A Novel Nondestructive, Noncontacting Method of Measuring the Depth of Thin Slits and Cracks in Metals

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Abstract
A novel method of measuring the depth of ultrathin deep slots in metal surfaces is presented. This method is a noncontacting nondestructive application of microwave theory and practice involving the degeneration of higher cylindrical eigenmodes to the fundamental mode. Theoretical and experimental considerations show a proportionality between the detected signal and the length-depth product. This method complements other procedures for measuring the depth of slots and cracks and provides a new and unique technique for measurement of very thin slots and cracks.

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