Research and Analysis of Eddy Current Testing Technology

Eddy current nondestructive testing is a field of considerable concern at present. As a newly emerging subject field, it has great vitality. On how to improve the level of detection field, this design applies MATLAB simulation software to realize the scientific operation and visual output of the mathematical expression of probe impedance when the detection probe is located above the double-layer conductive structure. So as to analyze the relationship between the electrical conductivity, magnetic permeability, thickness and coil impedance of the tested material. And the model can be used to study how to remove the interference caused by lift-off, edge and related factors to eddy current detection. The impedance model of cylindrical hollow coil is selected. It is the fundamental purpose of this design to get the detection value accurately and quickly so as to reconstruct the defects and cracks.