Underground pipeline damage detection method and system

Abstract

The invention discloses an underground pipeline damage detection method and system. The method specifically comprises the steps of actively simulating variable sound signal and coupling the sound signal into a pipeline, modulating a backward scattered light signal in an optical fiber when the sound signal is transmitting in the pipeline, and acquiring the backward scattered light signal carrying sound signal information in the optical fiber; demodulating the backward scattered light signal to acquire time domain information of the sound signal to be detected; separately performing Fourier transform and wavelet transform on the time domain information of the sound signal, to acquire first and second feature parameters of the sound signal to be detected; and using the feature parameters of the sound signal to be detected as inputs, and detecting the position and degree of a damage of an underground pipeline via feature extraction and other methods. According to the method and system provided by the invention, the active sonic flaw detection method is used, the detection of the internal damage of the long underground pipeline is achieved through controlling the frequency and amplitudeof the sound signal, and the feature parameters of the sound signals of the different positions of the damaged pipeline are used for accurately positioning the damage position of the pipeline and assessing the damage degree.

Description

technical field [0001] The invention belongs to the field of distributed acoustic wave sensing systems, and more specifically, relates to a detection method and system for underground pipeline damage Background technique [0002] Pipelines are an essential part of the world's physical and energy supply infrastructure. Various types of piping are used throughout the world, from local industrial piping systems to global piping spread across continents. As the world's pipeline infrastructure grows and ages, so does the need to monitor the safe and reliable operation of pipelines. In recent years, distributed fiber optic sensors have attracted more and more attention for various monitoring tasks in the pipeline industry due to their advantages such as long distance and high sensitivity. [0003] At present, the pipeline safety monitoring system based on distributed acoustic wave sensing technology is mainly based on the passive measurement of self-emitted sound waves in the pi...

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Problems solved by technology

[0005] In view of the defects of the prior art, the object of the present invention is to provide a detection method and system for underground pipeline damage, aiming to solve the problem that the existing passive pipeline damage monitoring system based on acoustic emission is difficult to evaluate the damage degree of underground pipelines

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