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Chaotic modulation-based phase-sensitive optical time domain reflection vibration detection device

A technology of phase-sensitive light and chaotic modulation, applied in measuring devices, using wave/particle radiation, measuring ultrasonic/sonic/infrasonic waves, etc., to achieve high reliability, low cost, and good real-time performance

Inactive Publication Date: 2018-07-06
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0003] The present invention is a phase-sensitive optical time-domain reflection vibration detection device based on chaotic modulation, which overcomes the shortcomings of the prior art and solves the contradiction between the spatial resolution and the measurement distance of the current ϕ-OTDR vibration detection system

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  • Chaotic modulation-based phase-sensitive optical time domain reflection vibration detection device

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] Such as figure 1 As shown, a phase-sensitive optical time-domain reflection vibration detection device based on chaotic modulation of the present invention includes a narrow linewidth laser 1, a first optical modulator 2, a second optical modulator 3, an optical fiber amplifier 4, a filter 5, The first fiber coupler 6, the first photodetector 7, the first optical circulator 8, the Raman laser 9, the second fiber coupler 10, the first wavelength division multiplexer 11, the first fiber Bragg grating 12, the transmission Sensing optical fiber 13, second wavelength division multiplexer 14, optical isolator 15, second fiber Bragg grating 16, second photodetector 17, data acquisition device 18, signal processing device 19, display device 20, third photodetector 27 and a chaotic laser 21 composed of a semiconductor laser 22, a polarization controller 23, a second opt...

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Abstract

The invention discloses a chaotic modulation-based phase-sensitive optical time domain reflection vibration detection device, which belongs to the technical field of distributed optical fiber sensing.According to the technical scheme adopted to solve the technical problem, the device adopts a chaotic laser to carry out chaotic modulation on highly-coherent optical signals, the optical signals arethen injected to a sensing optical fiber, correlation operation is carried out on Rayleigh scattering optical signals generated in the sensing optical fiber and reference signals, and a vibration position is acquired. The device can be widely applied to a long-distance and high-definition distributed vibration detection field.

Description

technical field [0001] The invention discloses a phase-sensitive optical time-domain reflection vibration detection device based on chaotic modulation, which belongs to the technical field of distributed optical fiber sensing. Background technique [0002] In recent years, the rapid development of optical communication technology provides a platform for the application of optical fiber sensing technology. Compared with ordinary point sensors, distributed optical fiber sensors have the advantages of large measurement range, simple structure, corrosion resistance, anti-electromagnetic interference, and high cost performance. It has attracted widespread attention as soon as it appeared. Distributed fiber optic sensors can be applied to many fields, including health detection of long-distance natural gas, oil pipelines, and submarine pipelines. Among them, the phase-sensitive optical time-domain reflectometer (Phase-Sensitive Optical Time-Domain Reflectometer, ϕ-OTDR) based on ...

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Application Information

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IPC IPC(8): G01H9/00
Inventor 王云才刘昕王宇靳宝全白清王东张明江高妍张红娟
Owner TAIYUAN UNIV OF TECH
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