Signal processing method for distributed optical fiber vibration measurement system based on wavelet analysis

A distributed optical fiber and vibration measurement technology, applied in the direction of measuring devices, measuring ultrasonic/sonic/infrasonic waves, using wave/particle radiation, etc., can solve the problems of high false alarm rate, high system sensitivity, and limited system application, etc., and achieve reduction System false positive rate, reduce the effect of system false negative rate

Inactive Publication Date: 2013-06-05
SHANGHAI BOOM FIBER SENSING TECH
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Problems solved by technology

However, due to the relatively large noise and the high sensitivity of the system, a slight vibration of the optical cable can also cause changes in the interference signal. It is difficult to find a threshold that can accurately distinguish which types of vibration events are false alarms and which types of events are real intrusions The generated vibration events are based on the time-domain signal processing method, the system has a high false alarm rate and a high false alarm rate, which limits the application of the system

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  • Signal processing method for distributed optical fiber vibration measurement system based on wavelet analysis
  • Signal processing method for distributed optical fiber vibration measurement system based on wavelet analysis
  • Signal processing method for distributed optical fiber vibration measurement system based on wavelet analysis

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Embodiment Construction

[0033] Taking the 3-layer decomposition of the signal as an example, the test results after the 3-layer decomposition of the signal of the distributed optical fiber vibration measurement system show that after wavelet transformation, the first layer of wavelet detail coefficient mainly reflects the characteristics of noise, and the third layer of wavelet The approximation coefficients mainly reflect the characteristics of the background signal, and the remaining second-level wavelet detail coefficients and third-level wavelet detail coefficients mainly reflect the characteristics of the vibration signal. The selection of the threshold is also based on the empirical value of the test results. The specific implementation steps are:

[0034] The first step is to perform three-level wavelet decomposition on the collected data S (that is, the digital signal after analog-to-digital conversion) to obtain the first-level wavelet detail coefficient D 1 , the second layer wavelet detai...

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Abstract

The invention discloses a signal processing method for a distributed optical fiber vibration measurement system based on wavelet analysis. The time domain and the frequency domain of signals are simultaneously analyzed by means of wavelet analysis, the signals are multi-resolution, and each moment of the signals can be analyzed, so that original signals are effectively extracted from the signals mixed with strong noise. The signal processing method has the advantages that on one hand, the noise and background signals can be effectively removed, real vibration signals are effectively restored, on the other hand, multi-resolution analysis is performed for the vibration signals, misinformation vibration signals and the real intrusion vibration signals are distinguished by the aid of experience wavelet coefficient threshold values, and accordingly, the misinformation rate and the missing report rate of the system are reduced.

Description

technical field [0001] The invention relates to the technical field of signal processing of a distributed optical fiber vibration measurement system, in particular to a signal processing method of a distributed optical fiber vibration measurement system based on wavelet analysis. Background technique [0002] Distributed optical fiber vibration measurement system is a long-distance, positionable distributed vibration measurement system based on the principle of optical fiber sensing technology. This type of system is widely used as a security intrusion prevention system for national defense borders, oil pipelines, high-speed Fields that require long-distance monitoring, such as railway guardrails. The system comprehensively uses optical time domain reflectometry (OTDR) and optical fiber interference technology, so it has the advantages of high positioning accuracy of OTDR technology and good detection sensitivity of optical interference technology, so it is very suitable for...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
Inventor 黄正
Owner SHANGHAI BOOM FIBER SENSING TECH
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