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Time Domain Processing of Pulsed Differential Eddy Currents Testing Signals

Rosado, L. S. ; Ramos, P.M. ; Piedade, M. S.

Time Domain Processing of Pulsed Differential Eddy Currents Testing Signals, Proc IMEKO TC4 Symp., Barcelona, Spain, Vol. 19, pp. 345 - 350, July, 2013.

Digital Object Identifier: 0

Abstract
The use of pulsed stimulus on Eddy Currents Testing is currently applied on multiple applications from conductivity measurements to defects detection on metallic parts. This type of stimulus is frequency rich since it is composed by multiple harmonics and this allows testing with different depth concentration of the eddy
currents as they are subject to the skin effect. In this paper, pulsed stimuli are used while testing with a custom probe. The probe output signals are acquired and processed digitally in the time domain using a simple feature, its RMS value. Two-dimensional scans were performed allowing the imaging of a tested metallic part with
different defects.