Modelling of a Differential Sensor in Eddy Current Non-Destructive Evaluation

Other conference contribution, 2011

Interaction between the probe and a defect in eddy current (EC) non-destructive evaluation (NDE) is studied. In this work a differential sensor is considered and the problem regarded here is problem 8 from the testing of electromagnetic analysis methods (TEAM) workshops. The truncation, referring to the position of the outer boundaries of the finite element model, is evaluated in three dimensions (3D) by the use of an analysis in axial symmetry. The results show that it is reliable to use a model size where the positions of the outer boundaries are put where the magnetic vector potential has dropped to 1 % of its maximum value. The axisymmetric model in is compared to an analytical model with good results.