Solution to the Problem of Cup-Cored Coil Above a Layered Half-Space

An axisymmetric cup-cored coil placed above a layered conductive half-space is analyzed by using the truncated region eigenfunction expansion method. Closed-form expressions are presented for the coil impedance as well as the induced eddy current density. The results are in very good agreement with results from 2D-FEM and with experi- mental ones.