Event Title

Short-Time Behaviour in Pulsed Eddy-Current Nondestructive Evaluation

Location

Snowbird, UT, USA

Start Date

1-1-1999 12:00 AM

Description

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.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

18A

Chapter

Chapter 2: Electromagnetic, Thermal, and X-Ray Techniques

Section

John Moulder Memorial Session/Eddy Currents

Pages

485-492

DOI

10.1007/978-1-4615-4791-4_61

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Short-Time Behaviour in Pulsed Eddy-Current Nondestructive Evaluation

Snowbird, UT, USA

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.