CN119958447A - A radiation-resistant fiber Bragg grating strain sensor and a fiber Bragg grating packaging structure - Google Patents
A radiation-resistant fiber Bragg grating strain sensor and a fiber Bragg grating packaging structure Download PDFInfo
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Abstract
The invention relates to the technical field of fiber bragg grating strain sensors, in particular to an irradiation-resistant fiber bragg grating strain sensor and a fiber bragg grating packaging structure. In order to solve the problems that the traditional fiber bragg grating pretensioning mode is relatively low in control precision, low in yield and poor in measurement range adjustment flexibility, the novel irradiation-resistant fiber bragg grating strain sensor is provided, and comprises a fiber bragg grating and a fiber bragg grating packaging structure, the fiber bragg grating packaging structure comprises a bottom plate, the left end part of the bottom plate is fixedly provided with a sliding rail, a sliding plate is arranged on the sliding rail in a left-right sliding mode, a positioning fixing piece for positioning and fixing the sliding plate after the sliding plate slides relative to the sliding rail is arranged on the sliding plate and the sliding rail in a left-right sliding mode, a fixing block is fixed on the right end part of the sliding rail and is positioned on the right side of the sliding plate, a threaded through hole is formed in the fixing block, an adjusting bolt is arranged in the threaded through hole, and a fixing plate is fixed on the right end part of the bottom plate. The sensor has a simple structure and flexible adjustment of the strain measurement range.
Description
Technical Field
The invention relates to the technical field of fiber bragg grating strain sensors, in particular to an irradiation-resistant fiber bragg grating strain sensor and a fiber bragg grating packaging structure.
Background
In severe radiation environments such as space, nuclear industry, nuclear power stations and the like, on-line monitoring of strain parameters is often required by using a sensing technology capable of running stably for a long time so as to improve the safety and reliability of equipment operation. Conventional electronic sensors are susceptible to electromagnetic fields, high temperatures, ionizing radiation, etc., and can cause malfunctions during operation. Fiber Bragg Grating (FBG) sensors have the advantages of electromagnetic interference resistance, high temperature resistance, high sensitivity, and fast response, as compared to conventional sensors, and are considered as potential candidates for use in a radiation environment.
The fiber grating is formed by realizing periodic variation of refractive index along axial direction in fiber core by specific technical means, and the diffraction grating can reflect light with specific wavelength meeting the condition lambda B = 2neff lambda, lambda B represents central wavelength of the grating, n eff is effective refractive index of fiber core, and lambda grating period. Any change in the effective refractive index of the core and the grating period will result in a corresponding change in the center wavelength of the grating. When external strain acts on the fiber grating, the fiber grating region is stretched or compressed, so that the central wavelength of the grating is changed, and the change can be accurately monitored, thereby realizing effective monitoring of the strain.
Fiber bragg grating strain sensors are widely used in a variety of industrial fields due to their accuracy and stability. The accuracy and reliability of the fiber grating sensor are greatly dependent on the design and implementation of the packaging technology, and in the packaging process of the fiber grating strain sensor, if the fiber grating is not properly prestretched, the grating region will remain in a relaxed state, and when the fiber grating strain sensor is subjected to inward extrusion force, the fiber grating itself will not be subjected to corresponding force, so that external force cannot be effectively transmitted to the fiber grating, and thus the fiber grating strain sensor cannot monitor negative strain. In an application environment requiring large-scale negative strain detection, if the pre-stretching amount of the fiber grating is insufficient, once a certain measurement range is reached, the fiber grating is not stressed any more and is converted into a relaxed state, which limits the monitoring capability of the fiber grating on larger negative strain. In order to meet the requirement of negative strain measurement, when the fiber grating strain sensor is manufactured, a proper amount of pre-stretching is needed to the fiber grating Shi Jiage in the fiber grating strain sensor, in addition, the fiber grating is weak in texture, and when the applied tensile force is too large, the fiber grating is easy to break, so that a monitoring function is lost, and therefore, when the strain measurement is performed, the control of the pre-stretching amount of the fiber grating is very important.
The traditional fiber bragg grating pre-stretching mode mainly comprises manual stretching, then the stretched fiber bragg grating is subjected to glue dispensing, heating and curing, but the control accuracy of the pre-stretching amount of the fiber bragg grating by the manual stretching is relatively low, meanwhile, the glue dispensing, heating and curing difficulty is increased by the glue dispensing, heating and curing after the stretching, the yield is low, in addition, the method cannot measure different strain ranges of a measured piece, namely, the strain ranges are different, the pre-stretching amount of the fiber bragg grating is different, the fiber bragg grating is required to be stretched again, the glue dispensing, heating and curing are carried out, the operation is complex, and the adjustment flexibility of the measurement range is poor.
Disclosure of Invention
The invention aims to solve the problems of relatively low control precision, low yield and poor adjustment flexibility of a measurement range of the traditional fiber bragg grating pre-stretching mode, and provides a novel radiation-resistant fiber bragg grating strain sensor and a fiber bragg grating packaging structure.
The invention is realized by adopting the following technical scheme:
The utility model provides a radiation-resistant fiber grating strain sensor, including fiber grating and fiber grating packaging structure, fiber grating packaging structure includes the bottom plate, the left end portion of bottom plate is fixed with the slide rail, sliding arrangement has the slide about on the slide rail, it is fixed to be used for the slide to slide the back location fixed part of slide relative slide rail to be furnished with on slide and the slide rail, slide and bottom plate parallel arrangement, right end portion fixed with the fixed block on the slide rail, the fixed block is located the right side of slide, be equipped with its axial for the screw thread through-hole of arranging of left and right directions on the fixed block, set up the adjusting bolt who is used for promoting the slide to remove left in the screw thread through-hole, be fixed with the fixed plate with bottom plate parallel arrangement on the right end portion of bottom plate.
When the device is used, the two ends of the fiber bragg grating are respectively fixed on the sliding plate and the fixed plate in a dispensing mode, the fiber bragg grating is naturally straightened through the sliding plate and the fixed plate, the sliding plate is pre-tensioned through the positioning fixing piece (the sliding plate can still slightly move relative to the sliding rail when being pushed after being pre-tensioned, then the adjusting bolt is screwed according to the strain range to be tested, the adjusting bolt pushes the sliding plate to move leftwards, finally the sliding plate is positioned and fixed through the positioning fixing piece, and the pre-tensioning of the fiber bragg grating is completed, and the strain measurement of the tested component can be realized only by fixing the bottom plate on the tested component during measurement. In addition, when the strain measurement range is adjusted, the positioning fixing piece is released, so that when the sliding plate is in a freely sliding state relative to the sliding rail, the adjusting bolt is unscrewed, the sliding plate is manually pushed to slide rightwards until the sliding plate contacts with the left end face of the fixing block, the sliding plate is pre-tightened again through the positioning fixing piece, then the adjusting bolt is screwed according to the strain range to be tested, further the pre-stretching range of the fiber bragg grating is adjusted, and the strain measurement range is adjusted.
Furthermore, the optical fiber adopted by the fiber bragg grating is a single-mode pure quartz fiber core optical fiber, and is inscribed by femtosecond laser, so that the irradiation resistance is better.
The utility model provides a fiber bragg grating packaging structure, including the bottom plate, the left end portion of bottom plate is fixed with the slide rail, has arranged the slide about on the slide rail, has set up the location mounting that is used for slide relative slide rail slip back location fixed on slide and the slide rail, slide and bottom plate parallel arrangement, the right-hand member fixed on the slide rail has the fixed block, the fixed block is located the right side of slide, be equipped with its axial for the screw thread through-hole of arranging of left and right directions on the fixed block, set up the adjusting bolt who is used for promoting the slide to remove left in the screw thread through-hole, be fixed with on the right-hand member portion of bottom plate with bottom plate parallel arrangement's fixed plate.
When the device is used, the two ends of the fiber bragg grating are respectively fixed on the sliding plate and the fixed plate in a dispensing mode, the fiber bragg grating is naturally straightened through the sliding plate and the fixed plate, the sliding plate is pre-tensioned through the positioning fixing piece (the sliding plate can still slightly move relative to the sliding rail when being pushed after being pre-tensioned, then the adjusting bolt is screwed according to the strain range to be tested, the adjusting bolt pushes the sliding plate to move leftwards, finally the sliding plate is positioned and fixed through the positioning fixing piece, and the pre-tensioning of the fiber bragg grating is completed, and the strain measurement of the tested component can be realized only by fixing the bottom plate on the tested component during measurement. In addition, when the strain measurement range is adjusted, the positioning fixing piece is released, so that when the sliding plate is in a freely sliding state relative to the sliding rail, the adjusting bolt is unscrewed, the sliding plate is manually pushed to slide rightwards until the sliding plate contacts with the left end face of the fixing block, the sliding plate is pre-tightened again through the positioning fixing piece, then the adjusting bolt is screwed according to the strain range to be tested, further the pre-stretching range of the fiber bragg grating is adjusted, and the strain measurement range is adjusted.
Further, the slide rail comprises an upper strip-shaped plate and a lower strip-shaped plate, the cross section of the upper strip-shaped plate is in an inverted L shape, the cross section of the lower strip-shaped plate is in an L shape, the upper strip-shaped plate and the lower strip-shaped plate are distributed up and down and are arranged in opposite directions, the upper strip-shaped plate and the lower strip-shaped plate are fixed on the left end plate and respectively form an upper chute and a lower chute with the left end plate, and the slide plate is matched with the upper chute and the lower chute. The sliding rail has simple structure and is easy to realize.
Further, the positioning fixing piece comprises an upper fastening bolt and a lower fastening bolt, the top surface of the upper strip-shaped plate is provided with an upper fastening threaded hole which is vertically arranged and matched with the upper fastening bolt, and the top surface of the lower strip-shaped plate is provided with a lower fastening threaded hole which is vertically arranged and matched with the lower fastening bolt. After the sliding plate slides to the designated position, the positioning and fixing of the sliding plate can be realized only by tightening the upper fastening bolt and the lower fastening bolt, and the structure of the positioning and fixing piece is concrete and standardized.
Further, the bottom plate comprises a left end plate and a right end plate, the left end plate is fixedly connected with the right end plate through an H-shaped plate, and the fiber bragg grating can timely respond when the tested member generates strain, so that the sensitivity of the fiber bragg grating is guaranteed.
Further, a plurality of fixing holes are distributed on the bottom plate, so that spot welding or bolt fixing is conveniently carried out on different parts of the tested member, further, strain measurement is conveniently carried out on different parts of the tested member, strain conditions of the tested member in different areas are comprehensively captured, and therefore more comprehensive data support is provided for analysis of the tested member.
Furthermore, the sliding plate and the fixed plate are respectively provided with a clamping groove for placing the fiber bragg grating, so that the fiber bragg grating can be positioned conveniently.
Further, the slide plate and the fixed plate are also provided with glue dispensing grooves which are convenient for dispensing the fiber bragg grating, so that the fiber bragg grating can be conveniently fixed in a glue dispensing way.
The sensor has the beneficial effects that the pretension of the fiber bragg grating is realized through the ingenious control of the adjusting bolt, the effect of realizing the negative strain measurement of the fiber bragg grating is achieved, meanwhile, the strain measurement range of the sensor can be flexibly adjusted according to actual needs, the integral structure is simple, the yield is high, the finished product can adjust the negative strain range, the manufacturing cost is low, the applicability is strong, the control precision is higher, and in addition, the radiation resistance of the sensor is good.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic perspective view of a fiber grating package structure according to the present invention;
FIG. 2 is a front view of a fiber grating package structure according to the present invention;
FIG. 3 is a graphical representation of radiation induced Bragg Wavelength Shift (BWS) versus irradiation dose for FBGs inscribed in germanium (Ge) doped and pure quartz core (PSC) fibers;
fig. 4 is a graphical representation of radiation induced BWS versus dose on FBGs written in Ge-doped and PSC fibers using Ultraviolet (UV) and Femtosecond (FS) lasers.
In the figure, the left end plate, the right end plate, the 3-slide plate, the 4-fixed block, the 5-adjusting bolt, the 6-fixed plate, the 7-clamping groove, the 8-dispensing groove, the 9-fixed hole, the 10-upper strip-shaped plate, the 11-lower strip-shaped plate, the 12-upper fastening bolt and the 13-lower fastening bolt are arranged.
Detailed Description
In order that the above objects, features and advantages of the invention will be more clearly understood, a further description of the invention will be made. It should be noted that, without conflict, the embodiments of the present invention and features in the embodiments may be combined with each other.
In the description, it should be noted that the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. It should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, or indirectly connected through an intermediate medium, or may be communication between two elements. The specific meaning of the terms described above will be understood by those of ordinary skill in the art as the case may be.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced otherwise than as described herein, and it is apparent that the embodiments in the specification are only some, rather than all, of the embodiments of the present invention.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1 and 2, an irradiation-resistant fiber bragg grating strain sensor comprises a fiber bragg grating and a fiber bragg grating packaging structure, wherein the fiber bragg grating packaging structure comprises a bottom plate, the left end part of the bottom plate is fixedly provided with a sliding rail, a sliding plate 3 is arranged on the sliding rail in a left-right sliding manner, a positioning fixing piece for positioning and fixing the sliding plate 3 after sliding relative to the sliding rail is arranged on the sliding plate 3 and the sliding rail, the sliding plate 3 is arranged in parallel with the bottom plate, the right end part on the sliding rail is fixedly provided with a fixing block 4, the fixing block 4 is positioned on the right side of the sliding plate 3, a threaded through hole which is axially arranged in the left-right direction is formed in the fixing block, an adjusting bolt 5 for pushing the sliding plate 3 to move leftwards is arranged in the threaded through hole, and a fixing plate 6 which is arranged in parallel with the bottom plate is fixed on the right end part of the bottom plate.
When the device is used, the two ends of the fiber bragg grating are respectively fixed on the sliding plate 3 and the fixed plate 6 in a dispensing mode, the fiber bragg grating is naturally straightened through the sliding plate 3 and the fixed plate 6, the sliding plate 3 is pre-tensioned through the positioning fixing piece (the pre-tensioned, namely, the sliding plate 3 can still slightly move relative to the sliding rail when being pushed after being fastened), then the adjusting bolt 5 is screwed according to the strain range to be tested, the adjusting bolt 5 pushes the sliding plate 3 leftwards to move, finally, the sliding plate 3 is positioned and fixed through the positioning fixing piece, the pre-tensioning of the fiber bragg grating is completed, and the strain measurement of the tested component can be realized only by fixing the bottom plate on the tested component during measurement. In addition, when the strain measurement range is adjusted, the positioning fixing piece is released, so that when the sliding plate 3 is in a freely sliding state relative to the sliding rail, the adjusting bolt 5 is unscrewed, the sliding plate 3 is manually pushed to slide rightwards until the sliding plate contacts with the left end face of the fixing block, the sliding plate 3 is pre-tensioned again through the positioning fixing piece, then the adjusting bolt 5 is screwed according to the strain range to be tested, further the pre-tensioning range of the fiber bragg grating is adjusted, and the strain measurement range is adjusted.
In the specific implementation, the optical fiber adopted by the fiber grating is a single-mode pure quartz fiber core optical fiber and is inscribed by femtosecond laser, so that the irradiation resistance is better.
The principle is that the effect of radiation on differently doped fibers is different in terms of fiber composition. Studies have shown that optical fibers with fluorine doped or single mode pure quartz cores exhibit better radiation resistance than germanium (Ge) doped or phosphorus doped core fibers.
In addition, the irradiation resistance of the fiber bragg grating is also related to the inscription technology of the fiber bragg grating. Conventional fiber grating writing methods generally employ Ultraviolet (UV) laser sources, which are derived from the influence of a linear absorption mechanism, and typically dope high concentrations of Ge or fiber-carried hydrogen in the core region to increase the photosensitivity of the material. The exposure of the Ge-doped silica fiber to a high photon energy uv laser source causes a refractive index change based on color center defects, and the high energy uv radiation improves the radiation resistance of the grating by eliminating the color center precursors, however, the presence of Ge content or additional hydrogen loading makes the fiber more susceptible to high energy ionizing radiation. For the single-mode pure quartz fiber core fiber grating is insensitive to a UV laser light source inscribed by the traditional FBG, the FBG is inscribed in the optical fiber doped with the fiber capable of improving the radiation sensitivity by adopting a femtosecond laser direct writing technology based on non-photosensitivity. The femtosecond laser direct writing technology writes to densify the optical fiber and increase the stress field in the optical fiber, locally increase the material density or increase the permanent mechanical damage, thereby improving the irradiation resistance. The parameters of the writing of the femtosecond laser direct writing technology influence the spectral performance of the FBG, and also influence the material modification, and also influence the interaction of radiation and the laser modified material.
To further confirm the irradiation response of FBG, the analysis is now performed by the following experiment:
Experiment one, using ultra-fast femtosecond laser direct writing technology to write FBG in two different single mode fibers of germanium (Ge) doped fiber and pure quartz core (PSC) fiber with different femtosecond laser powers, exposing FBG to gamma radiation with cumulative dose up to 100kGy (dose rate 3.835 kGy/h), measuring radiation induced Bragg Wavelength Shift (BWS), as shown in figure 3, it can be seen that under normal temperature, FBG is affected by radiation to generate red shift and shows saturation behavior of cumulative irradiation dose. For the low dose region (doses below 10 kGy), the Bragg wavelength increases rapidly and varies almost linearly with the dose. The curve slope of the FBG (FS-PSC-FBG) inscribed in the PSC optical fiber by the femtosecond laser direct writing technology is smaller than that of the FBG (FS-Ge-FBG) inscribed in the Ge-doped optical fiber by the femtosecond laser direct writing technology, wherein the Ge-doped optical fiber contains GeO 2, the radiation sensitivity (BWS change) is higher, and the BWS continuously rises with the increase of the irradiation dose, but the slope is smaller. When the radiation dose reaches about 20kGy, the BWS slowly changes and gradually tends to saturate, and the bragg wavelength stops rising with the increase of the radiation dose, but there is a little fluctuation until the radiation ends. The result shows that the FBG inscribed in the PSC optical fiber has lower Bragg wavelength offset, so the fiber grating adopts the single-mode pure quartz fiber core fiber grating to improve the irradiation resistance.
Experiment two analysis compares the radiation induced BWS versus dose on FBGs written in Ge-doped and PSC fibers using UV and Fs as shown in fig. 4, it can be seen that the radiation induced BWS in UV laser phase mask written FBGs (UV-FBG-Ge) is greater than that induced in femtosecond laser direct write technology written FBGs (Fs-FBG-Ge). The maximum wavelength shift of the FBG inscribed in pure silica core fiber (FS-FBG-PSC) by the femtosecond laser direct writing technique is about 8.964pm, the lowest of the PSC/Ge doped FBGs inscribed by FS or UV. UV-FBG-Ge shows a higher radiation sensitivity, mainly related to the H 2 loading performed before grating writing, enhancing the photosensitivity of the fiber to UV light. FS-FBG-PSC. The refractive index change induced by the femtosecond laser is a multiphoton absorption process through defect state or inter-band absorption, and is related to optical fiber densification, optical fiber internal stress field and defect-related formation. Different responses to irradiation may be due to the different physical modifications of the fiber material by different writing techniques to induce refractive index modulation of the fiber, so that femtosecond laser writing techniques are employed to write FBGs in pure quartz core fibers to improve their irradiation performance.
The utility model provides a fiber bragg grating packaging structure, which comprises a base plate, the left end portion of bottom plate is fixed with the slide rail, slide 3 has been arranged in the left and right sliding on the slide rail, set up the location mounting that is used for slide 3 relative slide rail to slide back location fixed on slide 3 and the slide rail, slide 3 and bottom plate parallel arrangement, right end portion on the slide rail is fixed with fixed block 4, fixed block 4 is located the right side of slide 3, be equipped with its axial for the screw thread through-hole of arranging of left and right directions on the fixed block 4, set up the adjusting bolt 5 (when implementing in particular, the tip of adjusting bolt 5 is equipped with the cross draw-in groove of being convenient for twist) that is used for of promotion slide 3 left movement in the screw thread through-hole, be fixed with on the right end portion of bottom plate with bottom plate parallel arrangement's fixed plate 6.
When the device is used, the two ends of the fiber bragg grating are respectively fixed on the sliding plate 3 and the fixed plate 6 in a dispensing mode, the fiber bragg grating is naturally straightened through the sliding plate 3 and the fixed plate 6, the sliding plate 3 is pre-tensioned through the positioning fixing piece (the pre-tensioned, namely, the sliding plate 3 can still slightly move relative to the sliding rail when being pushed after being fastened), then the adjusting bolt 5 is screwed according to the strain range to be tested, the adjusting bolt 5 pushes the sliding plate 3 leftwards to move, finally, the sliding plate 3 is positioned and fixed through the positioning fixing piece, the pre-tensioning of the fiber bragg grating is completed, and the strain measurement of the tested component can be realized only by fixing the bottom plate on the tested component during measurement. In addition, when the strain measurement range is adjusted, the positioning fixing piece is released, so that when the sliding plate 3 is in a freely sliding state relative to the sliding rail, the adjusting bolt 5 is unscrewed, the sliding plate 3 is manually pushed to slide rightwards until the sliding plate contacts with the left end face of the fixing block, the sliding plate 3 is pre-tensioned again through the positioning fixing piece, then the adjusting bolt 5 is screwed according to the strain range to be tested, further the pre-tensioning range of the fiber bragg grating is adjusted, and the strain measurement range is adjusted.
In specific implementation, the slide rail comprises an upper strip-shaped plate 10 and a lower strip-shaped plate 11, the cross section of the upper strip-shaped plate 10 is in an inverted L shape, the cross section of the lower strip-shaped plate 11 is in an L shape, the upper strip-shaped plate 10 and the lower strip-shaped plate 11 are distributed up and down and are arranged in opposite directions, the upper strip-shaped plate 10 and the lower strip-shaped plate 11 are fixed on the left end plate 1 and respectively form an upper chute and a lower chute with the left end plate 1, and the slide plate 3 is matched with the upper chute and the lower chute. The sliding rail has simple structure and is easy to realize.
In specific implementation, the positioning fixing piece comprises an upper fastening bolt 12 and a lower fastening bolt 13, the top surface of the upper strip-shaped plate 10 is provided with an upper fastening threaded hole which is vertically arranged and matched with the upper fastening bolt 12, and the top surface of the lower strip-shaped plate 11 is provided with a lower fastening threaded hole which is vertically arranged and matched with the lower fastening bolt 13. After the sliding plate 3 slides to the designated position, the positioning and fixing of the sliding plate 3 can be realized only by tightening the upper fastening bolt 12 and the lower fastening bolt 13, and the structure of the positioning and fixing piece is concrete and standardized.
When the device is specifically implemented, the bottom plate comprises a left end plate 1 and a right end plate 2, the left end plate 1 and the right end plate 2 are fixedly connected through an H-shaped plate, so that the fiber bragg grating can respond in time when the tested member generates strain, and the sensitivity of the fiber bragg grating is ensured.
In specific implementation, the bottom plate is provided with the plurality of fixing holes 9, so that spot welding or bolt fixing is conveniently carried out on different parts of the tested member, further, strain measurement is conveniently carried out on different parts of the tested member, strain conditions of the tested member in different areas are comprehensively captured, and therefore more comprehensive data support is provided for analysis of the tested member.
In this embodiment, the slide plate 3 and the fixing plate 6 are respectively provided with a clamping groove 7 for placing the fiber bragg grating, so that the fiber bragg grating is positioned conveniently.
In this embodiment, the slide plate 3 and the fixing plate 6 are also provided with glue dispensing grooves 8 for dispensing the fiber bragg grating conveniently, so that the fiber bragg grating can be dispensed and fixed conveniently.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Although the foregoing embodiments have been described in detail, those skilled in the art will appreciate that modifications may be made to the embodiments described above, or equivalents may be substituted for some or all of the features thereof, without departing from the spirit and scope of the embodiments, and it is intended to cover the scope of the claims.
Claims (9)
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020028034A1 (en) * | 2000-07-27 | 2002-03-07 | Chen Peter C. | Fiber optic strain sensor |
| US7068869B1 (en) * | 2005-01-10 | 2006-06-27 | Francisco Manuel Moita Araujo | Passive athermal fiber bragg grating strain gage |
| CN107202545A (en) * | 2017-06-20 | 2017-09-26 | 西安交通大学 | A kind of temperature self-compensation type fiber Bragg grating strain sensor |
| CN111595256A (en) * | 2020-07-13 | 2020-08-28 | 西北大学 | High temperature fiber optic strain sensor |
| CN115164759A (en) * | 2022-07-28 | 2022-10-11 | 长飞（武汉）光系统股份有限公司 | Ultrahigh-temperature-resistant fiber grating large-strain sensor capable of being subjected to temperature compensation |
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2025
- 2025-02-14 CN CN202510165037.8A patent/CN119958447B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020028034A1 (en) * | 2000-07-27 | 2002-03-07 | Chen Peter C. | Fiber optic strain sensor |
| US7068869B1 (en) * | 2005-01-10 | 2006-06-27 | Francisco Manuel Moita Araujo | Passive athermal fiber bragg grating strain gage |
| CN107202545A (en) * | 2017-06-20 | 2017-09-26 | 西安交通大学 | A kind of temperature self-compensation type fiber Bragg grating strain sensor |
| CN111595256A (en) * | 2020-07-13 | 2020-08-28 | 西北大学 | High temperature fiber optic strain sensor |
| CN115164759A (en) * | 2022-07-28 | 2022-10-11 | 长飞（武汉）光系统股份有限公司 | Ultrahigh-temperature-resistant fiber grating large-strain sensor capable of being subjected to temperature compensation |
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