Abstract
Eddy current testing (ECT) is a widely used nondestructive testing method in many such fields as the power system, railway, machinery, aircraft and nuclear industries. Beca use of the limitation of penetration depth of the conventional eddy currents testing coils and other affecting factors existin g in the eddy current response, inverse problems to evaluate the deep defects from ECT signals of the conductive materials have been a challenging task. The objectives of this study are to int roduce methods based on the fuzzy Bayesian networks (BNs), and the giant magnetoresistance (GMR) sensors to estimate the deep defects from their ECT signals. The experimental validation carried out on the specimens with different known defects confirmed the suitability of the proposed approach for deep defects evaluation.
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