The Distinguishing Permeability Variation Eddy Signal in Steam Generator Heat Exchanger Tubes by Numerical Calculation

Steam Generator Heat Exchanger Tubes model with the exceptional permeability variation(PVN) in eddy current testing is simulated and calculated by numerical simulation method, and the transformation relations with permeability variation under different conditions were obtained, which is used to contrast with actual defect signal. So we can distinguish PVN by the difference with response phase and transformation rule, which enhances the veracity and reliability of analysis with eddy current testing.