CN214747941U - Fiber grating inclination sensor - Google Patents
Fiber grating inclination sensor Download PDFInfo
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- CN214747941U CN214747941U CN202121348773.0U CN202121348773U CN214747941U CN 214747941 U CN214747941 U CN 214747941U CN 202121348773 U CN202121348773 U CN 202121348773U CN 214747941 U CN214747941 U CN 214747941U
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- capillary
- grating
- fiber bragg
- capillary tube
- bragg grating
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- 239000000835 fiber Substances 0.000 title claims abstract description 48
- 239000012634 fragment Substances 0.000 claims 1
- 239000013307 optical fiber Substances 0.000 abstract 3
- 230000007774 longterm Effects 0.000 abstract 1
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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Abstract
The utility model discloses a fiber grating inclination sensor for the slope of building is measured and slope or artifical slope determination of sliding position and deformation direction belongs to sensing technical field. The fiber bragg grating sensor comprises a first fiber bragg grating, a second fiber bragg grating, a first capillary tube, a second capillary tube, a third capillary tube, a pendulum bob, an elastic sheet, a support, a shell, a plug, a limiting piece and the like. The double gratings are used as sensitive elements, so that the temperature self-compensation of the sensor can be realized. The middle points of the first optical fiber Bragg grating and the second optical fiber Bragg grating of the double grating are connected with the pendulum bob through the second capillary tube, the pendulum bob is connected with the support through the elastic piece, the two ends of the double grating are fixed on the support through the first capillary tube and the third capillary tube, the support is fixed with the shell, and the grating extends out of the sensor through the plug and the optical fiber protection tube. The change through the casing position can realize the inclination and measure, the utility model discloses self has that anti thunderbolt performance is good, and anti-electromagnetic interference is strong, and is explosion-proof, and long-term operational reliability is good, simple to operate's advantage.
Description
Technical Field
The utility model relates to a sensing technology field specifically is a fiber grating tilt sensor.
Background
The fiber Bragg grating sensing technology is realized based on the change of main parameters such as the effective refractive index and the period of the fiber Bragg grating along with external physical quantities, because the change of the physical quantities can cause the periodic change of the effective refractive index, the wavelength of the fiber Bragg grating changes, and the detection of the external physical quantities is realized. Compared with the traditional piezoelectric sensor, the sensor has the following advantages: the sensor has the advantages of high sensitivity, no electromagnetic interference, good environmental adaptability (high temperature resistance, corrosion resistance and passivity), simple structure, integration of information sensing and information transmission and the like.
SUMMERY OF THE UTILITY MODEL
The utility model provides a not enough to prior art, the utility model provides a fiber grating inclination sensor can realize the fiber grating inclination sensor of remote monitoring, has good reliability, and the type is little, simple to operate, advantage that measurement accuracy is high.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the utility model provides a fiber grating inclination sensor, includes the shell, its characterized in that: the fiber bragg grating sensor comprises a shell and is characterized in that a support and a pendulum bob are arranged inside the shell, an elastic sheet is arranged between the pendulum bob and the support, a first capillary tube and a third capillary tube are fixed on the support, a second capillary tube is fixed on the pendulum bob, a first fiber bragg grating and a second fiber bragg grating are respectively fixed in the first capillary tube and the third capillary tube, and one ends of the two fiber bragg gratings extend into the second capillary tube to be connected to form a fiber string.
Preferably, two limiting parts are installed on two sides of the housing through threads, and one ends of the two limiting parts extending into the housing clamp and fix the pendulum.
Preferably, the support is in an n-shaped structure, and the first capillary and the third capillary are respectively arranged at the bottoms of two sides.
Preferably, the pendulum has a convex middle part, the bracket has a convex middle part, the spring is arranged between the two convex parts, and the second capillary is fixed on the convex parts of the pendulum.
Preferably, the first capillary, the second capillary and the third capillary are located on the same straight line.
Preferably, plugs are fixed to two sides of the housing, and the first fiber bragg grating and the second fiber bragg grating extend to the outer side of the housing through the plugs.
The utility model provides a fiber grating inclination sensor. The method has the following beneficial effects:
(1) the fiber grating tilt sensor 1 uses a pendulum bob, an elastic sheet, a grating string and a bracket to form a swing rod system, and converts the position deviation generated by the bracket into axial strain of the grating string. The sensitivity of the sensor can be adjusted by changing the mass of the pendulum and the shape and rigidity of the elastic sheet.
2. The present case adopts two grating structures, respectively lays a grating on both sides about the pendulum, and when externally object took place the slope, two FBGs took place respectively and draw strain and compressive strain, and the wavelength change is opposite, and two FBGs's temperature sensitivity is the same, and two FBGs's central wavelength difference does not receive the temperature to influence, can realize the accurate measurement of inclination.
3. The scheme adopts three capillaries to finish the packaging of the grating string, simplifies the packaging process of the sensor, and makes the prestress adjustment of the grating easier and facilitates the assembly of the sensor when the sensor is assembled.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: the device comprises a plug 1, a shell 2, a first capillary tube 3, a support 4, a first fiber Bragg grating 5, a spring plate 6, a second capillary tube 7, a second fiber Bragg grating 8, a third capillary tube 9, a pendulum bob 10 and a limiting piece 11.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
Referring to fig. 1, the present invention provides a technical solution: a fiber bragg grating inclination sensor comprises a plug 1, a shell 2, a first third capillary tube, a support 4, a first fiber bragg grating 5, an elastic sheet 6, a second capillary tube 7, a second fiber bragg grating 8, a third capillary tube 9, a pendulum bob 10 and a limiting piece 11.
Specifically, the top of the inner wall of the housing 2 is fixed with the bracket 4, and the inside of the housing 2 is fixed with the pendulum bob 10. Pendulum 10 is located below bracket 4. The bracket 4 has an "n" shape, and the middle portion of the bracket 4 is slightly convex. The pendulum 10 has a block shape, and a middle portion of the pendulum 10 is projected to extend to the inside of the bracket 4. The first capillary 3 and the third capillary 9 are bonded to both ends of the holder 4. The pendulum 10 has a second capillary 7 fixed to a convex portion thereof. A spring plate 6 is arranged between the pendulum 10 and the convex part in the middle of the bracket 4. The two sides of the shell 2 are fixed with plugs 1. The plug 1, the first capillary 3, the second capillary 7 and the third capillary 9 are positioned on the same straight line. The first fiber bragg grating 5 and the second fiber bragg grating 8 are respectively fixed between the first and second capillaries and between the second and third capillaries. The other ends of the two fiber Bragg gratings are connected through a second capillary 7 to form a grating string. The first fiber bragg grating 5 and the second fiber bragg grating 8 extend to the outside of the housing 2 by means of the bulkhead 1 and the fiber protection tube. Slope measurement is achieved by changes in the position of the housing.
The two sides of the housing 2 are provided with a limiting member 11. The limiting members 11 are fixed by bolts, and the pendulum bob 10 is limited in the working area of the housing 2 by the arrangement of the two limiting members 11.
When the device is used, after the sensor receives an inclination change signal of an external object, a swing rod system consisting of the grating string, the pendulum bob 10, the elastic sheet 6 and the bracket 4 can cause a position deviation signal. When the outer shell 2 inclines along with an external object, the support 4 fixed on the outer shell also inclines along with the shell, the pendulum bob 10 is vertically downward under the action of gravity, and the first capillary tube and the third capillary tube at the left end and the right end of the grating string are fixed on the support, while the second capillary tube is fixed on the pendulum bob, so that when the external object inclines, the first fiber Bragg grating 5 and the second fiber Bragg grating 8 of the grating string respectively generate axial strain, the directions are opposite, namely one grating generates tensile strain and the other grating generates compressive strain. Since the amount of strain of the grating is proportional to the amount of change in the reflected wavelength, the tilt of the external object can be ascertained by detecting the amount of change in the wavelength.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (6)
1. A fiber grating tilt sensor comprising a housing (2), characterized in that: the utility model discloses a fiber bragg grating sensor, including shell (2), pendulum (10), shell (2), first capillary (3) and third capillary (9) are fixed respectively to the inside support (4) and pendulum (10) that set up between pendulum (10) and the support (4), set up shell fragment (6), fixed first capillary (3) and third capillary (9) on support (4), fixed second capillary (7) on pendulum (10), fixed first fiber bragg grating (5) and second fiber bragg grating (8) respectively in first capillary (3) and third capillary (9), the one end of two fiber bragg gratings extends to second capillary (7) in-connection and constitutes the optic fibre cluster.
2. The fiber grating tilt sensor of claim 1, wherein: two limiting parts (11) are installed on two sides of the shell (2) through threads, and one end, extending into the shell (2), of each limiting part (11) clamps and fixes the pendulum (10).
3. The fiber grating tilt sensor of claim 1, wherein: the support (4) is of an n-shaped structure, and the first capillary tube (3) and the third capillary tube (9) are respectively arranged at the bottoms of two sides.
4. A fiber grating tilt sensor according to claim 3, wherein: the middle part of the pendulum bob (10) is convex, the middle part of the bracket (4) is also convex, the elastic sheet (6) is arranged between the two convex parts, and the second capillary tube (7) is fixed on the convex parts of the pendulum bob (10).
5. The fiber grating tilt sensor of claim 4, wherein: the first capillary (3), the second capillary (7) and the third capillary (9) are positioned on the same straight line.
6. The fiber grating tilt sensor of claim 5, wherein: the plug (1) is fixed on two sides of the shell (2), and the first fiber Bragg grating (5) and the second fiber Bragg grating (8) penetrate through the plug (1) and extend to the outer side of the shell (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121348773.0U CN214747941U (en) | 2021-06-17 | 2021-06-17 | Fiber grating inclination sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121348773.0U CN214747941U (en) | 2021-06-17 | 2021-06-17 | Fiber grating inclination sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214747941U true CN214747941U (en) | 2021-11-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121348773.0U Expired - Fee Related CN214747941U (en) | 2021-06-17 | 2021-06-17 | Fiber grating inclination sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214747941U (en) |
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2021
- 2021-06-17 CN CN202121348773.0U patent/CN214747941U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211116 |