CN219829781U - Tensile surface-mounted fiber bragg grating strain sensor - Google Patents
Tensile surface-mounted fiber bragg grating strain sensor Download PDFInfo
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- CN219829781U CN219829781U CN202321197569.2U CN202321197569U CN219829781U CN 219829781 U CN219829781 U CN 219829781U CN 202321197569 U CN202321197569 U CN 202321197569U CN 219829781 U CN219829781 U CN 219829781U
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- strain sensor
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- 239000000835 fiber Substances 0.000 title claims abstract description 36
- 239000002184 metal Substances 0.000 claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims abstract description 22
- 239000013307 optical fiber Substances 0.000 claims abstract description 18
- 230000001681 protective effect Effects 0.000 claims abstract description 18
- 238000009434 installation Methods 0.000 claims abstract description 17
- 239000007769 metal material Substances 0.000 claims abstract description 8
- 238000007906 compression Methods 0.000 claims description 17
- 230000006835 compression Effects 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 3
- 229920006351 engineering plastic Polymers 0.000 claims description 2
- 238000004382 potting Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 238000004806 packaging method and process Methods 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000002788 crimping Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Optical Transform (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The utility model relates to the technical field of fiber bragg grating strain sensors, in particular to a tensile surface-mounted fiber bragg grating strain sensor. Including the protective housing, the fixedly connected with installation casing is all dismantled at the both ends of protective housing, all can dismantle fixedly connected with on the installation casing and compress tightly the external member, and the optical cable runs through the protective housing, installation casing and compress tightly the external member, and the cover is equipped with the metal protection tube outside the protective housing, the protective housing includes the strain shell, and the fixedly connected with fastening casing is all dismantled at the both ends of strain shell, all installs the tubular metal resonator in the fastening casing, and fastening casing passes through holding screw fastening with its inside tubular metal resonator, and the optical fiber part of optical cable is naked in the protective housing, and it has grating and forms the fiber grating district to carve in the naked optical fiber part in the strain shell, is fixed with the mount pad on the installation casing. The strain shell adopts the elastic metal material, and has the advantages of high detection precision and repeatable strain monitoring.
Description
Technical Field
The utility model relates to the technical field of fiber bragg grating strain sensors, in particular to a tensile surface-mounted fiber bragg grating strain sensor.
Background
The optical fiber grating is a diffraction grating formed by axially and periodically modulating the refractive index of an optical fiber core by a certain method, and is a passive filter device. The grating optical fiber has the advantages of small volume, small welding loss, full compatibility with optical fiber, capability of embedding intelligent materials and the like, and the resonance wavelength is sensitive to the change of external environments such as temperature, strain, refractive index, concentration and the like, so that the grating optical fiber is widely applied to the fields of optical fiber lasers, optical fiber communication and sensing.
The strain sensitive element of the fiber grating strain sensor is a grating with a given reflection wavelength, the fiber grating is packaged in a base by using a high-temperature-resistant adhesive, so that the fiber grating is always kept in a tensioning state in the strain change process, and the two ends of the sensor are connected with a properly protected signal transmission optical cable. The sensor can convert the measured strain into a readable electric signal.
The fiber bragg grating strain sensor is an optical sensor with high practical value, and has the main application directions of being oriented to bridge and building structure detection and evaluation and on-line monitoring, large-scale complex structure deformation monitoring of bridges, tunnels, buildings and the like, concrete and steel structure surface strain measurement, petrochemical, power supply facility monitoring and the like.
The existing packaging structure of the fiber bragg grating strain sensor comprises a substrate type packaging, a metal thin sleeve packaging, two ends clamping and fixing packaging, and the structure packaging is carried out by using an adhesive technology in the manufacturing process of the sensor. The fiber bragg grating strain sensor manufactured by the method has weak tensile property, and the optical cable is easily broken in actual engineering construction.
Disclosure of Invention
The utility model aims to solve the technical problem that the fiber bragg grating strain sensor has good tensile property and can improve the environmental resistance of the sensor in severe environments.
In order to achieve the above purpose, the technical scheme provided by the utility model is as follows:
a tensile surface-mounted fiber grating strain sensor comprises an optical cable, wherein a grating is engraved on the exposed fiber part of the optical cable, and a fiber grating area is formed and used for strain detection. The fiber grating area is positioned in the strain shell, the strain shell is of a spring-shaped structure made of elastic metal materials, two ends of the strain shell are in threaded connection with the fastening shell, the fastening shell is fastened with the metal tube through a set screw, one end of the fastening shell is in threaded connection with the mounting shell, and the strain shell and the fastening shell are mechanically protected through a metal protection tube.
The optical cable of installation casing one end is overlapped and is equipped with the external member that compresses tightly, it includes FC stop casing to compress tightly the external member cover of external member that FC stops is equipped with the FC crimping cover, and the one end and the FC stop casing threaded connection of installation casing, FC stop casing and FC crimping cover press-fit fix on the optical cable.
Compared with the prior art, the utility model has the beneficial effects that:
1. the strain shell adopts the elastic metal material, and has the advantages of high detection precision and repeatable strain monitoring.
2. The optical cable and the compression sleeve member are subjected to anti-pulling treatment through a compression process, and compared with the conventional adhesive, the anti-pulling performance of the sensor is improved, and the environmental resistance of the sensor in a severe environment is improved.
3. The sensor adopts integrated packaging, improves the structural reliability of products, reduces the damage of the external environment to the sensor, and prolongs the service life.
Drawings
Fig. 1 is a partial cross-sectional view of the present utility model.
Fig. 2 is a schematic view of a mounting base.
The names of the parts in the drawings are as follows:
1 mounting case
2 fastening shell
3 metal protection tube
4 strain shell
5 Metal pipe
6 holding screw
7 FC stop shell
8 FC press-connection sleeve
9 tail sleeve
10 optical cable
11 fiber grating region
12 upper base
13 a lower base.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.
Referring to fig. 1-2, a tensile surface mounting type fiber bragg grating strain sensor comprises a protective shell, wherein two ends of the protective shell are detachably and fixedly connected with an installation shell 1, the installation shell 1 is detachably and fixedly connected with a compression sleeve, an optical cable 10 penetrates through the protective shell, the installation shell 1 and the compression sleeve, the compression sleeve compresses the optical cable 10, and a metal protection tube 3 is sleeved outside the protective shell.
The protective shell comprises a strain shell 4, and the strain shell 4 is a spring-shaped structure made of elastic metal materials. The two ends of the strain shell 4 are detachably and fixedly connected with the fastening shell 2, and the strain shell 4 is in threaded connection with the fastening shell 2. The installation shell 1 is in threaded connection with the fastening shell 2, and one end of the installation shell 1, which faces the fastening shell 2, is inserted into the metal protection pipe 3. The fastening housing 2 and the mounting housing 1 are both made of a metallic material.
The metal tubes 5 are arranged in the fastening shell 2, the fastening shell 2 and the metal tubes 5 in the fastening shell are fastened through the set screws 6, the optical fiber part of the optical cable 10 in the protective shell is exposed, and the exposed optical fiber part in the strain shell 4 is engraved with a grating to form an optical fiber grating region 11. The fiber grating region 11 is in the central region inside the strain housing 4. The metal tube 5 and the exposed optical fiber part are fixed by glue filling and sealing. The fiber grating region 11 is used for strain detection.
The mounting housing 1 is fixedly provided with a mounting seat. The mounting seat comprises a lower base 13 and an upper base 12 which are detachably and fixedly connected, and the mounting shell 1 is positioned between the upper base 12 and the lower base 13.
The compaction sleeve comprises an FC stop shell 7, an FC compression sleeve 8 is sleeved outside the FC stop shell 7, a tail sleeve 9 is sleeved outside the FC compression sleeve 8, one end of the installation shell 1 is in threaded connection with the FC stop shell 7, and the FC stop shell 7 and the FC compression sleeve 8 are compacted and fixed on an optical cable 10. The tail sleeve 9 is made of engineering plastics, and the tail sleeve 9 is in sealing clamping connection with the FC stop shell 7. The tail sleeve 9 can be used for performing waterproof and dampproof protection on the compression sleeve.
When the sensor is manufactured, a grating is engraved on the exposed optical fiber part of the optical cable 10 and an optical fiber grating region 11 is formed. The fiber grating region 11 is positioned in the central area inside the strain shell 4, and the metal tube 5 and the exposed optical fiber part inside the metal tube are fixed by glue filling and sealing. So that the metal tube 5 is fastened in the fastening housing 2 by means of the set screw 6. So that the fastening housing 2, the strain housing 4 are mechanically protected by the metal protection pipe 3. So that the fastening housing 2 is screwed with the mounting housing 1. The mounting housing 1 is then screwed to the FC stop housing 7 of the compression set, and when the mounting housing 1 is screwed to the FC stop housing 7 of the compression set, a thread compound is applied to the threaded connection pair therebetween. The optical cable 10 is then crimped onto the crimp sleeve, and finally the tail sleeve 9 is sleeved on the outer side of the crimp sleeve.
The strain shell 4 of the utility model adopts elastic metal material, and has the advantage of high detection precision. The optical cable 10 and the compression sleeve member are subjected to anti-pulling treatment through a compression process, and compared with the conventional adhesive bonding, the anti-pulling force of the sensor is improved, and the environmental resistance of the sensor in a severe environment is improved. And the integrated packaging is adopted, so that the structural reliability of the product is improved, the damage of the external environment to the sensor is reduced, and the service life is prolonged.
In the description of the present utility model, it should be understood that the terms "radial," "one end," "center," "outer," "upper," "one side," "inner," "two ends," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (10)
1. The utility model provides a tensile surface mounting type fiber bragg grating strain sensor, includes the protective housing, and fixedly connected with installation casing (1) all can be dismantled at the both ends of protective housing, all can dismantle fixedly connected with on installation casing (1) and compress tightly the external member, and optical cable (10) run through the protective housing, installation casing (1) and compress tightly the external member, and compress tightly external member and compress tightly optical cable (10), its characterized in that, protective housing outside cover are equipped with metal protection tube (3), the protective housing includes strain shell (4), and all can dismantle fixedly connected with fastening housing (2) at the both ends of strain shell (4), all installs metal tube (5) in fastening housing (2), and fastening housing (2) are with its inside metal tube (5) through holding screw (6) fastening, and the optical fiber part of optical cable (10) in the protective housing is naked, and is carved with the grating and forms fiber bragg grating district (11) on the naked optical fiber part in strain shell (4), is fixed with the mount pad on installation casing (1).
2. The tensile surface-mounted fiber bragg grating strain sensor according to claim 1, wherein the mounting shell (1) is in threaded connection with the fastening shell (2), and one end of the mounting shell (1) facing the fastening shell (2) is inserted into the metal protection tube (3).
3. The tensile surface-mounted fiber bragg grating strain sensor according to claim 1, wherein the compression sleeve comprises an FC stop housing (7), an FC compression sleeve (8) is sleeved outside the FC stop housing (7), a tail sleeve (9) is sleeved outside the FC compression sleeve (8), one end of the installation housing (1) is in threaded connection with the FC stop housing (7), and the FC stop housing (7) and the FC compression sleeve (8) are compressed and fixed on the optical cable (10).
4. A tensile surface mounted fiber grating strain sensor according to claim 1, characterized in that the strain housing (4) is screwed with the fastening housing (2).
5. A tensile surface mounted fiber grating strain sensor according to claim 1, characterized in that the strain housing (4) is a spring-like structure made of a resilient metallic material.
6. A tensile surface mounted fiber bragg grating strain sensor according to claim 1, wherein the metal tube (5) and the exposed fiber section therein are fixed by glue potting.
7. A tensile surface mounted fiber optic grating strain sensor according to claim 1, wherein the fiber optic grating region (11) is located in a central region inside the strain housing (4).
8. A tensile surface mounted fiber bragg grating strain sensor according to claim 1, characterized in that the fastening housing (2) and the mounting housing (1) are both made of a metallic material.
9. A tensile surface mounted fiber bragg grating strain sensor according to claim 3, characterized in that the tail sleeve (9) is made of engineering plastic, and the tail sleeve (9) is in sealing clamping connection with the FC stop housing (7).
10. The tensile surface-mounted fiber bragg grating strain sensor according to claim 1, wherein the mounting base comprises a lower base (13) and an upper base (12) which are detachably and fixedly connected, and the mounting shell (1) is positioned between the upper base (12) and the lower base (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321197569.2U CN219829781U (en) | 2023-05-18 | 2023-05-18 | Tensile surface-mounted fiber bragg grating strain sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321197569.2U CN219829781U (en) | 2023-05-18 | 2023-05-18 | Tensile surface-mounted fiber bragg grating strain sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219829781U true CN219829781U (en) | 2023-10-13 |
Family
ID=88283827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321197569.2U Active CN219829781U (en) | 2023-05-18 | 2023-05-18 | Tensile surface-mounted fiber bragg grating strain sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219829781U (en) |
-
2023
- 2023-05-18 CN CN202321197569.2U patent/CN219829781U/en active Active
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