Distributed optical fiber sound sensing and positioning system

A distributed optical fiber and optical fiber technology is applied in positioning, radio wave measurement system, and measurement of ultrasonic/sonic/infrasonic waves. The effect of good correlation, high resolution and long monitoring distance

Active Publication Date: 2019-11-26
TAIYUAN UNIV OF TECH
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Problems solved by technology

Its purpose is to solve the problem that the signal demodulation of the existing ϕ-OTDR fiber optic acoustic sensor is relatively complicated, it is greatly affected by the environment, and the problem that the MZI fiber optic acoustic sensor cannot locate the sound source

Method used

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  • Distributed optical fiber sound sensing and positioning system

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specific Embodiment approach

[0011] The narrow linewidth laser 1 emits a strong coherent continuous optical signal with a central wavelength of 1550nm, and its output end is connected to the first optical modulator 2 to modulate the continuous optical signal into a pulse signal; the output of the first optical modulator 2 end is connected to the input end of the optical fiber amplifier 3 to amplify the pulsed optical signal; the output end of the optical fiber amplifier 3 is connected to the input end of the first filter 4 to filter out the noise doped in the optical signal with a center wavelength of 1550nm signal; the output end of the first filter 4 is connected to the incident end of the first optical circulator 5 a ; The reflective end of the first optical circulator 5 b connected to the input of the first fiber coupler 6 a , the optical signal with a center wavelength of 1550nm is incident into the sensing fiber; the output end of the first optical circulator 5 c Be connected to the input end of t...

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Abstract

The invention relates to a distributed optical fiber sound sensing and positioning system, which performs optical fiber sound detection by means of a Mach-Zehnder interference and phase-sensitive optical time domain reflection mixed structure, combines an MZI interference type optical fiber sound sensing system and a phi-OTDR optical fiber vibration positioning system, and realizes restoration andpositioning of external sound signals simultaneously. Compared with an existing distributed optical fiber vibration measurement technology, the distributed optical fiber sound sensing and positioningsystem has the advantages of low cost, high reliability, high real-time monitoring capacity, long monitoring distance and high resolution, can realize restoration and positioning of vibration sound signals simultaneously, and has huge application potential in long-distance safety detection of natural gas, petroleum pipelines and the like. In addition, a chaotic light source used in an MZI opticalpath of the distributed optical fiber sound sensing and positioning system has the advantages of wide spectrum, more carried information, good autocorrelation and low autocorrelation noise, and can suppress scattering noise in the optical path and increase the signal-to-noise ratio, thereby improving the response sensitivity of the device.

Description

technical field [0001] The invention relates to the technical field of distributed optical fiber sensing, in particular to a distributed optical fiber sound sensing and positioning system. Background technique [0002] Aiming at the problem that traditional electroacoustic sensors cannot be applied to extreme sites such as strong electromagnetic interference, humidity, and corrosion, many types of fiber optic acoustic sensors have been proposed. Distributed fiber optic acoustic sensors have the advantages of anti-electromagnetic interference, chemical corrosion resistance, long transmission distance, strong real-time monitoring capability, and high cost performance. They can be used in perimeter security and earthquake monitoring, including long-distance natural gas, oil pipelines, and submarine pipelines. health check. The detection range of the fiber optic acoustic sensor can reach tens of kilometers, and the sound source may occur anywhere, so it is very necessary to rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00G01S5/16
CPCG01H9/004G01S5/16
Inventor 靳宝全苑宏宇王宇刘昕白清张红娟高妍
Owner TAIYUAN UNIV OF TECH
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