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

摘要

In this paper, a layering analysis scheme for reconstruction 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 accuracy. The shape profiles and conductivity of the crack are reconstructed 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 SCC. It is demonstrated that the new strategy is promising for the improvement of the sizing precision of SCC.