CN114413947B - Fiber bragg grating sensor capable of realizing temperature self-compensation - Google Patents
Fiber bragg grating sensor capable of realizing temperature self-compensation Download PDFInfo
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- CN114413947B CN114413947B CN202210087585.XA CN202210087585A CN114413947B CN 114413947 B CN114413947 B CN 114413947B CN 202210087585 A CN202210087585 A CN 202210087585A CN 114413947 B CN114413947 B CN 114413947B
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
- G01D5/35309—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer
- G01D5/35316—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer using a Bragg gratings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
- G01D3/036—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves
Abstract
The invention provides a fiber grating sensor capable of realizing temperature self-compensation, which mainly comprises a tubular outer sleeve, a central shaft penetrating through the tubular outer sleeve and a fiber core penetrating through the central shaft; a limiting block is arranged in the middle of the tubular jacket; the central shaft comprises two guide posts and a connecting plate for connecting the two guide posts, the two guide posts of the central shaft are respectively arranged at two ends of the tubular outer sleeve, and the central shaft can slide along the axial direction of the tubular outer sleeve; the bottom surface of the limiting block and the connecting plate are directly provided with a gap; the optical fiber core also penetrates through the limiting block, and two sections of optical fiber gratings with identical structures are written in the optical fiber core. The invention has simple structure, the optical fiber cores and the optical fiber gratings on the two sides of the invention are not affected by each other under the action of the limiting block, the physical increase and decrease amounts of the two optical fiber gratings are opposite and the absolute values are equal, the wavelength reflected by the two optical fiber gratings is averaged, the intermediate value is taken, the error is reduced, and the operation of the physical amounts is carried out through the average value of the wavelength, thereby improving the detection performance of the sensor.
Description
Technical Field
The invention mainly relates to the technical field of optical fiber sensing, in particular to an optical fiber grating sensor capable of realizing temperature self-compensation.
Background
Compared with the conventional electronic and mechanical sensors, the fiber bragg grating sensor has a series of uniqueness; the volume is small, and the weight is light; the fiber grating sensor is embedded into the structure or is arranged on the surface of the structure, so that the performance of the monitored structure is little influenced, the measurement accuracy is high, the transmission frequency bandwidth is wide, the distributed measurement can be realized, the fiber grating sensor can connect a plurality of point sensors in series or in parallel, and the continuous measurement of a plurality of parameters can be realized on one fiber; the fiber grating sensor can be manufactured into sensors suitable for different measured measurements by changing the internal structure of the sensor by adopting a proper means, such as stress, strain, acceleration, temperature, current and the like, has good application prospect, obtains the attention of experts in various fields, and is widely applied to civil engineering structures, aerospace, petroleum, medicine, electric power and other industries.
Since the temperature can cause the change of the refractive index of the grating, thereby affecting the accuracy of the reflection spectrum, most of various fiber grating sensors applied to the market at present simulate and calculate an approximate temperature compensation amount by arranging a temperature grating on a bare fiber, and then offset the influence of the temperature on the grating by the approximate temperature compensation amount; the temperature strain compensation principle is to consider the grating as an unconstrained elastomer, only calculates the expansion (or contraction) amount of a material under the action of temperature, and does not consider that the grating is stuck on the surface of a structure to be tested or the inside of a deeply buried structure under the constraint of an inner member and an outer member, so that the grating cannot deform freely, and the temperature strain of the grating is different from that of the temperature grating under the same condition, and is influenced by the temperature change of a mechanism and other parts and the structure constraint, so that larger errors are caused.
Disclosure of Invention
In the prior art, an approximate temperature compensation amount is calculated by arranging a temperature grating on an optical fiber in a simulation manner, and then the influence of temperature on the grating is counteracted by the approximate temperature compensation amount, but the obtained temperature compensation amount is only an approximate value and cannot accurately eliminate the influence of temperature on the grating.
The technical scheme provided by the invention is as follows:
the invention provides a fiber bragg grating sensor capable of realizing temperature self-compensation, which comprises a tubular outer sleeve, a central shaft penetrating through the tubular outer sleeve and a fiber bragg core penetrating through the central shaft; a limiting block is further arranged in the middle of the tubular outer sleeve; the central shaft comprises two guide posts and a connecting plate for connecting the two guide posts, the two guide posts of the central shaft are respectively arranged at two ends of the tubular jacket, and the central shaft can slide along the axial direction of the tubular jacket; a gap is reserved between the bottom surface of the limiting block and the connecting plate; the optical fiber core also penetrates through the limiting block, two sections of optical fiber gratings with identical structures are written in the optical fiber core, and the two sections of optical fiber gratings are respectively arranged on two sides of the limiting block and are in mirror symmetry with the limiting block as a center.
Preferably, first through holes are formed along the axial direction penetrating through the two guide posts; a second through hole coaxial with the first through hole is formed through the limiting block; strong glue is injected into the first through hole and the second through hole; the optical fiber core penetrates through the powerful glue in the first through hole and the second through hole.
Preferably, one of the guide posts is provided with a third through hole penetrating through the side wall thereof; the third through hole is communicated with the first through hole arranged on the guide post; the third through hole is filled with strong glue; the fiber core is disposed through the third through-hole and perpendicular to a reference horizontal plane.
Preferably, the tubular outer sleeve is internally sleeved with two POM lubrication sleeves; the two POM lubrication sleeves are respectively arranged at two ends of the tubular outer sleeve and are coaxially arranged with the tubular outer sleeve; the two guide posts are respectively sleeved in the two POM lubricating sleeves and slide along the axial direction of the POM lubricating sleeves.
Preferably, the cylindrical surfaces of the two guide posts are respectively provided with an annular limit groove; a POM lubrication ring matched with the limit groove is sleeved in each POM lubrication sleeve; the outer wall of the POM lubrication ring is tightly attached to the inner wall of the POM lubrication sleeve, and drives the central shaft to axially slide along the POM lubrication sleeve; lubricating oil is arranged between the POM lubricating sleeve and the POM lubricating ring; the aperture of the POM lubricating sleeve is equal to that of the tubular outer sleeve; the outer wall of the central shaft and the inner wall of the tubular jacket are spaced apart, and the nearest distance is 1-1.5mm.
Preferably, the tubular jacket, the central shaft, the POM lubricating sleeve and the POM lubricating ring are all made of cemented carbide.
Preferably, screw holes are formed through the wall surface of the tubular jacket; a bolt for installing the limiting block is arranged in the screw hole; the limiting block is provided with a second screw hole matched with the bolt for use.
The fiber bragg grating sensor capable of realizing temperature self-compensation has the following beneficial effects:
1. the structure is simple, under the action of the limiting block, the optical fiber cores and the optical fiber gratings on two sides of the optical fiber grating are not affected by each other, the physical increase and decrease amounts received by the two optical fiber gratings are opposite and equal in absolute value, the wavelength reflected by the two optical fiber gratings is averaged, the intermediate value is taken, the error is reduced, the calculation of the physical amounts is carried out through the average value of the wavelength, and the detection performance of the sensor is improved.
2. The two fiber gratings with identical structures are in strict mirror symmetry, and the two fiber gratings are in the same environment, soAnd->The numerical values are the same; after the effective refractive index of the reflected light and the grating period of the two sections of fiber gratings are changed at the ambient temperature, the effective refractive index of the reflected light is +.>And->Identical, grating period->And->The same, i.e. after a change of the ambient temperature of the sensor, the test wavelength +.>And->Similarly, in the case where the strain coefficient is a fixed value, the influence of the ambient temperature on the change of the corresponding variable is substantially zero; two fiber gratings connected in series form constant-amplitude cancellation to realize the purpose of self-compensation.
Drawings
The invention and its features, aspects and advantages will become more apparent from the detailed description of non-limiting embodiments with reference to the following drawings. Like numbers refer to like parts throughout. The drawings are not intended to be drawn to scale, emphasis instead being placed upon illustrating the principles of the invention.
FIG. 1 is a perspective view of the present invention;
FIG. 2 is an internal perspective view of the present invention;
FIG. 3 is a cross-sectional view of the present invention;
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments in accordance with the present application.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components, and/or groups thereof.
The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention.
The terms "first," "second," "third," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" should be construed broadly, as if they were fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The following description of the technical solutions according to the embodiments of the present invention refers to the accompanying drawings, which are included to illustrate only some embodiments of the invention, and not all embodiments. Accordingly, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to fall within the scope of the present invention.
Examples
In the prior art, most of the temperature grating is arranged on an optical fiber to simulate and calculate an approximate temperature compensation quantity, and then the influence of the temperature on the grating is counteracted by the approximate temperature compensation quantity, but the obtained temperature compensation quantity is only an approximate value and cannot accurately eliminate the influence of the temperature on the grating, in order to solve the technical problems, the embodiment of the invention provides an optical fiber grating sensor capable of realizing temperature self-compensation, which comprises a tubular outer sleeve 1, a central shaft 2 penetrating through the tubular outer sleeve 1 and an optical fiber core 3 penetrating through the central shaft 2; a limiting block 5 is further arranged in the middle of the tubular jacket 1; the central shaft 2 comprises two guide posts 202 and a connecting plate 201 for connecting the two guide posts 202, the two guide posts 202 of the central shaft 2 are respectively arranged at two ends of the tubular outer sleeve 1, and the central shaft 2 can slide along the axial direction of the tubular outer sleeve 1; a gap is reserved between the bottom surface of the limiting block 5 and the connecting plate 201; the optical fiber core 3 also penetrates through the limiting block 5, two sections of optical fiber gratings 8 with identical structures are written in the optical fiber core 3, and the two sections of optical fiber gratings 8 are respectively arranged on two sides of the limiting block 5 and are in mirror symmetry with the limiting block 5 as a center.
According to the optical fiber photosynthetic coupling mode theory, for a common single-mode FBG, the transmission peak expression meeting the Bragg condition is as follows:
in the method, in the process of the invention,the effective refractive index of the reflected light is +.>The grating period is +.>；
The invention relates to an optical fiber surface plasma resonance glucose sensor with temperature self-compensation, which comprises the following steps of:
the total strain value of the two groups of fiber gratings 8 connected in series is calculated by the following steps:
in the method, in the process of the invention,for the value of the strain, +.>And->Test wavelengths of two grating fibers, respectively, < >>And->The first wavelength of the two optical fibers is respectively, and K is a strain coefficient;
the formula (2) is carried into the formula (1), and two groups of gratings are connected in series, wherein the total strain value is calculated in the following way:
because the two fiber gratings 8 with identical structures are strictly mirror symmetrical, the two fiber gratings 8 are in the same environment, soAnd->The numerical values are the same; the effective refractive index of the reflected light of the two-section fiber bragg grating 8 and the effective refractive index of the reflected light are +.>And->Identical, grating period->And->The same, i.e. after a change of the sensor ambient temperature, the test wavelength +.>And->Similarly, in the case where the strain coefficient is a fixed value, the influence of the ambient temperature on the change of the corresponding variable is substantially zero; two fiber gratings 8 connected in series form constant-amplitude offset to realize the purpose of self-compensation。
When the sensor detects the quantity of materials, the relative position of the whole sensor is fixed, the external physical quantity acts on the central shaft 2, the optical fiber cores 3 and the optical fiber gratings 8 on the two sides of the sensor are not affected by each other under the action of the limiting block 5, the physical increase and decrease quantities borne by the two optical fiber gratings 8 are opposite and equal in absolute value, the wavelength reflected by the two optical fiber gratings 8 is averaged to obtain the intermediate value, the error is further reduced, the calculation of the physical quantity is carried out through the average value of the wavelength, and the detection performance of the sensor is improved.
In the actual assembly process, it is difficult to directly embed the optical fiber core 3 into the guide posts, and in this embodiment, it is preferable to provide the first through holes 4 axially penetrating through the two guide posts 202; the penetrating limiting block 5 is provided with a second through hole 6 coaxial with the first through hole 4; the first through hole 4 and the second through hole 6 are internally filled with strong glue 7; the optical fiber core 3 penetrates through the first through hole 4 and the strong adhesive 7 in the second through holes 6, when in assembly, the optical fiber core 3 sequentially penetrates through the first through hole 4 of one guide pillar 202, the second through hole 6 and the first through hole 4 of the other guide pillar, two ends of the optical fiber core are stretched, the optical fiber core 3 is in a tight state, then the strong adhesive 7 is injected into the second through holes 6 and the two first through holes 4, and after the strong adhesive 7 is hardened, the purpose of fixing the optical fiber core 3 is achieved.
In order to avoid the optical fiber core 3 from obstructing the connection of the structure to be measured, in this embodiment, it is preferable that one of the guide posts 202 has a third through hole 11 penetrating through its sidewall; the third through hole 11 is communicated with the first through hole 4 arranged on the guide pillar 202; the third through hole 11 is filled with strong glue 7; the optical fiber core 3 passes through the third through hole 11 and is arranged at the vertical reference level, the external structure to be tested can be directly adhered to the side edge of the guide pillar 202, and can also be sleeved on the outer side wall of the guide pillar 202 in a sleeved mode, and the optical fiber core 3 descending midway can not cause any obstacle to the butt joint of the structure.
In this embodiment, preferably, the tubular jacket 1 is internally sheathed with two POM lubrication sleeves 9; the two POM lubrication sleeves 9 are respectively arranged at two ends of the tubular outer sleeve 1 and are coaxially arranged with the tubular outer sleeve 1; the two guide posts 202 are respectively sleeved in the two POM lubrication sleeves 9 and slide along the axial direction of the POM lubrication sleeves 9; the cylindrical surfaces of the two guide posts 202 are respectively provided with an annular limit groove; a POM lubrication ring 10 matched with a limit groove is sleeved in each POM lubrication sleeve 9; the outer wall of the POM lubrication ring 10 is closely attached to the inner wall of the POM lubrication sleeve 9, and drives the central shaft 2 to axially slide along the POM lubrication sleeve 9; lubricating oil is arranged between the POM lubricating sleeve 9 and the POM lubricating ring 10; the aperture of the POM lubricating sleeve 9 is equal to that of the tubular jacket 1; the outer wall of the central shaft 2 and the inner wall of the tubular jacket 1 are spaced with a nearest distance of 1-1.5mm; the outer wall of the central shaft 2 needs to be smeared with lubricating oil to reduce friction resistance generated during sliding, the central shaft 2 is directly contacted with the inner wall of the tubular outer sleeve 1 relative to the central shaft 2, the central shaft 2 is suspended by supporting the POM lubricating ring 10, the POM lubricating ring 10 is contacted with the POM lubricating sleeve 9, the contact area is reduced, the friction resistance is reduced, and meanwhile, the POM lubricating sleeve 9 can be detached from the main body of the tubular outer sleeve 1 for replacement, so that the replacement cost is reduced.
When the fiber bragg grating 8 sensor is used, the fiber bragg grating 8 sensor is usually embedded into concrete, and materials for manufacturing the tubular outer sleeve 1, the central shaft 2, the POM lubrication sleeve 9 and the POM lubrication ring 10 are all made of hard alloy, and the hard alloy has a series of excellent performances such as high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance and the like, and the fiber bragg grating 8 sensor manufactured by using the hard alloy as the material can meet the working condition requirements of various fields.
When the sensor is assembled, the central shaft 2 is required to be integrally sleeved in the tubular jacket 1, as the limiting block 5 is fixed in the tubular jacket 1, and the gap between the central shaft 2 and the tubular jacket 1 is only 1-1.5mm, the only installation mode is that after the central shaft 2 is sleeved into the guide post 202 at one end, the limiting block 5 is placed on the connecting plate 201 and pushed into the tubular jacket 1 along with the connecting plate 201, the position of the limiting block 5 is adjusted, the limiting block 5 is fixed in the tubular jacket 1, and in order to facilitate the fixing of the limiting block 5, in the implementation, preferably, a screw hole 12 is formed through the wall surface of the tubular jacket 1, a bolt 13 for installing the limiting block 5 is arranged in the screw hole 12, a second screw hole matched with the bolt is also formed at the top of the limiting block 5, and when the two screw holes are opposite, the bolt 13 is screwed in the middle, so that the dismounting of the limiting block 5 can be realized.
The above-described embodiments are merely illustrative of the principles of the present application and their effectiveness, and are not intended to limit the present application. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications and variations which a person having ordinary skill in the art would accomplish without departing from the spirit and technical spirit disclosed in the present patent application shall be covered by the claims of the present patent application.
Claims (6)
1. The fiber bragg grating sensor capable of realizing temperature self-compensation is characterized by comprising a tubular outer sleeve, a central shaft penetrating through the tubular outer sleeve and a fiber bragg core penetrating through the central shaft;
a limiting block is further arranged in the middle of the tubular outer sleeve;
the central shaft comprises two guide posts and a connecting plate for connecting the two guide posts, the two guide posts of the central shaft are respectively arranged at two ends of the tubular jacket, and the central shaft can slide along the axial direction of the tubular jacket;
a gap is reserved between the bottom surface of the limiting block and the connecting plate;
the optical fiber core also penetrates through the limiting block, two sections of optical fiber gratings with the same structure are written in the optical fiber core, and the two sections of optical fiber gratings are respectively arranged on two sides of the limiting block and are in mirror symmetry with the limiting block as a center;
a first through hole is formed along the axial direction penetrating through the two guide posts; a second through hole coaxial with the first through hole is formed through the limiting block;
strong glue is injected into the first through hole and the second through hole; the optical fiber core penetrates through the powerful glue in the first through hole and the second through hole.
2. The fiber grating sensor capable of realizing temperature self-compensation according to claim 1, wherein: one of the guide posts is provided with a third through hole penetrating through the side wall of the guide post; the third through hole is communicated with the first through hole arranged on the guide post; the third through hole is filled with strong glue; the fiber core is disposed through the third through-hole and perpendicular to a reference horizontal plane.
3. The fiber grating sensor capable of realizing temperature self-compensation according to claim 1, wherein: two POM lubrication sleeves are sleeved in the tubular outer sleeve; the two POM lubrication sleeves are respectively arranged at two ends of the tubular outer sleeve and are coaxially arranged with the tubular outer sleeve;
the two guide posts are respectively sleeved in the two POM lubricating sleeves and slide along the axial direction of the POM lubricating sleeves.
4. A fiber grating sensor capable of temperature self-compensation as recited in claim 3, wherein: the cylindrical surfaces of the two guide posts are respectively provided with an annular limiting groove; a POM lubrication ring matched with the limit groove is sleeved in each POM lubrication sleeve;
the outer wall of the POM lubrication ring is tightly attached to the inner wall of the POM lubrication sleeve, and drives the central shaft to axially slide along the POM lubrication sleeve; lubricating oil is arranged between the POM lubricating sleeve and the POM lubricating ring;
the aperture of the POM lubricating sleeve is equal to that of the tubular outer sleeve; the outer wall of the central shaft and the inner wall of the tubular jacket are spaced apart, and the nearest distance is 1-1.5mm.
5. The fiber grating sensor capable of realizing temperature self-compensation according to claim 4, wherein: the tubular jacket, the central shaft, the POM lubrication sleeve and the POM lubrication ring are all made of hard alloy.
6. The fiber grating sensor capable of realizing temperature self-compensation according to claim 1, wherein: screw holes are formed through the wall surface of the tubular outer sleeve; a bolt for installing the limiting block is arranged in the screw hole; the limiting block is provided with a second screw hole matched with the bolt for use.
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| CN202210087585.XA CN114413947B (en) | 2022-01-25 | 2022-01-25 | Fiber bragg grating sensor capable of realizing temperature self-compensation |
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| CN202210087585.XA CN114413947B (en) | 2022-01-25 | 2022-01-25 | Fiber bragg grating sensor capable of realizing temperature self-compensation |
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| CN213067478U (en) * | 2020-10-07 | 2021-04-27 | 沈阳建筑大学 | Double-fiber grating tilt angle sensor based on sliding block bearing |
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| CN2578832Y (en) * | 2002-11-14 | 2003-10-08 | 钟少龙 | Temperature self-compensated differential optical fibre acceleration sensor probe |
| JP2009222397A (en) * | 2008-03-13 | 2009-10-01 | Anritsu Corp | Optical fiber sensor and measuring device |
| CN101526339A (en) * | 2009-04-22 | 2009-09-09 | 东南大学 | Temperature self-compensation fiber grating displacement sensor |
| CN101852643A (en) * | 2010-05-25 | 2010-10-06 | 中国人民解放军国防科学技术大学 | Temperature self-compensating double grating symmetrical push-pull type fiber grating vibrating sensor |
| CN107328369A (en) * | 2017-06-22 | 2017-11-07 | 石家庄铁道大学 | Fiber Bragg grating strain sensor |
| CN108507474A (en) * | 2018-04-11 | 2018-09-07 | 河南科技大学 | A kind of temperature self-compensation fiber grating displacement sensor and its application method |
| CN213067478U (en) * | 2020-10-07 | 2021-04-27 | 沈阳建筑大学 | Double-fiber grating tilt angle sensor based on sliding block bearing |
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