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Identification of multiple cracks from eddy-current testing signals with noise sources by image processing and inverse analysis

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4 Author(s)
Y. Nagaya ; Graduate Sch. of Eng., Tohoku Univ., Sendai, Japan ; T. Takagi ; T. Uchimoto ; Haoyu Huang

This paper proposes a novel method for identifying the number and positions of cracks and reconstructing crack shapes. It assumes that two-dimensional scanned eddy-current testing (ECT) signals obtained from a steam generator tube are a picture image, then a template matching method with the help of genetic algorithms predicts the number and positions of cracks. The present method employs the superposition of crack signals and a nonlinear scaling technique of a signal profile on the crack length that are verified by numerical simulation. The number and positions of the cracks are satisfactorily predicted. The crack-shape reconstructions from the predicted positions with the help of inverse analysis are achieved with a satisfactory degree of accuracy.

Published in:

IEEE Transactions on Magnetics  (Volume:40 ,  Issue: 2 )