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Characterizing Surface-breaking Cracks through Eddy Current NDE and Model-based Inversion

Initial results for model-based inversion of eddy current flaw response data are presented as an alternative or supplement to amplitude-based sizing. The approach provides an estimation of the flaw dimensions (length, depth, and width) and orientation that are independent of amplitudes and assumptions from a probability of detection (POD) analysis. The effects of probe construction characteristics on eddy current signals are consid-ered. The inversion method performs well over a range of intermediate flaw sizes and orientations, representing an improvement for flaws that are dissimilar from those used in an amplitude-based POD model. Future research directions to improve inversion estimates associated with greater uncer-tainty are discussed.

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