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Precise Positioning Method for Phase Sensitive Optical Time Domain Reflectometry Distributed Optical Fiber Sensing System

A distributed optical fiber and phase-sensitive light technology, which is applied in the direction of transmitting sensing components with optical devices, can solve the problems of increasing the amount of demodulation calculation and affecting the response speed of the system, so as to achieve the effect of ensuring stability and improving response speed

Active Publication Date: 2019-07-23
SHANGHAI UNIV
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Problems solved by technology

However, Ф-OTDR is a distributed sensor, and each point of its sensing fiber can be used as an independent sensor. The longer the sensing fiber, the more sensing data will be generated, which will increase the amount of calculation for demodulation and affect the system response. speed

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  • Precise Positioning Method for Phase Sensitive Optical Time Domain Reflectometry Distributed Optical Fiber Sensing System
  • Precise Positioning Method for Phase Sensitive Optical Time Domain Reflectometry Distributed Optical Fiber Sensing System
  • Precise Positioning Method for Phase Sensitive Optical Time Domain Reflectometry Distributed Optical Fiber Sensing System

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[0020] 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.

[0021]see figure 1 , the phase-sensitive optical time-domain reflection distributed optical fiber sensing system applied by this method, comprising 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 optical fiber 6, arbitrary waveform generator 7, 2×2 optical fiber coupler 8, balanced light detector 9, data acquisition card 10, computer 11, piezoelectric ceramic tube 12.

[0022] The components of each part of th...

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Abstract

The invention relates to a precise positioning method of a phase-sensitive optical time domain reflection distributed type fiber sensing system. The method comprises following steps of constructing Rayleigh scattering optical digital signal matrixes corresponding to multiple optical pulses; selecting a to-be-detected signal matrix; determining system spatial resolution, and carrying out iteration on 'comparison of phase positions of two ends of the to-be-detected signal matrix-comparison of the length of the to-be-detected signal matrix and the system spatial resolution-midpoint segmentation of the to-be-detected signal matrix' until a certain condition is met; and exiting the method. According to the invention, by combining the advantages of the phase position positioning and the idea of the 'dichotomy', through the interval halving and iteration approximation, quite less calculation and judgment are used, so precise positioning of disturbance sources in the distributed fiber sensor is achieved, the high resolution and stability of the system space are ensured while system response speed is increased, and the method is suitable for all kinds of phi-OTDR fiber sensing systems for coherent detection and demodulation.

Description

technical field [0001] The invention relates to a precise 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 fully distributed optical fiber sensing system with anti-electromagnetic interference, anti-corrosion, small size and high safety It has the advantages of high reliability, high spatial resolution, simple equipment laying, no blind spots, and low maintenance costs. The introduction of optical coherent demodulation detection makes Ф-OTDR have higher sensitivity and phase demodulation ability. In recent years, coherent Ф-OTDR has attracted widespread attention and has been put into practical use. At present, Ф-OTDR has demonstrated its great value in m...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/36
CPCG01D5/36
Inventor 庞拂飞梅烜玮刘奂奂王廷云吕龙宝宋英雄陈健李迎春张俊杰
Owner SHANGHAI UNIV
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