Calibration of a Finite Element Forward Model in Eddy Current Inspection

We report on the use of a novel constrained optimisation algorithm for calibrating finite element model in an eddy current inspection application. An accurate forward is often important such applications training neural networks or as part iterative solver. However, subject calibration has not received much attention literature to date. consider multi-frequency, depth profiling application, which non-destructive testing nuclear industry. In algorithm, we Levenberg-Marquardt and bisection search ensure constraints are satisfied, coupled with truncated Gradient Hessian method. calibrate two types models, one using filament representation coils other full 3D approach. The results show feasibility non-linear tuning parameters. mean signal-noise ratio after spectrum was 29.47 dB 28.96 filament; contrast SNR measured coil parameters 1.48 4.98 uncalibrated respectively. that competitive (within graphite application); therefore, computationally faster can be used minimal effect accuracy.