Research Article
Reduction of lift-off effect for pulsed eddy current NDT based on sensor design and frequency spectrum analysis

Binfeng Yang, Bin Li and Yunjiang Wang

Nondestructive Testing and Evaluation, 2010, 25(1), 77-89. DOI: 10.1080/10589750902994415

Abstract

Pulsed eddy current (PEC) nondestructive testing (NDT), as for most of EC techniques, is prone to lift-off effect, which influences the interpretation and quantification of flaw. A new technique for reducing the lift-off effect and quantifying flaw based on sensor design and frequency spectrum analysis is proposed. The technique exploits the self-differential feature of the sensor and the broadband frequency spectral content of pulsed excitation. Results show that the lift-off has been significantly reduced and the precision of quantification of flaw has been improved.

ASCI-ID: 185-42

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