temperature sensor (2) is used for measuring the temperature in the high-temperature furnace (5); when the optical fiber temperature sensor (2) is used for calibrating the temperature and simultaneously calibrating high temperature and high pressure of the optical fiber F-P type high-temperature pressure sensor (3) to be measured, the optical fiber temperature sensor and the optical fiber F-P type high-temperature pressure sensor (3) to be measured are bundled together and horizontally placed in a heating hearth (500) of a high-temperature furnace (5), and sensitive points of the optical fiber temperature sensor (2) and the optical fiber F-P type high-temperature pressure sensor (3) to be measured are both placed in a heating zone of the high-temperature furnace (5); the optical fiber temperature sensor (2) and the optical fiber F-P type high-temperature pressure sensor (3) to be detected are screwed up and hermetically connected with the connecting steel pipe (4) through the through interface, and the tail fibers of the two sensors are connected with the optical signal input end of the signal processing device (1) through the optical connector.
4. The test device of the optical fiber F-P type high temperature pressure sensor according to claim 1 or 2, characterized in that: the high-temperature furnace (5) is used for providing a heat source, and the highest temperature of the high-temperature furnace reaches 1000 ℃; a horizontally arranged heating hearth (500) is arranged in the high-temperature furnace (5), an insulating layer (501) is arranged on the inner wall of the heating hearth (500), furnace plugs (502) with through holes are respectively arranged at the inlet end and the outlet end of the heating hearth (500), quartz tubes (503) are arranged at the through holes, and the inner diameters of the quartz tubes (503) are matched with the outer diameters of the connecting steel tubes (4); the connecting steel pipe (4) extends into the heating hearth from the inlet end of the heating hearth (500), and the end part of the connecting steel pipe penetrates through the heating hearth (500) and extends out of the outlet end of the heating hearth; the connecting interface (14) is a straight-through joint, the optical fiber F-P type high-temperature pressure sensor (3) to be detected is inserted into the straight-through joint and is hermetically connected with a port of the connecting steel pipe (4) extending out of the outlet end of the heating hearth through the connecting interface (14), and the sensitive point of the connected optical fiber F-P type high-temperature pressure sensor (3) to be detected is arranged in the heating area of the high-temperature furnace (5).
5. The test device of the optical fiber F-P type high temperature pressure sensor according to claim 1 or 2, characterized in that: the first pressure gauge (7) is a digital pressure gauge, the first pressure gauge (7) is arranged at a position close to the high-temperature furnace (5) through a three-way connector (6) and used for measuring and displaying reference air pressure in the high-temperature furnace (5), and a pressure release valve (15) is arranged on a connecting steel pipe (4) between the three-way connector (6) and the high-temperature furnace (5); the straight-through ball valve (9) is arranged between the three-way connector (6) and an air pressure output connector (13) of the air pressure pump.
6. The test device of the optical fiber F-P type high temperature pressure sensor according to claim 1 or 2, characterized in that: the connecting steel pipe (4) is connected with an air pressure output interface (13) of the air pressure pump (11) through a rubber hose (10), and the connecting steel pipe (4) positioned between the high-temperature furnace (5) and the air pressure pump (11) is supported through an iron support (8); a second pressure gauge (12) is arranged on the pneumatic pump (11).
7. The test device of the optical fiber F-P type high temperature pressure sensor according to claim 6, wherein: the pneumatic pump (11) comprises a hand pump, a secondary pressure pump, a return check valve and two pressure output interfaces, wherein the hand pump plays a role in prepressing, the secondary pressure pump is a pressure regulating valve and controls the pressure, and the return check valve is a quick pressure release valve; the two pressure output interfaces are threaded interfaces and are respectively used for being connected with the connecting steel pipe (4) and a second pressure gauge (12), and the second pressure gauge (12) is a pointer pressure gauge.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114878038A (en) * | 2022-05-17 | 2022-08-09 | 武汉雷施尔光电信息工程有限公司 | Double-fiber grating diaphragm type pressure sensor and low-pressure calibration system and method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114878038A (en) * | 2022-05-17 | 2022-08-09 | 武汉雷施尔光电信息工程有限公司 | Double-fiber grating diaphragm type pressure sensor and low-pressure calibration system and method thereof |
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