Pulsed eddy current testing is one of the important methods of modern nondestructive testing technology. Since it has characteristics of wide spectrum

strong signal penetrating power and high precision

at present it has been widely used in metal thickness measurement

etc. Based on Ansoft Maxwell software

pulsed eddy current multi-layer metal thickness measurement system is established

the thickness for different conductivity of metal material simulation analysis and research

by changing the thickness of the tested body

analyze on rule of test coil voltage changing with thickness of the measured body

and FFT is carried out on detecting signal of thickness of pulsed eddy current

extraction of characteristic value is carried out in time domain and frequency domain

analysis on different conductivity layer

and suitable characteristic value is given.