A single coil electromagnetic resonance detection method for metal pipeline damage

Abstract

The present invention proposes a single-coil electromagnetic resonance detection method for damage to metal pipelines. The detection coil and capacitor are connected in parallel to form an LC resonant circuit, and the type, position, depth and width of pipeline damage are qualitatively and quantitatively analyzed by detecting changes in the inductance value of the coil. . The method of the present invention is still effective for non-ferromagnetic metal pipelines, ensuring a wide range of applications; the detection coil can adopt non-contact detection, and can be applied to harsh environments such as dust, dirt, and oil; the detection system uses a single coil as a sensor to detect The system is simple in structure and low in cost; it overcomes the problems of complex structure of the detection system, cumbersome data processing process, and unsatisfactory detection effect on axial cracks in the current damage detection of metal pipelines.

Description

technical field [0001] The invention belongs to the field of non-destructive testing, in particular to a method for detecting metal pipeline damage. Background technique [0002] At present, the main methods used for damage detection of metal pipelines are: magnetic flux leakage detection method, which usually excites the ferromagnetic pipeline, and detects the pipeline damage by detecting the magnetic flux leakage signal of the pipeline. Pipeline axial crack damage requires the design of a special excitation structure in order to obtain ideal detection results. The traditional eddy current detection method is usually composed of a transducer, an excitation coil, a detection coil, and a signal conditioning circuit. The detection process requires a large excitation signal source, and the detection signal acquisition and analysis process are relatively complicated. [0003] In the current technology, whether magnetic flux leakage detection or eddy current detection is used, t...

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Problems solved by technology

The method of the present invention is still effective for non-ferromagnetic metal pipelines, ensuring a wide range of applications; the detection coil can adopt non-contact detection, and can be applied to harsh environments such as dust, dirt, and oil; the detection system uses a single coil as a sensor to detect The system structure is simple and the cost is low; it overcomes the problems of complex structure of the detection system, cumbersome data processing process, and unsatisfactory detection effect on axial cracks in the current metal pipeline damage detection

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