In this paper we present a method to determine the current density inside an aluminum plate [1]. The general idea consists in generating eddy currents in the plate which, in the case of flawless material, must be of uniform density pointing along a pre-defined direction inside a given area on the plate surface. These currents are produced using a plane coil with parallel circuit lines capable of producing a constant excitation magnetic field inside that area. This
coil is depicted on the left side of Fig.1, and on the right side, the experimental setup circuitry is represented as well. Using this method the aluminum plate senses an excitation field that is invariant under limited translations.