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An important aim of nondestructive evaluation is to quantify flaws in components using sensor measurements. In pursuit of this aim, a method has been developed for finding the size and shape of planar cracks in electrical conductors from single-frequency eddy-current probe impedance measurements. In the direct problem, the change in the impedance of an eddycurrent probe due to a crack in a conductor is determined in the regime where the skin depth is much smaller than the dimensions of thedoi:10.1088/0266-5611/18/6/327 fatcat:scu35rnbynf4xas4eigwstljrm