CN114413947A - Fiber grating sensor capable of realizing temperature self-compensation - Google Patents
Fiber grating sensor capable of realizing temperature self-compensation Download PDFInfo
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- CN114413947A CN114413947A CN202210087585.XA CN202210087585A CN114413947A CN 114413947 A CN114413947 A CN 114413947A CN 202210087585 A CN202210087585 A CN 202210087585A CN 114413947 A CN114413947 A CN 114413947A
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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
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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 also 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 outer sleeve, and the central shaft can slide along the axial direction of the tubular outer sleeve; a gap is directly reserved between the bottom surface of the limiting block and the connecting plate; the fiber core of the optical fiber also penetrates through the limiting block, and two sections of fiber gratings with the same structure are written on the fiber core of the optical fiber. The fiber bragg grating sensor is simple in structure, the fiber cores and the fiber bragg gratings on the two sides of the fiber bragg gratings are not affected by each other under the action of the limiting block, the physical increase and decrease quantities borne by the two fiber bragg gratings are opposite and the absolute values of the two fiber bragg gratings are equal, the wavelengths reflected by the two fiber bragg gratings are averaged, the middle value is taken, the error is reduced, the physical quantity is calculated through the average wavelength value, and the detection performance of the sensor is improved.
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 grating sensor has a series of unique points; the volume is small and the weight is light; the fiber grating sensor is embedded in the structure or arranged on the surface of the structure, has little influence on the performance of the monitored structure, high measurement precision and wide transmission frequency band, and can realize distributed measurement; the fiber grating sensor can change the internal structure of the sensor by adopting a proper means to manufacture the sensor suitable for different measured measurements, 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 industries such as civil engineering structure, aerospace, petroleum, medicine, electric power and the like.
Because the temperature can cause the refractive index of the grating to change, thereby affecting the accuracy of the reflection spectrum, most of various fiber grating sensors applied in the market at present can simulate and calculate an approximate temperature compensation quantity by arranging a temperature grating on a bare fiber, and further counteract the influence of the temperature on the grating through the approximate temperature compensation quantity, but because the temperature compensation quantity is simulated and calculated on the temperature grating, the obtained temperature compensation quantity is only an approximate value, and the influence of the temperature on the grating can not be accurately eliminated, so the accuracy and the stability of the sensor based on the temperature compensation mode are both limited by nature; the temperature strain compensation principle is that the grating is regarded as an unconstrained elastic body, only the expansion (or contraction) quantity of a material is calculated under the action of temperature, the constraint of an inner member and an outer member is not considered, the grating is adhered to the surface of a structure to be measured or is deeply buried in the structure and cannot be freely deformed, the temperature strain of the grating and the temperature grating is different under the same condition, and the grating and the temperature grating are influenced by the temperature change of mechanisms and other parts and the structural constraint, so that a large error is caused.
Disclosure of Invention
In the prior art, most of the fiber grating sensors are provided with a temperature grating to calculate an approximate temperature compensation quantity in a simulation mode, and then the influence of temperature on the grating is counteracted through the approximate temperature compensation quantity.
The technical scheme provided by the invention is as follows:
the invention provides a fiber 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 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 outer sleeve, and the central shaft can slide along the axial direction of the tubular outer sleeve; a gap is directly reserved between the bottom surface of the limiting block and the connecting plate; the optical fiber core penetrates through the limiting block, two sections of optical fiber gratings with the same structure are written on the optical fiber core, and the two sections of optical fiber gratings are arranged on two sides of the limiting block respectively and are in mirror symmetry by taking the limiting block as a center.
Preferably, a first through hole penetrates through the two guide pillars along the axial direction; a second through hole which is 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 fiber core penetrates through the super glue in the first through hole and the second through hole.
Preferably, one of the guide pillars 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 pillar; strong glue is filled in the third through hole; and the fiber core of the optical fiber penetrates through the third through hole and is arranged vertical to the reference horizontal plane.
Preferably, two POM lubricating sleeves are sleeved inside the tubular outer sleeve; the two POM lubricating 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 pillars are respectively provided with an annular limiting groove; each POM lubricating sleeve is internally sleeved with a POM lubricating ring used in cooperation with the limiting groove; the outer wall of the POM lubricating ring is arranged in a manner of clinging to the inner wall of the POM lubricating sleeve, and the central shaft is driven to slide along the axial direction of the POM lubricating sleeve; lubricating oil is arranged between the POM lubricating sleeve and the POM lubricating ring; the pore diameter of the POM lubricating sleeve is equal to that of the tubular outer sleeve; and a space is reserved between the outer wall of the central shaft and the inner wall of the tubular jacket, and the closest distance is 1-1.5 mm.
Preferably, the tubular outer sleeve, the central shaft, the POM lubricating sleeve and the POM lubricating ring are all made of cemented carbide.
Preferably, a screw hole is formed through the wall surface of the tubular outer sleeve; a bolt for mounting 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 grating sensor capable of realizing temperature self-compensation provided by the invention has the following beneficial effects:
1. the structure is simple, the fiber cores and the fiber gratings on two sides of the fiber grating are not affected by each other under the action of the limiting block, the physical increase and decrease quantities received by the two fiber gratings are opposite, the absolute values of the two fiber gratings are equal, the wavelengths reflected by the two fiber gratings are averaged, the intermediate value is taken, the error is reduced, the physical quantity is calculated through the average wavelength value, and the detection performance of the sensor is improved.
2. The two optical fiber gratings with the same structure are in strict mirror symmetry, and the two optical fiber gratings are in the same environment, so that the lambda is the samea0And λb0The numerical values are the same; the effective refractive index of reflected light and the grating period of the two fiber gratings are changed at the ambient temperatureEffective refractive index n of reflected lighteff,aAnd neff,bSame grating period lambdaaAnd ΛbSame, i.e. measuring wavelength lambda after a change in the ambient temperature of the sensoraAnd λbSimilarly, in the case of a constant strain coefficient, the effect of the ambient temperature on the change of the corresponding variable is substantially zero; the two fiber gratings connected in series form equal-amplitude offset, so that the purpose of self-compensation is realized.
Drawings
The invention and its features, aspects and advantages will become more apparent from reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements. The drawings are not necessarily 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 a perspective view of the interior of the present invention;
FIG. 3 is a cross-sectional view of the present invention;
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. 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 example embodiments according to 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 combinations thereof.
As used herein, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in the positional or orientational relationship illustrated in the figures to facilitate the description of the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention.
The appearances of the terms first, second, and third, if any, are used for descriptive purposes only and are not intended to be limiting or imply relative importance.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The technical solutions in the embodiments of the present invention are described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. Thus, the following detailed description of the embodiments of the present invention, 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 derived by a person skilled in the art from the embodiments of the invention without making creative efforts, belong to the protection scope of the invention.
Examples
In the prior art, mostly, a temperature grating is embedded in an optical fiber to calculate an approximate temperature compensation amount in a simulation manner, and then the influence of temperature on the grating is offset 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, in order to solve the above technical problems, an embodiment of the present invention provides an optical fiber grating sensor capable of realizing temperature self-compensation, which includes 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 outer sleeve 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 directly reserved between the bottom surface of the limiting block 5 and the connecting plate 201; the optical fiber core 3 further penetrates through the limiting block 5, two optical fiber gratings 8 with the same structure are written in the optical fiber core 3, and the two 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 satisfying the Bragg condition is as follows:
λ＝2neffΛ (1)
wherein λ is the central wavelength, and the effective refractive index of the reflected light is neffThe grating period is Λ;
the invention discloses an optical fiber surface plasma resonance glucose sensor with temperature self-compensation, which comprises the following steps that the temperature is measured by an optical fiber grating 8 for temperature compensation:
the calculation mode of the total strain value of the two groups of fiber gratings 8 connected in series is as follows:
in the formula, muεIs a strain value, λaAnd λbRespectively, the test wavelengths, λ, of the two grating fibersa0And λb0The initial wavelength of two optical fibers is respectively, and K is a strain coefficient;
the calculation method of the total strain value of the two groups of gratings connected in series by taking the formula (2) into the formula (1) is as follows:
because the two optical fiber gratings 8 with the same structure are in strict mirror symmetry and the two optical fiber gratings 8 are in the same environment, the lambda isa0And λb0The numerical values are the same; the effective refractive index n of the reflected light of the two fiber gratings 8 is changed after the ambient temperature changeseff,aAnd neff,bSame grating period lambdaaAnd ΛbSame, i.e. measuring the wavelength lambda after a change in the ambient temperature of the sensoraAnd λbSimilarly, in the case of a constant strain coefficient, the effect of the ambient temperature on the change of the corresponding variable is substantially zero; the two serially connected fiber gratings 8 form equal-amplitude offset to realize the purpose of self-compensation.
When the sensor detects the material quantity, the relative position of the whole sensor is fixed, external physical quantity acts on the central shaft 2, the fiber cores 3 and the 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 increment and decrement of the two fiber gratings 8 are opposite and the absolute values of the two fiber gratings are equal, the wavelengths reflected by the two fiber gratings 8 are averaged, the intermediate value is taken, the error is further reduced, the operation of the physical quantity is carried out through the average value of the wavelengths, 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 that the first through holes 4 are formed to penetrate the two guide posts 202 in the axial direction; a second through hole 6 coaxial with the first through hole 4 is arranged through the limiting block 5; strong glue 7 is injected into the first through hole 4 and the second through hole 6; the optical fiber core 3 penetrates through the super glue 7 in the first through hole 4 and the second through hole 6, during assembly, the optical fiber core 3 sequentially penetrates through the first through hole 4 and the second through hole 6 of one guide pillar 202 and the first through hole 4 of the other guide pillar, the two ends of the optical fiber core are stretched, the optical fiber core 3 is in a tightened state, then the super glue 7 is injected into the second through hole 6 and the two first through holes 4, and after the super glue 7 is hardened, the purpose of fixing the optical fiber core 3 is achieved.
When measuring each physical quantity, one end of the central shaft 2 is taken as an output end, so as to avoid the optical fiber core 3 from obstructing the connection of the structure to be measured, preferably in the present implementation, one of the guide pillars 202 is provided with a third through hole 11 penetrating through the side wall thereof; the third through hole 11 is communicated with a first through hole 4 arranged on the guide pillar 202; the third through hole 11 is filled with super glue 7; the optical fiber core 3 penetrates through the third through hole 11 and is arranged vertical to the reference horizontal plane, an external structure to be detected can be directly adhered to the side edge of the guide pillar 202, the external structure to be detected 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 cannot cause any obstacle to the butt joint of the structures.
In the present embodiment, preferably, two POM lubrication sleeves 9 are sleeved inside the tubular outer sleeve 1; the two POM lubricating 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 lubricating sleeves 9 and slide along the axial direction of the POM lubricating sleeves 9; the cylindrical surfaces of the two guide pillars 202 are respectively provided with an annular limiting groove; each POM lubricating sleeve 9 is internally sleeved with a POM lubricating ring 10 used in cooperation with the limiting groove; the outer wall of the POM lubricating ring 10 is tightly attached to the inner wall of the POM lubricating sleeve 9, and drives the central shaft 2 to slide along the axial direction of the POM lubricating sleeve 9; lubricating oil is arranged between the POM lubricating sleeve 9 and the POM lubricating ring 10; the pore diameter of the POM lubricating sleeve 9 is equal to that of the tubular outer sleeve 1; a space is reserved between the outer wall of the central shaft 2 and the inner wall of the tubular outer sleeve 1, and the closest distance is 1-1.5 mm; the outer wall of the central shaft 2 needs to be coated with lubricating oil to reduce frictional resistance generated during sliding, and compared with the direct contact between the central shaft 2 and the inner wall of the tubular jacket 1, the POM lubricating ring 10 supports the central shaft 2, the central shaft 2 is suspended, the POM lubricating ring 10 is in contact with the POM lubricating sleeve 9, the contact area is reduced, the frictional resistance is reduced, meanwhile, the POM lubricating sleeve 9 can be detached from the main body of the tubular jacket 1 to be replaced, and the replacement cost is reduced.
When the fiber grating 8 sensor is used, the fiber grating 8 sensor is usually embedded into concrete, the materials for manufacturing the tubular outer sleeve 1, the central shaft 2, the POM lubricating sleeve 9 and the POM lubricating ring 10 are all hard alloy, 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 grating 8 sensor manufactured by using the hard alloy as the material can be suitable for the working condition requirements of various fields.
When the sensor is assembled, the central shaft 2 is integrally sleeved in the tubular jacket 1, because the limiting block 5 is fixed in the tubular outer sleeve 1, and the gap between the central shaft 2 and the tubular outer sleeve 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 and fixed inside the tubular jacket 1, so as to facilitate the fixation of the limiting block 5, in this implementation preferably, the wall surface that runs through tubulose overcoat 1 is equipped with screw 12, is equipped with the bolt 13 that is used for installing stopper 5 in the screw 12, and stopper 5 top also is equipped with the second screw that the cooperation bolt used, during the installation, is relative with two screws, and the middle bolt 13 of twisting, can realize stopper 5's dismantlement.
The above-described embodiments are merely illustrative of the principles and utilities of the present patent application and are not intended to limit the present patent application. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of this patent application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of the present application.
Claims (7)
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 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 outer sleeve, and the central shaft can slide along the axial direction of the tubular outer sleeve;
a gap is directly reserved between the bottom surface of the limiting block and the connecting plate;
the optical fiber core penetrates through the limiting block, two sections of optical fiber gratings with the same structure are written on the optical fiber core, and the two sections of optical fiber gratings are arranged on two sides of the limiting block respectively and are in mirror symmetry by taking the limiting block as a center.
2. The fiber grating sensor capable of realizing temperature self-compensation according to claim 1, wherein: a first through hole penetrates through the two guide pillars along the axial direction; a second through hole which is 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 fiber core penetrates through the super glue in the first through hole and the second through hole.
3. 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 pillar; strong glue is filled in the third through hole; and the fiber core of the optical fiber penetrates through the third through hole and is arranged vertical to the reference horizontal plane.
4. The fiber grating sensor capable of realizing temperature self-compensation according to claim 1, wherein: two POM lubricating sleeves are sleeved inside the tubular outer sleeve; the two POM lubricating 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.
5. The fiber grating sensor capable of realizing temperature self-compensation according to claim 4, wherein: the cylindrical surfaces of the two guide pillars are respectively provided with an annular limiting groove; each POM lubricating sleeve is internally sleeved with a POM lubricating ring used in cooperation with the limiting groove;
the outer wall of the POM lubricating ring is arranged in a manner of clinging to the inner wall of the POM lubricating sleeve, and the central shaft is driven to slide along the axial direction of the POM lubricating sleeve; lubricating oil is arranged between the POM lubricating sleeve and the POM lubricating ring;
the pore diameter of the POM lubricating sleeve is equal to that of the tubular outer sleeve; and a space is reserved between the outer wall of the central shaft and the inner wall of the tubular jacket, and the closest distance is 1-1.5 mm.
6. The fiber grating sensor capable of realizing temperature self-compensation according to the claims 1-5, wherein: the tubular outer sleeve, the central shaft, the POM lubricating sleeve and the POM lubricating ring are made of hard alloy.
7. The fiber grating sensor capable of realizing temperature self-compensation according to claim 1, wherein: a screw hole is arranged through the wall surface of the tubular outer sleeve; a bolt for mounting 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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| JP2009222397A (en) * | 2008-03-13 | 2009-10-01 | Anritsu Corp | Optical fiber sensor and measuring device |
| 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 |
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