Strong Coupled Formulation of the Magnetic Vector Potential and Total Current Density for Eddy Current Testing with Skin and Proximity Effects

Abstract

This paper presents an Eddy Currents Testing (ECT) model including skin and proximity effects occurring in the sensor and the tested sample. The Finite Element computational model is based on the strong coupling of the magnetic field magnetodynamic equation expressed in term of magnetic vector potential and the total current density equation composed by the source and eddy current densities terms. The effectiveness of the proposed model is investigated through the comparisons of the imp with the classical current fed models in where massive or multiconductors sensors configurations naturally avoid skin and proximity effects.