The theory and makeup of the pulsed eddy-current(PEC) nondestructive testing(NDT)system
which is included the excitation source
signal magnifying and A/D transformation
is presented.The surface crack on the metal tested by using the cylinder inductance sensor is introduced.When the excitation frequency is 1 000 Hz and time-empty ratio is 45 %
5
5 %
the experiment test results are optimum
as well as for PCI1712 data collections when the excitation voltage is 7.5 V and signal amplifier multiple is 1 000.The crack depths is corresponding to the eddy-current scope.