Semianalytical method for calculating the impedance variation of an arbitrary eddy-current probe

Abstract

We present an explicit analytical solution to the problem of a point current source in a half-space or a plate. Under the hypothesis of a first-order Born approximation, the expression of the vector potential above the plate can then be used to calculate impedance variations due to a flaw in a number of configurations. We demonstrate the method and validate it on a simple case.