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A Fiber Distributed Sensing System with U-shaped Sensing Fiber Deployment Structure

A technology of optical fiber distribution and sensing optical fiber, which is applied in the field of optical fiber optics, information acquisition and perception, and optical engineering. It can solve the problem of the minimum integration time limiting the spatial resolution, etc., and achieve the effect of high-resolution positioning and speed measurement

Active Publication Date: 2018-08-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pulse width of the incident laser and the minimum integration time of the photodetector greatly limit the spatial resolution of this type of system.

Method used

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  • A Fiber Distributed Sensing System with U-shaped Sensing Fiber Deployment Structure
  • A Fiber Distributed Sensing System with U-shaped Sensing Fiber Deployment Structure
  • A Fiber Distributed Sensing System with U-shaped Sensing Fiber Deployment Structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Optical fiber distributed sensing system based on single U-shaped optical fiber distribution structure

[0029] figure 1Demonstrated an optical fiber distributed sensing system based on a single U-shaped sensing optical fiber distribution structure, a single U-shaped optical fiber F1 is buried shallowly in the soil below the surface along the track, parallel to the train track and kept 20cm to the train track The linear distance of 30cm ensures that the sensing fiber maintains high sensitivity to vibration. The vibration signal (Z) generated by the movement of the locomotive on the track will act indirectly on the sensing fiber to change the transmission and scattering characteristics of the sensing fiber. According to the pulse width (T) of the pulsed laser used in the system, the sensing fiber is sequentially divided into continuous channels (C1, C2, C3...C34) with a length of (T / 2) from the laser incident end, and the incident pulsed laser A0, A1 passes through the...

Embodiment 2

[0042] Optical Fiber Distributed Sensing System Based on 3U Optical Fiber Distribution Structure

[0043] Such as Figure 5 As shown, on the basis of the above-mentioned single U interleaved distribution structure, a 3U optical fiber distribution structure can be further adopted, in which the corresponding channels have a dislocation of 1 / 4 channel length. 5-A is the vibration signal (Z) waveform generated by the wheel during motion, and 5-B is the backscattered light signal sampled by channels C55, C56, C57, C58, C59, and C60 when the light pulse is transmitted in the optical fiber Waveform, 5-C is the backscattered light signal waveform sampled by channels C49, C48, C47, C46, ​​C45, and C44 when the optical pulse is transmitted in the optical fiber, 5-D is the channel C21 when the optical pulse is transmitted in the optical fiber , C22, C23, C24, and C25 sampled backscattered light signal waveforms, 5-E is the backscattered light signal waveform sampled by channels C13, C12...

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Abstract

The invention relates to the technical fields of optical engineering, optical fiber optics, and information acquisition and perception, in particular to an optical fiber distributed sensing system with a U-shaped sensing optical fiber deployment structure. In the present invention, the sensing optical fiber used for detecting vibration signals in the optical fiber distributed sensing system is arranged into a multi-U-shaped structure, and the multi-U-shaped structure consists of N parallel sides to form N-1 U-shaped, and the adjacent U-shaped directions On the contrary, N>1. From the beginning of the sensing fiber, it is divided into a series of continuous and equal-length channels, and the length of each channel is half of the line width T of the incident pulsed laser. Each channel on each parallel side of the sensing fiber does not overlap with a channel corresponding to an adjacent parallel side in a direction perpendicular to the parallel side. The invention improves the spatial resolution of the system on the basis of not reducing the pulse width of the light source, not sacrificing the incident power of the light source, and not reducing the minimum integration time of the photodetector.

Description

technical field [0001] The invention relates to the technical fields of optical engineering, optical fiber optics, and information acquisition and perception, in particular to optical fiber sensing and signal processing technologies. Background technique [0002] With the rapid development of rail transit such as high-speed railways and urban subways in my country and other countries in the world, the increasing number of rail lines and locomotives makes the criss-crossing rail traffic increasingly busy. As well as accurate speed measurement and other aspects put forward higher requirements. In view of such a situation, traditional electrical sensors can no longer meet the needs in many places with strong electromagnetic interference, and there are great hidden dangers in their reliability and safety. [0003] Optical fiber distributed sensor is a distributed stress sensing system based on optical time domain reflectometry (OTDR). This technology is due to the limitation of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/26
CPCG01D5/268
Inventor 宋情吴宇彭飞饶云江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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