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Method for quickly positioning phase-sensitive optical time-domain reflection distributed optical fiber sensing system

A technology of distributed optical fiber and phase-sensitive light, which is applied in the direction of using optical devices to transmit sensing components, etc., can solve the problems of large amount of demodulation calculation and large amount of signal data, and achieve the effect of reducing the calculation burden

Active Publication Date: 2017-08-29
SHANGHAI UNIV
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Problems solved by technology

[0004] In order to solve the above problems, the present invention proposes a phase-sensitive optical time-domain reflection distributed optical fiber sensing system rapid positioning method, which solves the problem of large amount of demodulation calculations caused by the large amount of signal data in the coherent detection Ф-OTDR optical fiber sensing system difficult problem, and this method is suitable for various Ф-OTDR systems with coherent detection and demodulation

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  • Method for quickly positioning phase-sensitive optical time-domain reflection distributed optical fiber sensing system
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  • Method for quickly positioning phase-sensitive optical time-domain reflection distributed optical fiber sensing system

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[0024] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the accompanying drawings and specific implementation examples. Since this solution can be expanded or deformed in many ways, and the devices involved can be replaced with devices of different models with similar functions, this should not limit the scope of protection of this patent.

[0025] see figure 1 , the phase-sensitive optical time-domain reflection distributed optical fiber sensing system applied by the method of the present invention includes a narrow linewidth laser 1, a 1´2 fiber coupler 2, an acousto-optic modulator 3, an erbium-doped fiber amplifier 4, and a fiber circulator 5 , sensing fiber 6, arbitrary waveform generator 7, 2´2 fiber coupler 8, balanced light detector 9, data acquisition card 10, computer 11, piezoelectric ceramic tube 12.

[0026] The components of each par...

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Abstract

The invention relates to a method for quickly positioning a phase-sensitive optical time-domain reflection distributed optical fiber sensing system. The method comprises the following steps of: constructing a Rayleigh scattering light digital signal matrix corresponding to a plurality of optical pulses; selecting test windows and test columns on the signal matrix at certain intervals; acquiring the phases of respective test columns; roughly positioning a disturbance source section according to adjacent test windows test column phase; and extracting a section signal (between two adjacent test window test columns) including the disturbance source for accurate disturbance positioning. The method analyzes the phase relation of the Rayleigh scattering light at different positions of an optical fiber to realize a rough positioning-precise positioning process of a [phi]-OTDR optical fiber sensing system, reduces the burden of the system by neglecting a large amount of invalid sensing information, solves poor real-time performance in the distributed sensing system caused by a large signal data size and a large system calculation magnitude, and is suitable for various coherent detection demodulation [phi]-OTDR system.

Description

technical field [0001] The invention relates to a fast positioning method for a phase-sensitive optical time domain reflection distributed optical fiber sensing system, which belongs to the application field of optical fiber sensing technology. Background technique [0002] Phase-sensitive Optical Time Domain Reflectometry (Phase-sensitive Optical Time Domain Reflectometry, abbreviated as Ф-OTDR or Phase-sensitive OTDR) is a distributed optical fiber sensing system with anti-electromagnetic interference, anti-corrosion, remote measurement, good insulation , Intrinsic safety, high spatial resolution, simple equipment laying, no blind spots, low maintenance costs and other advantages. The introduction of coherent detection and demodulation technology makes Ф-OTDR have higher sensitivity and phase demodulation capability. In recent years, coherent detection Ф-OTDR has attracted widespread attention and has been put into practical use. At present, Ф-OTDR has demonstrated its gr...

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Application Information

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IPC IPC(8): G01D5/36
Inventor 庞拂飞梅烜玮王廷云吕龙宝刘奂奂宋英雄陈健李迎春张俊杰
Owner SHANGHAI UNIV
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