Short-Time Behaviour in Pulsed Eddy-Current Nondestructive Evaluation
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
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The resurgence of interest in pulsed eddy-current nondestructive evaluation (NDE) is motivated by the ability of the technique to detect deeply-buried defects in multi-layer aircraft structures and to obtain broad-band frequency information [1–4]. In this sense, the pulsed technique is a natural extension of dual- and multi-frequency eddy-current techniques. However, unlike conventional eddy-current NDE, for which the effects of coil lift-off variation can be readily discriminated using phase plane analysis, the most appropriate method for dealing with variation in coil lift-off in pulsed eddy-current NDE remains an open question. Clearly, a first step in the development of algorithms for lift-off compensation is to construct a method to determine the coil lift-off from measurements of the coil response, independent of other variations.