Design and Optimization of Excitation Signal in Multi-Frequency Eddy Current Testing Based on Spectrum Analysis Method

A multi-frequency eddy current testing system based on spectrum analysis method is designed with virtual instrument technique. Design and optimization of testing systems excitation signals are studied. The excitation signal is generated with software in simultaneously synthesized method or in frequency modulation method. The initial phases of each frequency component are optimized to reduce crest factor in the former method. Tukey window function is adopted to eliminate ripples of testing signals spectrum in the latter method.