Pipeline anti-corrosion layer tiny damage point positioning method based on stationary wavelet transform

Abstract

The invention relates to a pipeline anti-corrosion layer tiny damage point positioning method based on stationary wavelet transform. The method comprises the following steps of S1, obtaining to-be-detected pipeline power-off potential signals of a plurality of point positions; S2, performing stationary wavelet transform processing on the obtained power-off potential signals to obtain a detail coefficient containing damage information; S3, performing soft threshold de-noising processing on the detail coefficient containing the damage information to obtain a new coefficient; S4, obtaining information of a pipeline anti-corrosion layer damaged point through the coefficient, marking the point, and re-planning a measurement interval by taking the point as a center; and S5, cycling steps S2-S4, and determining the position of the anti-corrosion layer damaged point. According to the method, the information of the pipeline anti-corrosion layer tiny damage point can be effectively represented, and when the distance exists between the damage point and the measurement point of a reference electrode, a damage point signal near the measurement point can also be identified.

Description

technical field [0001] The invention belongs to the technical field of pipeline anticorrosion layer damage point detection, and in particular relates to a method for locating tiny damage points of pipeline anticorrosion layer based on stationary wavelet transform. Background technique [0002] The stray current of the subway greatly interferes with the buried pipeline, and the anti-corrosion layer of the buried pipeline can effectively protect the pipeline from the influence of the stray current. The pipeline anti-corrosion layer will inevitably be damaged during the construction process and after years of use. Once the pipeline anti-corrosion layer is damaged, it will suffer from electrochemical corrosion caused by stray current, resulting in leakage or even explosion of the pipeline. According to data, after several years of operation of the Beijing Subway, the pipes in its tunnels were severely corroded. It was investigated that the corrosion was caused by stray currents...

AI Technical Summary

Problems solved by technology

The existing pipeline anti-corrosion layer detection technology cannot extract the signal of small damage points, for example, the damage point is located below the pipeline anti-corrosion layer, there is a certain distance between the measurement point and the damage point, and the area of ​​the damage point of the anti-corrosion layer is small, etc.

This leads to an inaccurate assessment of the integrity of the pipeline coating

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