The paper deals with uncertainty in depth estimation of partially conductive cracks from eddy current testing signals. Numerical simulations are carried out to investigate influences of crack parameters on the response signals. Three parameters of the crack, i.e. its depth, width and conductivity are changed to simulate variety of possible scenarios. Standard pancake probe is used for the inspection at first. The presented numerical results confirm that the inverse problem is highly ill-posed when partially conductive cracks, as stress corrosion cracking, are concerned. Accordingly, a new approach in the response signal sensing is proposed. The idea is to pick-up more information provided by the eddy currents. Thus, three coils positioned perpendicularly to each other are employed to sense all the three spatial components of the perturbation electromagnetic field. The gained results reveal that it is possible to considerably decrease the uncertainty in depth estimation of partially conductive cracks by employing the proposed idea.
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