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Nondestructive Testing and Evaluation
Year: 2010  |  Volume: 25  |  Issue: 1  |  Page No.: 77 - 89

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    

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.

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