CN210051341U

CN210051341U - Intelligent identification label and monument based on fiber grating sensing

Info

Publication number: CN210051341U
Application number: CN201920915310.4U
Authority: CN
Inventors: 童杏林; 李雪; 熊家国; 张翠; 邓承伟; 许欧阳
Original assignee: Wuhan University of Technology WUT
Current assignee: Wuhan University of Technology WUT
Priority date: 2019-06-18
Filing date: 2019-06-18
Publication date: 2020-02-11
Anticipated expiration: 2029-06-18

Abstract

The utility model relates to the technical field of optical fiber sensing, in particular to an intelligent identification label and a monument based on optical fiber grating sensing; the composite shell is implanted into a marking label or a monument, a sensing optical fiber is arranged in the composite shell, and a strain sensor and a temperature sensor are arranged at the access end of the sensing optical fiber; an FBG vibration sensor or a Fabry-Perot resonant cavity vibration sensor is arranged in the composite shell; the utility model applies the fiber grating sensing array to the identification label and the monument, can detect the change of various parameters of temperature and stress simultaneously by adopting a time-division demodulation mode, and monitors the surrounding environment information of the intelligent identification label and the monument in real time; the method can identify and analyze various implementation conditions of the position, illegal damage, movement and peripheral illegal operation of the identification label and the monument, and has the characteristics of high positioning precision, quick response, electromagnetic interference resistance, corrosion resistance, high temperature resistance, intrinsic explosion resistance and the like.

Description

Intelligent identification label and monument based on fiber grating sensing

Technical Field

The utility model relates to an optical fiber sensing technical field specifically indicates an intelligence sign and boundary stone tablet based on fiber grating sensing.

Background

At present, most of identification labels and monuments are made of materials such as stone, wood, cement and the like, and only have the functions of identification and warning. For example, a signboard indicating that an underground optical cable is buried only has a warning function, and illegal construction and damage affecting the underground optical cable cannot be detected. The optical fiber sensing technology has the advantages of high sensitivity, electromagnetic interference resistance, intrinsic safety, long-term stable work in a severe environment and the like, and along with the development of the optical fiber sensing technology, the optical fiber grating is prominent in various sensors by virtue of the advantages of low loss, good spectral characteristics, high reliability and the like. Fiber grating sensing technology is well suited as a distributed element that is embedded in a material or otherwise attached to an internal surface to allow for temperature and strain sensing. The fiber grating sensing technology is applied to the identification plate and the monument, the environment around the identification plate and the monument can be detected in real time, the long-term safe operation of the national defense identification plate and the monument is guaranteed, the economic value and the important social value are high, and the research result has a very wide application scene.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to prior art's defect and not enough, provide a rational in infrastructure, can carry out real-time detection's intelligent sign and monument based on fiber grating sensing to environment on every side.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model discloses an intelligent sign and boundary tablet based on fiber grating sensing, including compound casing, compound casing is planted in sign or boundary tablet, is equipped with sensing optical fiber in the compound casing, be equipped with strain and temperature sensor on sensing optical fiber's the incoming end; and an FBG vibration sensor or a Fabry-Perot resonant cavity vibration sensor is arranged in the composite shell.

According to the scheme, the FBG vibration sensor comprises a low-reflectivity Bragg grating which is inscribed on the sensing optical fiber, the two ends of the sensing optical fiber are fixedly connected with the composite shell, so that the sensing optical fiber is transversely suspended in the inner cavity of the composite shell, and the sensing optical fiber is provided with the mass block.

According to the scheme, two tension wheels are arranged in the composite shell, the two tension wheels are arranged in an upper inner cavity of the composite shell at intervals, and the middle part of the sensing optical fiber is wound on the two tension wheels; two fixed terminals are arranged in the inner cavity of the lower part of the composite shell and fixedly connected with two end parts of the sensing optical fiber; the mass block is adhered to the sensing optical fiber between the two tension wheels, and the low-reflectivity Bragg grating is inscribed on the sensing optical fiber between one tension wheel and the fixed terminal.

According to the scheme, the Fabry-Perot resonant cavity vibration sensor comprises two low-reflectivity chirped gratings which are inscribed on a sensing optical fiber, wherein the two low-reflectivity chirped gratings are arranged on the sensing optical fiber at intervals of a distance H; and the two low-reflectivity chirped gratings are respectively packaged on a low-position reference point and a high-position reference point of the composite shell.

According to the scheme, the vertical cylinder is arranged in the composite shell, the sensing optical fibers are wound on the cylinder in a spiral mode, and the sensing optical fibers at the two low-reflectivity chirped gratings are respectively fixed on the low-position reference point and the high-position reference point of the cylinder.

According to the scheme, the strain and temperature sensor is an F-P temperature and pressure sensor formed by writing paired Bragg gratings on sensing optical fibers.

According to the scheme, the optical fiber assembly is arranged in the composite shell and used for sequentially connecting the sensing optical fibers to form the fiber grating sensing array.

The utility model discloses beneficial effect does: the utility model applies the fiber grating sensing array to the identification label and the monument, can detect the change of various parameters of temperature and stress simultaneously by adopting a time-division demodulation mode, and monitors the surrounding environment information of the intelligent identification label and the monument in real time; the method can identify and analyze various implementation conditions of the position, illegal damage, movement and peripheral illegal operation of the identification label and the monument, and has the characteristics of high positioning precision, quick response, electromagnetic interference resistance, corrosion resistance, high temperature resistance, intrinsic explosion resistance and the like.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.

In the figure:

1. a composite housing; 2. a sensing optical fiber; 21. strain and temperature sensors; 22. an FBG vibration sensor; 23. a Fabry-Perot resonant cavity vibration sensor; 221. a low-reflectivity Bragg grating; 222. a mass block; 223. a fixed terminal; 224. a tension wheel; 231. a low-reflectivity chirped grating; 232. a column.

Detailed Description

The technical solution of the present invention will be described below with reference to the accompanying drawings and examples.

As shown in fig. 1-2, the intelligent identification plate and monument based on fiber grating sensing of the present invention includes a composite housing 1, wherein the composite housing 1 is embedded in the identification plate or monument, a sensing fiber 2 is disposed in the composite housing 1, and a strain and temperature sensor 21 is disposed on an access end of the sensing fiber 2; an FBG vibration sensor 22 or a Fabry-Perot resonant cavity vibration sensor 23 is arranged in the composite shell 1; the utility model is used for 2 butt fusion of sensing fiber in a plurality of intelligent sign signs and the monument of boundary constitute fiber grating sensing array, through signal demodulation appearance, the data processing unit, the backstage processing end that the computer is constituteed monitors intelligent sign signs and monument all ring edge border ring border environment, but the position of real-time supervision sign and monument of boundary, illegal harm, remove and the multiple situation of implementing of peripheral illegal operation, have positioning accuracy height, the response is fast, anti-electromagnetic interference, anticorrosive, high temperature resistant, characteristics such as intrinsic explosion-proof.

In embodiment 1, as shown in fig. 1, the FBG vibration sensor 22 includes a low-reflectivity bragg grating 221 inscribed on the sensing fiber 2, two ends of the sensing fiber 2 are fixedly connected with the composite housing 1, so that the sensing fiber 2 is transversely suspended in the inner cavity of the composite housing 1, and the sensing fiber 2 is provided with a mass block 222; the mass block 222 is used for sensing external vibration, and the vibration of the mass block 222 stretches the sensing optical fiber 2, so that the reflection wavelength of the low-reflectivity bragg grating 221 drifts, a monitoring point can be accurately positioned through a time division multiplexing technology, and variables of the surrounding environment are analyzed and judged through a background analysis program.

Two tension wheels 224 are arranged in the composite shell 1, the two tension wheels 224 are arranged in the upper inner cavity of the composite shell 1 at intervals, and the middle part of the sensing optical fiber 2 is wound on the two tension wheels 224; two fixed terminals 223 are arranged in the inner cavity of the lower part of the composite shell 1, and the two fixed terminals 223 are fixedly connected with two end parts of the sensing optical fiber 2; the mass block 222 is adhered to the sensing optical fiber 2 between the two tension wheels 224, and the low-reflectivity bragg grating 221 is inscribed on the sensing optical fiber 2 between one tension wheel 224 and the fixed terminal 223; the sensing optical fiber 2 between the tension wheels 224 has an extension amount within a calibration value range, when the composite shell 1 is vibrated externally, the mass block 222 generates vertical vibration to stretch the sensing optical fiber 2, the reflection wavelength of the low-reflectivity Bragg grating 221 drifts, and then the monitoring point can be accurately positioned through a time division multiplexing technology.

Embodiment 2, as shown in fig. 2, the fabry-perot resonator vibration sensor 23 includes two low-reflectivity chirped gratings 231 inscribed on the sensing fiber 2, wherein the two low-reflectivity chirped gratings 231 are spaced apart by a distance H on the sensing fiber 2; the two low-reflectivity chirped gratings 231 are respectively encapsulated on a low reference point and a high reference point of the composite shell 1; the two chirped gratings 231 with low reflectivity form a fabry-perot (F-P) cavity, and since the medium in the interference cavity is an optical fiber, the loss of light reflected back and forth in the cavity is very small, so the cavity length can be very long, and the H range in this embodiment is 1-2 m. The 3dB bandwidth of the central wavelength of the low-reflectivity chirped grating 231 is greater than 0.2nm, the reflection spectrum of the Fabry-Perot (F-P) resonant cavity formed by the low-reflectivity chirped grating 231 is more obvious than that of the low-reflectivity FBG vibration sensor 22, the sensitivity to the surrounding environment is higher, and the illegal construction conditions around can be sensed more accurately.

A vertical cylinder 232 is arranged in the composite shell 1, the sensing optical fiber 2 is spirally wound on the cylinder 232, and the sensing optical fibers 2 at the two low-reflectivity chirped gratings 231 are respectively fixed on a low-position reference point and a high-position reference point of the cylinder 232; the sensing fiber 2 is wound in a spiral manner to ensure the distance H between the two low-reflectivity chirped gratings 231 thereon, the reflectivity range of the low-reflectivity chirped gratings 231 can be between-40 dB and-20 dB according to the requirement, the wavelength of the FBG can be the same wavelength or different wavelengths, and the central wavelength of the FBG can drift under the influence of the change of parameters such as external strain and the like; the two low-reflectivity chirped gratings 231 are respectively a reference grating at the top and a sensing grating at the bottom, and the low-reflectivity chirped gratings 231 are specially packaged to be fixed without being under the action of stress; the reference grating obtains temperature characteristics through calibration, influences of temperature can be eliminated from wavelength drift of the sensing grating according to a temperature characteristic curve of the sensing grating, strain is demodulated, and illegal movement and damage of the intelligent identification label and the monument are sensed.

The strain and temperature sensor 21 is an F-P temperature and pressure sensor formed by writing paired Bragg gratings on the sensing optical fiber 2, and the strain and temperature sensor 21 is used for signal compensation of the vibration sensor.

Be equipped with fiber assembly in the compound casing 1, fiber assembly is used for connecting gradually a plurality of sensing optic fibre and constitutes fiber grating sensing array, the utility model discloses a fiber assembly constitutes fiber grating sensing array with the 2 butt fusion of sensing optic fibre in a plurality of intelligent sign signs and the monument, through signal demodulation appearance, data processing unit, the backstage processing end that the computer is constituteed is monitored intelligent sign and monument border ring border environment, but the position of real-time supervision sign and monument, illegal harm, remove and the multiple situation of implementing of peripheral illegal operation, have positioning accuracy height, the response is fast, anti-electromagnetic interference, anticorrosive, high temperature resistant, characteristics such as intrinsic explosion-proof.

The above is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles in accordance with the claims of the present invention are included in the claims of the present invention.

Claims

1. The utility model provides an intelligence sign and monument based on fiber grating sensing, includes compound casing (1), its characterized in that: the composite shell (1) is implanted into a marking label or a monument, a sensing optical fiber (2) is arranged in the composite shell (1), and a strain and temperature sensor (21) is arranged at the access end of the sensing optical fiber (2); an FBG vibration sensor (22) or a Fabry-Perot resonant cavity vibration sensor (23) is arranged in the composite shell (1).

2. The fiber grating sensing-based intelligent identification sign and monument of claim 1, wherein: FBG vibration sensor (22) is including carving on low reflectivity Bragg grating (221) on sensing fiber (2), the both ends and compound casing (1) fixed connection of sensing fiber (2) and then make sensing fiber (2) transversely unsettled set up in the inner chamber of compound casing (1), and be equipped with quality piece (222) on sensing fiber (2).

3. The fiber grating sensing-based intelligent identification sign and monument of claim 2, wherein: two tension wheels (224) are arranged in the composite shell (1), the two tension wheels (224) are arranged in an upper inner cavity of the composite shell (1) at intervals, and the middle part of the sensing optical fiber (2) is wound on the two tension wheels (224); two fixed terminals (223) are arranged in an inner cavity at the lower part of the composite shell (1), and the two fixed terminals (223) are fixedly connected with two end parts of the sensing optical fiber (2); the mass block (222) is adhered to the sensing optical fiber (2) between the two tension wheels (224), and the low-reflectivity Bragg grating (221) is inscribed on the sensing optical fiber (2) between one tension wheel (224) and the fixed terminal (223).

4. The fiber grating sensing-based intelligent identification sign and monument of claim 1, wherein: the Fabry-Perot resonant cavity vibration sensor (23) comprises two low-reflectivity chirped gratings (231) which are inscribed on a sensing optical fiber (2), wherein the two low-reflectivity chirped gratings (231) are arranged on the sensing optical fiber (2) at intervals of a distance H; the two low-reflectivity chirped gratings (231) are respectively packaged on a low-position reference point and a high-position reference point of the composite shell (1).

5. The fiber grating sensing-based intelligent identification sign and monument of claim 4, wherein: a vertical cylinder (232) is arranged in the composite shell (1), the sensing optical fibers (2) are wound on the cylinder (232) in a spiral mode, and the sensing optical fibers (2) at the two low-reflectivity chirped gratings (231) are respectively fixed on a low-position reference point and a high-position reference point of the cylinder (232).

6. The fiber grating sensing-based intelligent identification sign and monument of claim 1, wherein: the strain and temperature sensor (21) is an F-P temperature and pressure sensor formed by writing paired Bragg gratings on the sensing optical fiber (2).

7. The intelligent identification tag and monument based on fiber grating sensing of any one of claims 1-6, wherein: and an optical fiber assembly is arranged in the composite shell (1), and the optical fiber assembly is used for sequentially connecting a plurality of sensing optical fibers to form an optical fiber grating sensing array.