CN211147591U - Mileage calibration device for distributed optical fiber strain sensing system - Google Patents
Mileage calibration device for distributed optical fiber strain sensing system Download PDFInfo
- Publication number
- CN211147591U CN211147591U CN201922405703.3U CN201922405703U CN211147591U CN 211147591 U CN211147591 U CN 211147591U CN 201922405703 U CN201922405703 U CN 201922405703U CN 211147591 U CN211147591 U CN 211147591U
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- distributed optical
- mileage
- sensor
- fiber strain
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a distributed optical fiber strain sensing system mileage calibration device, including distributed optical fiber brillouin demodulation appearance, distributed optical fiber strain sensor, connecting optical fiber, stress loading device, the GPS locater, sensor mileage calibration point and strain mileage calibration module, characterized by is in distributed optical fiber strain sensing system, stress loading device applys the load to selected sensor mileage calibration point, GPS locater and distributed optical fiber brillouin demodulation appearance are fixed a position and are established this position punishment distributed optical fiber strain sensor's of position department mileage position and light path position one-to-one relation to the mileage position and the light path position of distributed optical fiber strain sensor respectively. The utility model is suitable for a monitoring information's such as oil gas pipeline, high-speed railway road bed and highway road bed isometric distance structure mileage is markd, marks through the mileage, can fix a position the mileage position of structure damage fast.
Description
Technical Field
The invention belongs to the field of distributed optical fiber sensing monitoring, and particularly relates to a mileage calibration device of a distributed optical fiber strain sensing system, which can realize one-to-one correspondence between optical path positions of sensors and actual physical positions.
Background
The distributed optical fiber strain sensing technology adopts common optical fibers as sensing and data transmission units, can realize continuous strain field on-line monitoring of dozens of kilometers or even hundreds of kilometers, and is widely applied to deformation monitoring of long-distance structures such as roads, railways and pipelines. The basic principle of the distributed optical fiber sensing technology is that light propagates in an optical fiber and inelastically collides with irregular particles in the optical fiber to generate Brillouin light scattering, and the frequency difference between incident light and the Brillouin scattering light is Brillouin frequency shift. When the optical fiber is subjected to external stress or temperature change, the refractive index of the optical fiber is changed by the thermo-optic effect and the elasto-optic effect in the optical fiber, and further the Brillouin scattering frequency shift is changed. The theoretical and experimental calibration results show that the Brillouin scattering frequency shift has a linear relationship with the temperature and stress of the optical fiber. The measurement of the corresponding temperature and strain fields can be achieved by demodulating or measuring the brillouin shift in the fibre.
The strain positioning method of the distributed optical fiber strain sensor is based on an optical time domain reflection technology, namely, the strain position of each measuring point can be positioned with high precision by recording the emitting time of detection laser, the receiving time of Brillouin backward scattering light and the propagation speed of light in optical fiber. It can be seen that the strain position located based on the optical time domain reflectometry technique is the position of the sensor in the whole optical path, i.e. the brillouin scattering reflection point position. For an actual distributed optical fiber strain sensing system, the sensors need to be optimally arranged according to conditions such as field construction environment of a monitored object, height and displacement of terrain, and the like, the sensors cannot be continuously and linearly arranged, and each distributed sensor also needs additional transmission optical cables for connection, so that the length of a sensor arrangement line is preset to be different from the actual length of the sensor arrangement line, namely the position of the sensor in a system light path is different from the mileage of an actual monitoring position. For long-distance linear projects such as long-distance buried pipelines and roadbeds, the strain monitoring information of the distributed optical fiber strain sensor is required to accurately acquire the position of a mileage where damage occurs rather than the position of a light path corresponding to the damage. If the damaged mileage position can be accurately positioned, the damage repair and the safety early warning can be greatly facilitated.
Disclosure of Invention
The invention aims to solve the problem of mileage position positioning of a distributed optical fiber strain sensing monitoring system on a strain measurement value, and provides a distributed optical fiber strain sensing system mileage calibration device capable of realizing one-to-one correspondence between a sensor optical path position and an actually measured mileage position.
The technical scheme of the invention is as follows: a distributed optical fiber strain sensing system mileage calibration device comprises a distributed optical fiber Brillouin demodulator 1, a distributed optical fiber strain sensor 2, a connecting optical fiber 3, a stress loading device 4, a GPS locator 5, a sensor mileage calibration point 6 and a strain mileage calibration module 7, the distributed optical fiber Brillouin strain sensing system is characterized in that the distributed strain sensors 2 are continuously distributed in the structure through the connecting optical fibers 3 and are connected with the distributed optical fiber Brillouin demodulator 1 through the connecting optical fibers 3 to form the distributed optical fiber strain sensing system, the GPS positioning instrument 5 positions coordinates of the selected sensor mileage calibration point 6, stress is applied to the sensor mileage calibration point 6 through the stress loading device 4, and the distributed optical fiber Brillouin demodulator 1 collects strain information of the distributed optical fiber strain sensors 2 at the sensor mileage calibration point 6 and records corresponding optical path position information (namely position information displayed on the distributed optical fiber Brillouin demodulator 1). The strain mileage calibration module 7 receives the position coordinates of the sensor mileage calibration point 6 of the GPS positioning instrument 5 and the light path position information of the sensor mileage calibration point 6, which is acquired by the distributed fiber brillouin demodulator 1 at the corresponding position, and establishes a one-to-one correspondence relationship between the GPS coordinate values and the corresponding light path positions at the position of the sensor mileage calibration point 6.
The distributed optical fiber strain sensor 2 is continuously distributed in the structure through the connecting optical fiber 3 and is connected with the distributed optical fiber Brillouin demodulator 1 through the connecting optical fiber 3 to form a distributed optical fiber strain sensing system.
The GPS locator 5 performs coordinate recognition on the selected sensor mileage calibration point 6.
The sensor mileage calibration point 6 selects the position of a hot spot where damage and disaster easily occur to the structure, the connection point of the distributed optical fiber strain sensor 2 and the connection optical fiber 3, and the like.
At the selected sensor mileage calibration point 6, the stress loading device 4 is fixed on the distributed optical fiber strain sensor 2 and applies a certain stress on the sensor mileage calibration point 6, and the distributed optical fiber Brillouin demodulator 1 acquires corresponding strain information and records the position of an optical path.
The stress loading device 4 consists of two clamping anchor heads 4-1 with the same diameter as the distributed optical fiber strain sensor 2, a door-shaped frame 4-2 and a stress application push rod 4-3.
The optical path position refers to the position of the Brillouin reflection point of light in the optical fiber.
The strain mileage calibration module 7 receives the positioning information of the selected sensor mileage calibration point 6 by the GPS positioning instrument 5 and the optical path position of the sensor mileage calibration point 6 acquired by the distributed fiber brillouin demodulator 1 at the same time, and establishes a one-to-one correspondence relationship between the optical path position of the sensor mileage calibration point 6 and the actual mileage position.
The method has the advantages that the relation between the light path position of the distributed optical fiber strain sensor 2 in the distributed optical fiber strain sensing system and the actual mileage position can be quickly established according to the GPS locator 5 and the stress loading device 4, the actual distance position of each distributed optical fiber strain sensor 2 can be accurately positioned on the structure analysis software, the maintenance personnel can conveniently and quickly position the structure damage position, and the structure damage maintenance time and cost are improved.
Drawings
FIG. 1 is a schematic diagram of a distributed optical fiber strain sensing system mileage calibration device according to the present invention;
In the figure: a distributed optical fiber Brillouin demodulator 1; a distributed optical fiber strain sensor 2; a connecting optical fiber 3; a stress loading device 4; a GPS locator 5; a sensor mileage calibration point 6; and a strain mileage calibration module 7.
FIG. 2 is a schematic structural diagram of the stress loading device 4
In the figure: clamping an anchor head 4-1; a gate frame 4-2; and a stress application push rod 4-3.
Detailed Description
The following detailed description of the invention refers to the accompanying drawings.
Fig. 1 is a schematic diagram of a distributed optical fiber strain sensing system mileage calibration device according to the present invention. The distributed optical fiber strain sensor 2 is continuously distributed in a structure to be monitored through a connecting optical fiber 3, and is connected with a distributed optical fiber Brillouin demodulator 1 through the connecting optical fiber 3 to form a distributed optical fiber strain sensing system. The damage position of the selected structure is a sensor mileage calibration point 6, the stress loading device 4 is installed on the distributed optical fiber strain sensor 2 corresponding to the sensor mileage calibration point 6, a load is applied to the distributed optical fiber strain sensor 2 through a stress application push rod 4-3, meanwhile, the distributed optical fiber Brillouin demodulator 1 demodulates and positions the strain on the distributed optical fiber strain sensor 2, and the position where the distributed optical fiber Brillouin demodulator 1 is positioned is the optical path position of the sensor mileage calibration point 6. The GPS locator 5 locates the sensor mileage calibration point 6, and the locating information is the mileage position of the sensor mileage calibration point 6. The light path position positioned by the distributed optical fiber Brillouin demodulator 1 and the mileage position positioned by the GPS locator 5 are transmitted into the strain mileage calibration module 7, and the one-to-one corresponding relation between the light path position of the sensor mileage calibration point 6 and the mileage position is established. In specific implementation, a plurality of sensor mileage calibration points 6 can be selected in the optical path of the distributed optical fiber strain sensing system, and corresponding mileage calibration is performed respectively.
Fig. 2 is a schematic structural diagram of the stress loading device 4. The specific implementation mode is that the clamping anchor head 4-1 is used for fixing the stress loading device 4 on the distributed optical fiber strain sensor 2, and the stress application push rod 4-3 is used for applying load to the distributed optical fiber strain sensor 2 at the clamping position.
The above-mentioned embodiments only express the embodiments of the present invention, but not should be understood as the limitation of the scope of the invention patent, it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the concept of the present invention, and these all fall into the protection scope of the present invention.
Claims (6)
1. A distributed optical fiber strain sensing system mileage calibration device comprises a distributed optical fiber Brillouin demodulator (1), a distributed optical fiber strain sensor (2), a connecting optical fiber (3), a stress loading device (4), a GPS (global positioning system) locator (5), a sensor mileage calibration point (6) and a strain mileage calibration module (7); the method is characterized in that:
The distributed optical fiber strain sensor (2) is continuously arranged in a structure to be monitored through the connecting optical fiber (3) and is connected with the distributed optical fiber Brillouin demodulator (1) through the connecting optical fiber (3) to form a distributed optical fiber strain sensing system, the GPS locator (5) and the distributed optical fiber Brillouin demodulator (1) are used for carrying out mileage positioning and light path positioning on the sensor mileage calibration point (6) respectively, positioning information is transmitted into the strain mileage calibration module (7) and the one-to-one corresponding relation between the mileage position and the light path position of the distributed optical fiber strain sensor (2) at the position of the sensor mileage calibration point (6) is established.
2. The distributed optical fiber strain sensing system mileage calibration device according to claim 1, characterized in that the sensor mileage calibration point (6) is a position where the structure is vulnerable and a disaster is likely to occur in the distributed optical fiber strain sensing system, and the stress loading device (4) is fixed on the distributed optical fiber strain sensor (2) at the sensor mileage calibration point (6) and applies a load to the distributed optical fiber strain sensor (2).
3. The distributed optical fiber strain sensing system mileage calibration device according to claim 1 or 2, characterized in that the stress loading device (4) comprises two clamping anchor heads (4-1) with the same diameter as the distributed optical fiber strain sensor (2), a door-shaped frame (4-2) and a stress applying push rod (4-3), wherein the clamping anchor heads (4-1) fix the stress loading device (4) on the distributed optical fiber strain sensor (2), and the stress applying push rod (4-3) applies load to the distributed optical fiber strain sensor (2).
4. The distributed optical fiber strain sensing system mileage calibration apparatus according to claim 1 or 2, wherein the GPS locator (5) locates the mileage position of the sensor mileage calibration point (6) and transmits the mileage position to the strain mileage calibration module (7).
5. The distributed optical fiber strain sensing system mileage calibration apparatus according to claim 3, characterized in that the distributed optical fiber Brillouin demodulator (1) demodulates the strain of the distributed optical fiber strain sensor (2) at the sensor mileage calibration point (6) and records the corresponding optical path position, and transmits the optical path position to the strain mileage calibration module (7).
6. The distributed optical fiber strain sensing system mileage calibration device according to claim 5, characterized in that the strain mileage calibration module (7) establishes a one-to-one correspondence relationship between mileage positions and light path positions of the distributed optical fiber strain sensors (2) at the sensor mileage calibration points (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922405703.3U CN211147591U (en) | 2019-12-28 | 2019-12-28 | Mileage calibration device for distributed optical fiber strain sensing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922405703.3U CN211147591U (en) | 2019-12-28 | 2019-12-28 | Mileage calibration device for distributed optical fiber strain sensing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211147591U true CN211147591U (en) | 2020-07-31 |
Family
ID=71756208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922405703.3U Active CN211147591U (en) | 2019-12-28 | 2019-12-28 | Mileage calibration device for distributed optical fiber strain sensing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211147591U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114279420A (en) * | 2021-12-22 | 2022-04-05 | 湖北三江航天红峰控制有限公司 | Three-dimensional space position continuous change combined measuring device and measuring method |
| CN116380417A (en) * | 2023-04-18 | 2023-07-04 | 中国长江三峡集团有限公司 | Parameter calibration device and method for wind turbine generator blade distributed optical fiber monitoring system |
-
2019
- 2019-12-28 CN CN201922405703.3U patent/CN211147591U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114279420A (en) * | 2021-12-22 | 2022-04-05 | 湖北三江航天红峰控制有限公司 | Three-dimensional space position continuous change combined measuring device and measuring method |
| CN114279420B (en) * | 2021-12-22 | 2023-08-04 | 湖北三江航天红峰控制有限公司 | Three-dimensional space position continuous change combined measurement device and measurement method |
| CN116380417A (en) * | 2023-04-18 | 2023-07-04 | 中国长江三峡集团有限公司 | Parameter calibration device and method for wind turbine generator blade distributed optical fiber monitoring system |
| CN116380417B (en) * | 2023-04-18 | 2024-03-08 | 中国长江三峡集团有限公司 | Parameter calibration device and method for wind turbine generator blade distributed optical fiber monitoring system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Du et al. | A review of railway infrastructure monitoring using fiber optic sensors | |
| Mohamad et al. | Behaviour of an old masonry tunnel due to tunnelling-induced ground settlement | |
| CN101592475B (en) | Fully distributed fiber Rayleigh and Raman scattering photon strain and temperature sensor | |
| Sasi et al. | A review on structural health monitoring of railroad track structures using fiber optic sensors | |
| CN211147591U (en) | Mileage calibration device for distributed optical fiber strain sensing system | |
| CN108279037A (en) | A kind of method for arranging of underground railway track structure real-time monitoring system | |
| US10907958B2 (en) | Railroad track defect detection apparatus and method | |
| CN101397021A (en) | Vehicle running monitoring system based on optical fibre grating | |
| Zhang et al. | Multi-scale load identification system based on distributed optical fiber and local FBG-based vibration sensors | |
| Mustafa et al. | Identification of external load information using distributed optical fiber sensors embedded in an existing road pavement | |
| CN101324446B (en) | Destabilization sensing localization method | |
| Minardo et al. | Distributed optical fiber sensors for integrated monitoring of railway infrastructures | |
| CN103822646A (en) | Method for demodulating long distance light delayed effect in fiber bragg grating demodulation system | |
| CN210862556U (en) | Bridge dynamic deflection monitoring system based on distributed optical fibers | |
| CN107829355A (en) | A kind of device and method of polymer optical fiber monitoring crack on road | |
| Diouf et al. | Study of a space-time monitoring of high-speed railway underline structure using distributed optical vibration sensing technology | |
| CN201417140Y (en) | Distributed optical-fiber Rayleigh/Raman-scattering-photon strain/temperature sensor | |
| Li et al. | Distributed optical fiber bi-directional strain sensor for gas trunk pipelines | |
| CN208138881U (en) | A kind of early warning system being used for underground piping based on BOTDR | |
| US11733070B2 (en) | Street light operating status monitoring using distributed optical fiber sensing | |
| JP3519587B2 (en) | Inner air section measurement device | |
| Wu et al. | Development and performance evaluation of non-slippage optical fiber as Brillouin scattering-based distributed sensors | |
| CN211926782U (en) | Underground pipeline monitoring system based on distributed optical fiber sensing | |
| Wang et al. | The Long-Term Settlement Deformation Automatic Monitoring System for the Chinese High-Speed Railway. | |
| Wosniok et al. | Static load monitoring of a concrete bridge using a high-precision distributed fiber optic sensor system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |