Optimization Design Method for Excitation Magnetic Field in Motion Induced Eddy Current Magnetic Field Testing

In the process of production or use, micro defects (micro particles pores) will be produced in thin metal plate. The number and size these determine quality plate, affecting its service life factor safety.Therefore, quantitative accurate characterization is a necessary condition to ensure safety plate products.This article studies application motion induced eddy current magnetic field testing electromagnetic detect conductive non materials.The simulation results show that when lift off distance surface remanence permanent magnet are determined, positively correlated with amplitude defect detection signal.The main reason signal linearly related density mode at various points on path electric without defects. Increasing can effectively improve mode.As continuation above results, an optimization method for excitation has been proposed.The two types arrays generated by this generate larger signals compared simple magnets same volume residual magnetism. experimental arrangement designed increases 80-90% traditional methods.This helps sensitivity methods.