Abstract
To evaluate subsurface material defects, a digital signal processing system has been developed that is matched to the particular requirements of pulsed eddy-current techniques. The signal processing is designed to obtain information about defect depth within thick components or the residual wall thickness of corroded tubes or austenitic container walls. It is found that it is possible to reconstruct the pulse response signal from 8 to 10 sampled and stored amplitude values. The zerocrossing point of the signal, which is a measure of the defect depth, is relatively simple to determine from an analytical function.
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