CN112304468A - Optical fiber high-temperature strain gauge - Google Patents
Optical fiber high-temperature strain gauge Download PDFInfo
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- CN112304468A CN112304468A CN202011069595.8A CN202011069595A CN112304468A CN 112304468 A CN112304468 A CN 112304468A CN 202011069595 A CN202011069595 A CN 202011069595A CN 112304468 A CN112304468 A CN 112304468A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 135
- 239000011521 glass Substances 0.000 claims abstract description 36
- 239000000835 fiber Substances 0.000 claims abstract description 30
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 14
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 14
- 230000001681 protective effect Effects 0.000 claims abstract description 12
- 239000000758 substrate Substances 0.000 claims abstract description 12
- 230000008929 regeneration Effects 0.000 claims description 56
- 238000011069 regeneration method Methods 0.000 claims description 56
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 239000013078 crystal Substances 0.000 claims description 8
- 229910052594 sapphire Inorganic materials 0.000 claims description 8
- 239000010980 sapphire Substances 0.000 claims description 8
- 239000005388 borosilicate glass Substances 0.000 claims description 5
- 239000010453 quartz Substances 0.000 claims description 5
- 239000004038 photonic crystal Substances 0.000 claims description 3
- 238000005538 encapsulation Methods 0.000 abstract description 3
- 230000009471 action Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 239000011888 foil Substances 0.000 abstract description 2
- 238000004026 adhesive bonding Methods 0.000 abstract 1
- 239000004033 plastic Substances 0.000 abstract 1
- 239000003292 glue Substances 0.000 description 15
- 230000008878 coupling Effects 0.000 description 10
- 238000010168 coupling process Methods 0.000 description 10
- 238000005859 coupling reaction Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 7
- 230000004044 response Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000006698 induction Effects 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
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- 238000007789 sealing Methods 0.000 description 1
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- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
Abstract
A clamping groove is processed on a substrate, an optical fiber temperature strain sensor, an optical fiber temperature sensor and a thermoplastic tube which are packaged in a capillary glass tube are arranged in the clamping groove, one end of the thermoplastic tube is connected with the end part of the capillary glass tube, the other end of the thermoplastic tube is connected with a tail fiber protective sleeve, and an optical fiber tail fiber sequentially penetrates through the thermoplastic tube and the tail fiber protective sleeve to be connected with a jumper wire. Prevent that optic fibre temperature strain sensor, optic fibre temperature sensor from droing in the use, introduce certain prestressing force when gluing optic fibre temperature strain sensor with high temperature to fixed, capillary glass pipe is fixed in the substrate piece draw-in groove, is moulded the encapsulation with the thermal plastic pipe thermoplasticity of tail optical fiber protective sheath, plays encapsulation protection, isolated strain influence to optic fibre temperature sensor for whole closed construction that forms has played the guard action to the tail optical fiber, has improved the intensity of foil gage. The invention has the advantages of simple structure, convenient use, stable operation and the like, and can simultaneously measure the temperature and the strain under the environment of room temperature to 1000 ℃.
Description
Technical Field
The invention belongs to the technical field of optical fiber sensors, and particularly relates to an optical fiber high-temperature strain gauge.
Background
The problem of simultaneously and accurately measuring the temperature and the strain is always a key technical problem in the field of structural health monitoring, in particular to stress detection of a skin part in a high-speed aircraft. The national aerospace agency of the United states developed application studies from the 20 th century to the 80 th century that reflected changes in the shape of aircraft wings using strain information. The current resistance strain gauge testing technology is the most important and practical testing method for knowing the actual working stress of a component, and the testing method has a plurality of problems to be solved along with the improvement of working temperature, and has technical difficulties except for the material of a substrate grid wire, the complex manufacturing process, the sticking protection of a strain gauge, the modification of a lead, the strain measurement, the data processing and other links.
With the rapid development of modern optical technology, photoelectron detection technology, digital image processing technology and image acquisition equipment, optical measurement mechanical technology and optical fiber sensing technology for realizing strain measurement and monitoring by using an optical method have become important branches in mechanical property testing, measurement and monitoring. Especially, the optical fiber sensor, as the sensor, is elegant, has abundant structural types and various sensing mechanisms, wherein the optical fiber sensor has excellent characteristics for sensing temperature and strain parameters, and simultaneously can realize multipoint and multi-parameter measurement capabilities by virtue of high response sensitivity, small self volume, good electromagnetic interference resistance capability, easily configured appearance and characteristics of high temperature resistance and corrosion resistance.
The optical fiber temperature strain sensor mainly has the advantages of small strain detection range and temperature detection range, wherein the strain detection range is 0-200 mu epsilon, the temperature detection range is room temperature-80 ℃, and the optical fiber temperature strain sensor cannot be used in the environment with large strain detection range and large temperature detection range.
Disclosure of Invention
The invention aims to overcome the defects that the strain sensor is cross-sensitive to temperature and strain and difficult to distinguish and measure, and provides the optical fiber high-temperature strain gauge with simple structure, small volume and high sensitivity.
The technical scheme for solving the technical problems is as follows: a clamping groove a is processed on the substrate sheet, an optical fiber temperature strain sensor, an optical fiber temperature sensor and a thermoplastic tube which are mutually connected are arranged in the clamping groove a, one end of the thermoplastic tube is connected with the end part of the capillary glass tube, the other end of the thermoplastic tube is connected with a tail fiber protective sleeve, and an optical fiber tail fiber sequentially penetrates through the thermoplastic tube and the tail fiber protective sleeve to be connected with a jumper wire.
The optical fiber temperature strain sensor comprises an optical fiber and a temperature strain thermal regeneration grating engraved on the optical fiber, and the optical fiber temperature sensor comprises the optical fiber and the temperature thermal regeneration grating engraved on the optical fiber.
The grating region length of the temperature strain thermal regeneration grating is 10mm, the central wavelength is 1515-1575 nm, the grating region length of the temperature thermal regeneration grating is 10mm, the central wavelength is 1510-1570 nm, the temperature thermal regeneration grating is positioned in a capillary glass tube, and the distance between the temperature thermal regeneration grating and the temperature strain thermal regeneration grating is 20-30 mm.
The distance between the temperature thermal regeneration grating and the end part of the capillary glass tube on one side of the temperature strain thermal regeneration grating is 10-15 mm.
The optical fiber temperature strain sensor of the invention can also be a Fabry-Perot interferometer sensor.
The optical fiber temperature strain sensor of the present invention may also be a mach-zehnder interferometer sensor.
The optical fiber of the invention is any one of quartz optical fiber, sapphire derived optical fiber, YAG crystal optical fiber and photonic crystal optical fiber.
The capillary glass tube of the invention is a quartz glass capillary tube, a borosilicate glass capillary tube and a sapphire crystal capillary tube.
The invention adopts the same or similar manufacturing material of the substrate sheet and the measured object, reduces the loss in stress transmission during measurement, is convenient to carry and is simple and convenient to operate. Processing the draw-in groove on the basement piece, fix optic fibre temperature strain sensor, capillary glass pipe, optic fibre temperature sensor in the draw-in groove, prevent optic fibre temperature strain sensor in the use, optic fibre temperature sensor drops, use high temperature glue to introduce certain prestressing force when fixed to optic fibre temperature strain sensor both ends, the capillary glass pipe left end that is close to optic fibre temperature strain sensor is fixed in the draw-in groove of basement piece with high temperature glue, capillary glass pipe right-hand member and tail optical fiber protective sheath are moulded by the thermoplasticity of thermoplasticity pipe and are encapsulated, play encapsulation protection, isolated strain influence to optic fibre temperature sensor, make whole formation a enclosed construction, play the guard action to the tail optical fiber, the intensity of foil gage has been improved.
When the optical fiber temperature sensor is used, the optical fiber temperature sensor is contacted with an object to be detected, the temperature and the strain of the object to be detected are sensed and responded by the optical fiber temperature strain sensor, and the optical fiber temperature sensor is only subjected to temperature response. According to the calibration test performed in the earlier stage of the strain gauge, a certain demodulation parameter of the spectrum of the optical fiber temperature sensor is used for demodulating the temperature of the object at the moment to obtain the environment temperature of the optical fiber temperature strain sensor at the moment, and the drift amount of the demodulation parameter can be obtained when the optical fiber temperature strain sensor is only responded by the temperature by using the calibration test performed in the earlier stage of the strain gauge. The optical fiber temperature strain sensor simultaneously responds to the temperature and the strain of an object to be measured, the drift amount of the demodulation parameter influenced by the temperature is subtracted from the drift amount of the demodulation parameter influenced by the temperature, the drift amount of the demodulation parameter influenced by the strain is obtained through the drift amount of the demodulation parameter influenced by the temperature and the strain of the optical fiber temperature strain sensor, the strain at the moment is obtained according to a calibration test performed in the earlier stage of the strain gauge, and the temperature and the strain of various states between the room temperature and 1000 ℃ are measured simultaneously.
The invention has the advantages of simple structure, convenient use, stable operation and the like, and can simultaneously measure the temperature and the strain under the environment of room temperature to 1000 ℃.
Drawings
Fig. 1 is a schematic structural view of embodiment 1 of the present invention.
FIG. 2 is a temperature response curve of the high temperature strain gauge of the optical fiber in example 1 of the present invention at 1000 ℃.
FIG. 3 is a strain response curve of the high temperature strain gage of the optical fiber of example 1 of the present invention at 1000. mu. epsilon.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, but the present invention is not limited to these examples.
Example 1
In fig. 1, the optical fiber high temperature strain gauge of the present embodiment is formed by connecting a substrate sheet 1, an optical fiber 2, a temperature strain thermal regeneration grating 3, a capillary glass tube 4, a temperature thermal regeneration grating 5, a thermoplastic tube 6, an optical fiber pigtail 7, a pigtail protective sleeve 8, and a jumper 9.
The substrate sheet 1 of this embodiment is made of a high temperature material resistant to a temperature of more than 1000 ℃, a clamping groove a is transversely processed at the central position of the substrate sheet 1, two ends of the optical fiber temperature strain sensor are bonded in the clamping groove a by high temperature glue, the left end of the capillary glass tube 4 close to the optical fiber temperature strain sensor is bonded in the clamping groove a by high temperature glue, the optical fiber temperature sensor is packaged in the capillary glass tube 4, the high temperature glue of this embodiment is high temperature ceramic glue, the capillary glass tube 4 is a quartz glass capillary tube, a high temperature bonding layer is formed after the high temperature glue is solidified, the optical fiber temperature strain sensor and the capillary glass tube 4 are fixed in the clamping groove a, when the substrate sheet is used in a high temperature environment of 1000 ℃, the optical fiber temperature strain sensor and the optical fiber temperature sensor are not damaged or fall out of the clamping groove a, so that the strain gauge has stable performance in the high temperature environment, the temperature and strain signals can be accurately received.
The optical fiber temperature strain sensor of the present embodiment is formed by writing a temperature strain thermal regeneration grating 3 on an optical fiber 2. The optical fiber 2 is a quartz optical fiber, the length of a grid region of the temperature strain thermal regeneration grating 3 is 10mm, the central wavelength is 1545nm, and the temperature strain thermal regeneration grating 3 is used for receiving temperature and strain signals. The optical fiber temperature sensor of the embodiment is formed by writing a temperature thermal regeneration grating 5 on an optical fiber 2, the grating region length of the temperature thermal regeneration grating 5 is 10mm, the central wavelength is 1540nm, the temperature thermal regeneration grating 5 is used for receiving a temperature signal, the temperature thermal regeneration grating 5 is positioned in a capillary glass tube 4, the distance between the temperature thermal regeneration grating 5 and the end part of the capillary glass tube 4 on one side of the temperature strain thermal regeneration grating 3 is 12mm, and the distance between the temperature thermal regeneration grating 5 and the temperature strain thermal regeneration grating 3 is 25 mm.
The tip and the 7 butt fusion of optic fibre tail optical fiber of optic fibre 2, it moulds the pipe 6 to be equipped with to heat at the splice point overcoat, and it moulds the pipe 6 to heat to mould the heat and be used for protecting the splice point, and the one end of moulding the pipe 6 and the tip of capillary glass pipe 4, the other end and tail optical fiber protective sheath 8 are with the heat sealing machine thermoplasticity fixed coupling, and tail optical fiber protective sheath 8 is used for protecting tail optical fiber 7, and optic fibre tail optical fiber 7 passes in proper order and moulds the pipe 6, tail optical fiber protective sheath 8.
Example 2
The optical fiber temperature strain sensor of the present embodiment is formed by writing a temperature strain thermal regeneration grating 3 on an optical fiber 2. The optical fiber is a quartz optical fiber, the length of the gate region of the temperature strain thermal regeneration grating 3 is 10mm, and the central wavelength is 1515 nm. The optical fiber temperature sensor is formed by writing a temperature thermal regeneration grating 5 on an optical fiber 2, the length of a grating region of the temperature thermal regeneration grating 5 is 10mm, the central wavelength is 1510nm, the temperature thermal regeneration grating 5 is positioned in a capillary glass tube 4, the distance between the temperature thermal regeneration grating 5 and the end part of the capillary glass tube 4 on one side of a temperature strain thermal regeneration grating 3 is 10mm, and the distance between the temperature thermal regeneration grating 5 and the temperature strain thermal regeneration grating 3 is 20 mm.
Other components and the coupling relationship of the components are the same as those in embodiment 1.
Example 3
The optical fiber temperature strain sensor of the present embodiment is formed by writing a temperature strain thermal regeneration grating 3 on an optical fiber 2. The optical fiber is a quartz optical fiber, the length of a grid region of the temperature strain thermal regeneration grating 3 is 10mm, and the central wavelength is 1575 nm. The optical fiber temperature sensor is formed by writing a temperature thermal regeneration grating 5 on an optical fiber 2, the length of a grating region of the temperature thermal regeneration grating 5 is 10mm, the central wavelength is 1570nm, the temperature thermal regeneration grating 5 is positioned in a capillary glass tube 4, the distance between the temperature thermal regeneration grating 5 and the end part of the capillary glass tube 4 on one side of a temperature strain thermal regeneration grating 3 is 15mm, and the distance between the temperature thermal regeneration grating 5 and the temperature strain thermal regeneration grating 3 is 30 mm.
Other components and the coupling relationship of the components are the same as those in embodiment 1.
Example 4
In the above embodiments 1 to 3, the optical fiber temperature strain sensor of the present embodiment is formed by writing the temperature strain thermal regeneration grating 3 on the optical fiber 2, and the optical fiber temperature sensor is formed by writing the temperature thermal regeneration grating 5 on the optical fiber 2, and the optical fiber 2 of the present embodiment is a sapphire-derived optical fiber.
Other components and the coupling relationship of the components are the same as those of the corresponding embodiment.
Example 5
In the above embodiments 1 to 3, the optical fiber temperature strain sensor of the present embodiment is formed by writing the temperature strain thermal regeneration grating 3 on the optical fiber 2, and the optical fiber temperature sensor is formed by writing the temperature thermal regeneration grating 5 on the optical fiber 2, and the optical fiber 2 of the present embodiment is a YAG crystal optical fiber.
Other components and the coupling relationship of the components are the same as those of the corresponding embodiment.
Example 6
In the above embodiments 1 to 3, the optical fiber temperature strain sensor of the present embodiment is formed by writing the temperature strain thermal regeneration grating 3 on the optical fiber 2, and the optical fiber temperature sensor is formed by writing the temperature thermal regeneration grating 5 on the optical fiber 2, and the optical fiber 2 of the present embodiment is a photonic crystal fiber.
Other components and the coupling relationship of the components are the same as those of the corresponding embodiment.
Example 7
In the above embodiments 1 to 6, a clamping groove a is transversely processed at the central position of the substrate sheet 1, two ends of the optical fiber temperature strain sensor are bonded in the clamping groove a by high-temperature glue, the left end of the capillary glass tube 4 close to the optical fiber temperature strain sensor is bonded in the clamping groove a by the high-temperature glue, the optical fiber temperature sensor is packaged in the capillary glass tube 4, the high-temperature glue of the embodiment adopts high-temperature ceramic glue, and the capillary glass tube 4 adopts a borosilicate glass capillary.
Other components and the coupling relationship of the components are the same as those of the corresponding embodiment.
Example 8
In the above embodiments 1 to 6, a clamping groove a is transversely processed at the central position of the substrate sheet 1, two ends of the optical fiber temperature strain sensor are bonded in the clamping groove a by high-temperature glue, the left end of the capillary glass tube 4 close to the optical fiber temperature strain sensor is bonded in the clamping groove a by the high-temperature glue, the optical fiber temperature sensor is packaged in the capillary glass tube 4, the high-temperature glue of the embodiment adopts high-temperature ceramic glue, and the capillary glass tube 4 adopts a sapphire crystal capillary.
Other components and the coupling relationship of the components are the same as those of the corresponding embodiment.
Example 9
In the above embodiments 1 to 3, the optical fiber temperature strain sensor is composed of a fabry-perot interferometer sensor, and the capillary glass tube 4 may be a quartz glass capillary tube, a borosilicate glass capillary tube, or a sapphire crystal capillary tube. Other components and the coupling relationship of the components are the same as those of the corresponding embodiment.
Example 10
In the above embodiments 1 to 3, the optical fiber temperature strain sensor is constituted by the mach-zehnder interferometer sensor, and the capillary glass tube 4 may be a quartz glass capillary tube, a borosilicate glass capillary tube, or a sapphire crystal capillary tube. Other components and the coupling relationship of the components are the same as those of the corresponding embodiment.
In order to verify the beneficial effects of the present invention, the inventor carried out experiments using the optical fiber high temperature strain gauge prepared in example 1 of the present invention, and the experimental conditions were as follows:
in the temperature heating process of the high-temperature induction furnace, the temperature is increased from normal temperature to 1000 ℃ in a unit of 100 ℃, each temperature point is kept for 10 minutes to ensure that the temperature in the high-temperature induction furnace is uniformly distributed, and after the spectrum is stable, data is recorded every 20 ℃, so that the temperature response spectral line of the optical fiber temperature sensor can be obtained; each temperature point was subjected to a strain test in the high temperature induction furnace, and each temperature point was held for 10 minutes before the strain was applied to ensure uniform temperature distribution in the high temperature induction furnace. And (3) adjusting the strain initial state of the test sample by using a tensile machine, controlling the tensile machine to apply strain to the high-temperature strain gauge by the computer at each constant temperature, increasing the strain from 0 mu epsilon to 1000 mu epsilon, and then decreasing the strain from 1000 mu epsilon to 0 mu epsilon to obtain a strain response spectral line of the optical fiber temperature strain sensor at each temperature point.
As shown in fig. 2, the linear fitting formula obtained from the linear fitting of the optical fiber temperature strain sensor is:
y1＝1538.01754+0.01636x
the linearity is 0.98953, and the temperature sensitivity of the optical fiber temperature strain sensor is 16.36 pm/DEG C. The linear fitting formula obtained from the linear fitting of the optical fiber temperature sensor is as follows:
Y2＝1548.55836+0.01284x
the linearity was 0.98793, and the temperature sensitivity of the fiber optic temperature sensor was 12.84 pm/deg.C. As can be seen from fig. 2, as the temperature increases, the wavelength shifts to a long wavelength direction; the drift effect of the spectrum with temperature is mainly caused by the thermal expansion effect and the thermo-optic effect of the fiber grating.
As shown in fig. 3, the linear fitting formula obtained from the linear fitting of the optical fiber temperature strain sensor is:
y1＝1544.34058+8.338e-4x
the linearity is 0.95123 and the strain sensitivity of the fiber optic temperature strain sensor is 0.8339 pm/. mu.epsilon. The linear fitting formula obtained from the linear fitting of the optical fiber temperature sensor is as follows:
Y2＝1557.23858+8.809e-6x
the linearity is 0.40826, the strain sensitivity of the first thermal regeneration fiber grating 5 is 0.0088 pm/mu epsilon, and the fiber temperature sensor has little response to strain and only responds to temperature under the packaging of the capillary glass tube 7. As can be seen from fig. 3, as the strain increases, the wavelength shifts to the long wavelength direction. The drift effect of the spectrum with strain is mainly caused by the elasto-optic effect of the fiber grating.
Experimental results show that the invention can simultaneously realize accurate measurement of temperature and strain in a high-temperature environment from room temperature to 1000 ℃.
Claims (8)
1. An optical fiber high-temperature strain gauge is characterized in that: a clamping groove (a) is processed on a substrate sheet (1), an optical fiber temperature strain sensor, an optical fiber temperature sensor and a thermoplastic tube (6) which are connected with each other are arranged in the clamping groove (a), the optical fiber temperature sensor and the thermoplastic tube are packaged in a capillary glass tube (4), one end of the thermoplastic tube (6) is connected with the end part of the capillary glass tube (4), the other end of the thermoplastic tube is connected with a tail fiber protective sleeve (7), and an optical fiber tail fiber (8) sequentially penetrates through the thermoplastic tube (6) and the tail fiber protective sleeve (8) to be connected with a jumper wire (9).
2. The optical fiber high temperature strain gauge according to claim 1, wherein: the optical fiber temperature strain sensor is composed of an optical fiber (2) and a temperature strain heat regeneration grating (3) engraved on the optical fiber (2), and the optical fiber temperature sensor is composed of the optical fiber (2) and a temperature heat regeneration grating (5) engraved on the optical fiber (2).
3. The optical fiber high temperature strain gauge according to claim 2, wherein: the grating region length of the temperature-to-heat thermal regeneration grating (3) is 10mm, the central wavelength is 1515-1575 nm, the grating region length of the temperature-to-heat thermal regeneration grating (5) is 10mm, the central wavelength is 1510-1570 nm, the temperature-to-heat thermal regeneration grating (5) is located in the capillary glass tube (4), and the distance between the temperature-to-heat thermal regeneration grating (5) and the temperature-to-heat thermal regeneration grating (3) is 20-30 mm.
4. The optical fiber high temperature strain gauge according to claim 3, wherein: the distance between the temperature thermal regeneration grating (5) and the end part of the capillary glass tube (4) on one side of the temperature strain thermal regeneration grating (3) is 10-15 mm.
5. The optical fiber high temperature strain gauge according to claim 1, wherein: the optical fiber temperature strain sensor is a Fabry-Perot interferometer sensor.
6. The optical fiber high temperature strain gauge according to claim 2, wherein: the optical fiber temperature strain sensor is a Mach-Zehnder interferometer sensor.
7. The optical fiber high temperature strain gauge according to claim 2, wherein: the optical fiber (2) is any one of a quartz optical fiber, a sapphire derived optical fiber, a YAG crystal optical fiber and a photonic crystal optical fiber.
8. The optical fiber high temperature strain gauge according to claim 1, 3 or 4, wherein: the capillary glass tube (4) is a quartz glass capillary tube, a borosilicate glass capillary tube and a sapphire crystal capillary tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011069595.8A CN112304468A (en) | 2020-09-30 | 2020-09-30 | Optical fiber high-temperature strain gauge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011069595.8A CN112304468A (en) | 2020-09-30 | 2020-09-30 | Optical fiber high-temperature strain gauge |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114322814A (en) * | 2021-12-28 | 2022-04-12 | 中国人民解放军国防科技大学 | Anti-scouring high-temperature strain sensor for metal casting of sapphire fiber grating |
| CN114777836A (en) * | 2022-03-10 | 2022-07-22 | 吉林大学 | Optical fiber high-temperature stress sensor based on yttrium aluminum garnet crystal derived optical fiber and preparation method thereof |
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| JP4897445B2 (en) * | 2006-11-28 | 2012-03-14 | 株式会社共和電業 | Optical fiber strain gauge |
| CN105333833A (en) * | 2015-10-27 | 2016-02-17 | 北京航空航天大学 | Temperature-independent fiber bragg grating strain sensor |
| CN108195299A (en) * | 2017-12-25 | 2018-06-22 | 北京信息科技大学 | For the FP of high temperature strain measurement and regeneration FBG compound sensors |
| CN110044288A (en) * | 2019-04-03 | 2019-07-23 | 西北工业大学 | High temperature resistant strain transducer based on FBG |
| CN110579287A (en) * | 2019-09-16 | 2019-12-17 | 西北大学 | Optical fiber sensor packaged based on single capillary glass tube and testing method |
| CN110579288A (en) * | 2019-09-16 | 2019-12-17 | 西北大学 | Optical fiber sensor based on double capillary glass tube packaging |
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2020
- 2020-09-30 CN CN202011069595.8A patent/CN112304468A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4897445B2 (en) * | 2006-11-28 | 2012-03-14 | 株式会社共和電業 | Optical fiber strain gauge |
| CN105333833A (en) * | 2015-10-27 | 2016-02-17 | 北京航空航天大学 | Temperature-independent fiber bragg grating strain sensor |
| CN108195299A (en) * | 2017-12-25 | 2018-06-22 | 北京信息科技大学 | For the FP of high temperature strain measurement and regeneration FBG compound sensors |
| CN110044288A (en) * | 2019-04-03 | 2019-07-23 | 西北工业大学 | High temperature resistant strain transducer based on FBG |
| CN110579287A (en) * | 2019-09-16 | 2019-12-17 | 西北大学 | Optical fiber sensor packaged based on single capillary glass tube and testing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114322814A (en) * | 2021-12-28 | 2022-04-12 | 中国人民解放军国防科技大学 | Anti-scouring high-temperature strain sensor for metal casting of sapphire fiber grating |
| CN114777836A (en) * | 2022-03-10 | 2022-07-22 | 吉林大学 | Optical fiber high-temperature stress sensor based on yttrium aluminum garnet crystal derived optical fiber and preparation method thereof |
| CN114777836B (en) * | 2022-03-10 | 2023-12-05 | 吉林大学 | Optical fiber high-temperature stress sensor based on yttrium aluminum garnet crystal derived optical fiber and preparation method thereof |
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