A multi-frequency strategy for reconstruction of deep stress corrosion cracks from ECT signals at multiple liftoffs

Abstract

In this paper, a layering analysis scheme for reconstructio n of deep Stress Corrosion Cracks (SCC) from ECT signals is proposed based on a strategy of multiple frequency excitation and multiple liftoff in order to improve the sizing accu racy. The shape profiles and conductivity of the crack are reconstr ucted respectively using a hybrid inversion scheme. The profiles of several cracks are reconstructed from simulated signals of conductive notches and measured signals of an artificial S CC. It is demonstrated that the new strategy is promising for the improvement of the sizing precision of SCC.