Finite element analysis for differential eddy current probe design of steam generator tubes

Eddy current non-destructive evaluation technique is one of the most useful electromagnetic methods for early detection of defects in critical nuclear components such as steam generator tubes, fuel rod and turbine disk, etc. For the better analysis of eddy current signal measured from experiment for awkward shape of defect, numerical modelling analysis is very important in understanding the physics of electromagnetic field/defect interactions. In this study, A two-dimensional magnetic vector potential finite element formation for the modeling of eddy current non-destructive evaluation phenomena is described. The technique is illustrated by predicting differential eddy current probe impedance plane trajectories for change of coil distance and coil size in PWR steam generator tubing