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Multi-core fiber bragg grating (FBG) universal bending sensor

A multi-core fiber, universal bending technology, applied in instruments, optical devices, measuring devices, etc., can solve the problems of increasing the number of sensors, increasing the number of sensors, and unable to fully compensate for the influence of temperature.

Inactive Publication Date: 2017-07-18
HARBIN ENG UNIV
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Problems solved by technology

[0002] The main problems of using fiber grating technology for angle and bending sensing are as follows: 1. A fiber grating sensor can usually only detect angle changes in one or two directions. If the dimension of sensing information is increased, it must be correspondingly Increase the number of sensors
2. The problem of temperature cross-talk cannot be completely solved
However, this method cannot fully compensate the influence of temperature, and doubles the number of sensors, increasing the system cost

Method used

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  • Multi-core fiber bragg grating (FBG) universal bending sensor
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  • Multi-core fiber bragg grating (FBG) universal bending sensor

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] The invention uses multi-core fiber gratings with different reflection wavelengths for universal bending sensing, which not only solves the disadvantages of the previous fiber grating bending sensing that can only detect one to two angle changes, poor stability, and temperature crosstalk, but also has a probe Small size, strong anti-interference ability, light weight, built-in temperature compensation and other advantages.

[0023] The fiber grating made of multi-core optical fiber can constitute the most compact gimbal bending sensor. Different from the technology reported in the recent literature, this project intends to use multi-core optical fibers with slightly different core refractive indices to produce the same periodic structure of fiber gratings, and then write multiple groups of different reflection wavelengths along the same multi-core optical fiber....

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Abstract

The invention belongs to the fiber sensing technical field, and specifically relates to a multi-core fiber bragg grating (FBG) universal bending sensor; the multi-core fiber bragg grating (FBG) universal bending sensor is suitable for smart material and structure on-line detection and analysis, can control and monitor space structure space three dimensional positions and attitudes, and is formed by using the multi-core fiber bragg grating (FBG) as the basic sensing unit; the multi-core fiber bragg grating (FBG) universal bending sensor comprises multi-core fibers including one center fiber core, and the resting fiber cores are arranged around the center fiber core in quadrature distribution or symmetrical distribution; each fiber core in the same transverse position of the multi-core fiber uses the same phase mask slice to simultaneously expose the FBG; the central wavelengths of various Bragg gratings on the multi-core fiber are different; the multi-core fiber bragg grating (FBG) universal bending sensor can monitor various reflection wavelength changes of the multi-core FBG, thus measuring the bending amplitude and direction angles.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and specifically relates to a multi-core optical fiber grating as a basic sensor that can be used for online detection and analysis of intelligent materials and structures, and can also be used for monitoring and controlling the three-dimensional position and attitude of space structures. A multi-core fiber grating gimbal bending sensor composed of units. Background technique [0002] The main problems of using fiber grating technology for angle and bending sensing are as follows: 1. A fiber grating sensor can usually only detect angle changes in one or two directions. If the dimension of sensing information is increased, it must be correspondingly Increase the number of sensors. 2. The problem of temperature cross-talk cannot be completely solved yet. At present, the method to reduce temperature crosstalk is to use two sensors with close distances to detect simultaneously, and us...

Claims

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Application Information

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IPC IPC(8): G01B11/16
CPCG01B11/165
Inventor 苑立波赵雨佳
Owner HARBIN ENG UNIV
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