Defect classification by pulsed eddy current technique in con-casting slabs based on spectrum analysis and wavelet decomposition.

Highlights: [•] A new PEC feature (spectrum analysis after wavelet decomposition) is investigated. [•] The spectrum of the detail decomposited exceeding 1.7kHz is more effective. [•] The high-frequency components are dominant among the surface and sub-surface defects. [•] The PCA-LDA and Bayesian classifier can correctly classify all kinds of defects. [ABSTRACT FROM AUTHOR]