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The analytical forward model of a probe coil located over multi-layered conductive structures in eddy current testing is investigated and the calculation technique for the impedance model is presented. For multi-layered thickness measurement using the ECT method, the inverse model is investigated and three inversion methods including the least squares method, Back Propagation (BP) and Radial Based Function (RBF) neural network method are presented. The thickness measurement of a four-layer structure is carried out and the excellent experimental inversion results show the merits of the techniques studied.
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Huang et al. (2006) studied this question.
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