Abstract
A forward calculation method is presented for the analysis of the interaction of a pancake type eddy current testing (ECT) coil and an arbitrary shape thin metal deposit located on the reverse side of a plate specimen. The deposit is modelled as an infinitesimally thin layer where the impedance type boundary conditions are enforced. The given boundary conditions result an integral equation which solution provides the actual distribution of secondary sources modelling the presence of the deposit. Knowing these secondary sources, the signal of the ECT probe is calculated. Based on the developed forward solution, a proposal for a method reconstructing the shape of the deposit from measured ECT signal is outlined.
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