In-pipeline detection method for detecting differential magnetic conductivity based on eddy current under bias magnetization
A dynamic permeability and eddy current detection technology, applied in the direction of material magnetic variables, etc., can solve the problems of inability to detect outer wall defects, placement of large magnetizers, and inability of pipes to be magnetized, etc., achieving easy arraying and modularization. Low consumption and simple structure
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[0025] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
[0026] The method of the invention magnetizes the pipeline through a DC magnetizer. Although the pipeline is in a weakly magnetized state, the leakage magnetic field generated by the defects on the outer wall of the pipeline cannot propagate to the inner wall. However, due to the obstruction of the outer wall defects on the magnetizing field, the magnetic field will bypass the defects and gather Above the defect, the magnetic flux density increases. According to the B-H curve of the material, the increase of the magnetic flux density will cause the magnetic permeability of the material to decrease. Therefore, the magnetic permeability will be distorted above the outer wall defect compared to the defect-free position. Due to the magnetic permeability Distortion acts as a hindrance to an applied magnetic field, and this permeability distor...
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