Research on Interstitial Eddy Currents Detection Methods between Two - layer Conductors based on Apparent Conductivity Curve

In aviation, energy and other fields, the Two-layer Conductors Slabbed Construction has a very wide range of applications, so its reliability is crucial to the operation of the system. However, the traditional testing methods are often limited by complex environment and structural characteristics, but as a nondestructive testing technology, eddy current testing has the advantages of non-contact and high resolution, so it has attracted much attention. As for Two-layer Conductors Slabbed Construction, it is of great theoretical and practical value to accurately detect the internal defects and gaps by analyzing the electromagnetic characteristic changes caused by eddy currents. This study takes the eddy current detection method based on apparent conductivity as the research topic, and explores the theory and method of eddy current detection of two-layer conductors slabbed spacing. First, it describes the physical mechanism of eddy current testing. Then, it analyzes the impedance characteristics of eddy current detection, proposes a two-layer conductors slabbed spacing eddy current detection method, and carries out sweep frequency test of eddy current detection impedance characteristics. On this basis, the analysis of two-layer conductors slabbed spacing eddy current inspection simulation is carried out. Finally, an inversion algorithm of eddy current detection based on orthogonal polynomial is proposed, and its validity is verified by simulation analysis.