Pipeline crack visual detection method and system based on three-dimensional induction eddy current magnetic field cloud picture

Abstract

The invention discloses a pipeline crack visual detection method and system based on a three-dimensional induction eddy current magnetic field cloud picture, and the method comprises the following steps: placing a detection probe on a to-be-detected metal pipeline, wherein the detection probe is used for generating an excitation signal of an eddy current magnetic field and measuring the size change of the magnetic field on the surface of the to-be-detected metal pipeline, and the detection probe comprises two coils and a plurality of magnetic field sensors arranged around the circumferential surface; generating an alternating magnetic field through an excitation coil so as to generate an induced current on the surface of the metal pipeline, obtaining the magnetic induction intensity of a disturbed area on the surface of the metal pipeline to be detected through a magnetic field sensor, and generating a magnetic induction intensity cloud picture according to the magnetic induction intensity and the position of the magnetic field sensor; and carrying out image preprocessing on the generated magnetic induction intensity cloud picture, and removing noise in the magnetic induction intensity cloud picture. The visual visualization of the pipeline crack defect can be realized, and the accurate evaluation of the pipeline defect is improved.

Description

technical field [0001] The invention relates to the technical field of non-destructive detection of pipeline cracks, in particular to a method and system for visual detection of pipeline cracks in a three-dimensional induced eddy current magnetic field nephogram. Background technique [0002] With the development of modern industrial technology, metal pipes play a pivotal role in various fields, and people's daily life is inseparable from various metal pipes. Due to long-term use or equipment aging, the surface of the metal material is often damaged to varying degrees and fails, which seriously affects the performance of the equipment, and may cause hazardous safety accidents such as leakage of dangerous goods and explosions. Therefore, it is important to conduct a comprehensive inspection of metal pipelines to ensure their integrity. Non-destructive testing technology processes and analyzes the changes caused by changes in the physical characteristics of materials to obtai...

AI Technical Summary

Problems solved by technology

Coil impedance is the result of the comprehensive action of magnetic field changes and other influencing factors in a limited interval. It provides one-dimensional information, which cannot effectively identify defects, and the detection error is large, so it cannot achieve accurate evaluation of material surface defects.

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