Distributed optical fiber sensing positioning method based on zero crossing point analysis

A distributed optical fiber, sensing and positioning technology, applied in the field of sensing and detection, can solve the problems of slow processing speed and low positioning accuracy, and achieve the effects of small positioning error, wide frequency bandwidth, and improved signal processing speed

Inactive Publication Date: 2014-08-20
TIANJIN UNIV
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low positioning accuracy and slow processing speed of the current distributed optical fiber sensing technology positioning algorithm

Method used

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  • Distributed optical fiber sensing positioning method based on zero crossing point analysis
  • Distributed optical fiber sensing positioning method based on zero crossing point analysis
  • Distributed optical fiber sensing positioning method based on zero crossing point analysis

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Embodiment

[0038] Such as figure 1 As shown, the system includes: laser 1, couplers 2, 5 and 6, optical circulators 3 and 4, sensing optical cable 7, photodetectors 8a and 8b, data acquisition card (DAQ Card) 9 and industrial control computer ( IPC) 10.

[0039] Among them, the data acquisition card (DAQ Card) 9 collects the voltage signals of the two photodetectors 8a and 8b, and sends them to the computer for processing. The industrial control computer (IPC) 10 analyzes and processes the data collected by the acquisition card.

[0040] The data acquisition card collects two signals and sends them to the computer. The computer obtains the frequency distribution of the disturbance frame signal through an improved zero-crossing rate analysis method, and uses the point near the maximum frequency point as an effective signal segment to estimate the cross-correlation time delay.

[0041] The following pairs figure 1 In the system shown, a certain positioning example is used to illustrate...

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Abstract

The invention discloses a distributed optical fiber sensing positioning method based on zero crossing point analysis. Frequency distribution of disturbance frame signals is obtained with an improved zero crossing point analysis method, and different from zero crossing rate analysis, the distributed optical fiber sensing positioning method is characterized in that average zero crossing amount is not directly calculated, the positions of zero crossing points in the signals are firstly found, the frequency of a certain section of the signals is estimated by comparing signal point numbers between adjacent zero crossing points, and the smaller the signal point numbers between the adjacent zero crossing points are, the higher the frequency of the section of the signals is. Points next to the maximum frequency point serve as effective signal sections to carry out cross-correlation time delay estimation, the effective signal sections contain high-frequency information of the signals and have the wide frequency bandwidth characteristics, and therefore the positioning error is small; meanwhile, due to the fact that the signal processing method based on zero crossing point analysis only contains simple calculation such as adding and subtracting, the calculation complexity is low, the signals with cross-correlation time delay estimation are only small parts of effective sections of a signal, and the signal processing speed is remarkably increased.

Description

technical field [0001] The invention belongs to the technical field of sensing and detection, in particular to a distributed optical fiber sensing positioning method based on zero-crossing point analysis. Background technique [0002] With the continuous progress of human society and the rapid development of science and technology, more and more attention has been paid to safety monitoring. In areas related to the national economy and people's livelihood such as electric power, water conservancy, and petrochemicals, as well as areas with high security requirements such as camps, airports, and prisons, the perimeter Security monitoring has been widely used, and in civil fields such as large exhibition halls and high-end residential areas, the demand for perimeter security monitoring is also increasing. [0003] Distributed optical fiber sensing technology based on double Mach-Zehnder interference principle uses light wave interference technology to realize intrusion detection...

Claims

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Application Information

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IPC IPC(8): G01D5/26
Inventor 刘琨刘铁根陈沁楠江俊峰丁振扬潘亮马春宇柴天娇何畅
Owner TIANJIN UNIV
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