FINITE-ELEMENT NUMERICAL-SIMULATION FOR EDDY-CURRENT TRANSDUCER WITH ORTHOGONAL COILS

In this paper we present a numerical simulation of an eddy current tra nsducer with orthogonal coils. The investigation develops a 3D numeric al analysis based on the magnetic scalar and Vector potentials. In ord er to test the accuracy of our numerical analysis we used both the sta ndard finite element method and the hierarchical finite element method of high order. It is found that the image from the transducer when it passes over a discontinuity is in excellent agreement with 3D theoret ical predictions. This numerical modelling approach is very useful in analyzing and optimizing transducers with orthogonal coils. (C) 1997 E lsevier Science S.A.