Multipoint disturbance detecting and locating method of polarization sensitive optical time domain reflectometer (P-OTDR)

An optical time domain reflectometer and polarization-sensitive technology, which is applied in the direction of transmitting sensing components using optical devices, can solve the problem of being unable to distinguish multiple disturbance points

Inactive Publication Date: 2014-12-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to provide a multi-point disturbance detection and positioning method for a polarization-sen

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  • Multipoint disturbance detecting and locating method of polarization sensitive optical time domain reflectometer (P-OTDR)
  • Multipoint disturbance detecting and locating method of polarization sensitive optical time domain reflectometer (P-OTDR)
  • Multipoint disturbance detecting and locating method of polarization sensitive optical time domain reflectometer (P-OTDR)

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Embodiment 1

[0038] The present invention is a multi-point disturbance detection and positioning method for a polarization-sensitive optical time-domain reflectometer. As Embodiment 1 of the present invention, the overall composition of the polarization-sensitive optical time-domain reflectometer (P-OTDR) system is as follows: figure 1 shown. The system consists of three main parts, detection optical cable, optical signal demodulation equipment (including light source), processing host, and specific equipment and devices include lasers that generate ultra-narrow coherent pulses, acousto-optic modulators, and erbium-doped fiber amplifiers (EDFA). , isolators, polarizers, optical circulators, common single-mode fiber near the perimeter or buried underground for sensing outside intrusion, polarization beam splitters, photodetectors to detect optical signals, signal acquisition devices, and central processing units . Other amplification devices are selected according to the monitoring distanc...

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Abstract

The invention provides a multipoint disturbance detecting and locating method of a polarization sensitive optical time domain reflectometer (P-OTDR), and belongs to the field of distributed type optical fiber sensing and distributed type optical fiber sensing application. Optical time domain signals of the P-OTDR at different moments are accumulated, time-space-axis signals are interlinked to form a two-dimensional original signal matrix, after difference and binarization processing, binarized difference images are subjected to horizontal accumulation preprocessing, and the purpose of multipoint disturbance detecting and high-precision locating of the P-OTDR can be achieved in the mode that the preprocessed binarized difference images are subjected to edge detection and automatic classification. The method has wide application value in the field of safety monitoring of long-distance circumference security and protection, oil and gas transmission pipelines, aerial cables, underground cables and the like.

Description

technical field [0001] The invention relates to the field of distributed optical fiber sensing and its application, in particular to a multi-point disturbance detection and positioning method for a polarization-sensitive optical time domain reflectometer. Background technique [0002] Polarization-sensitive optical time domain reflectometry (P-OTDR), which uses the change in the polarization state of Rayleigh scattering light inside the optical fiber to sense the spatial distribution and time-varying information of strain, disturbance, etc. on the transmission path, It is a typical fully distributed optical fiber sensing technology, passive in the whole process, and plays an important role in the fields of long-distance perimeter security, long-distance oil and gas pipeline safety, power transmission cable and buried optical cable safety monitoring, and large-scale structural health monitoring. The country has a major demand for security monitoring of borders and important i...

Claims

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Application Information

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IPC IPC(8): G01D5/26
Inventor 吴慧娟刘军张林强饶云江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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