Eddy-current inversion for the determination of crack geometry

In eddy-current inversion the aim is to find the shape and size of a flaw from a set of probe measurements. This may be difficult for an irregular crack simply because an accurate formal description is complicated but in most cases the gross features can be well characterized by making a number of simplifying assumptions. Assuming that the crack is impenetrable to eddy-current and lies in a known plane, the problem of predicting probe signals has been solved using a numerical model. The model is an integral part of a scheme to deal with the corresponding inverse problem in which the location of the edge of the crack is found using eddy-current probe impedance measurements