Abstract
A general expression is derived for the change in coil impedance due to a through-crack in a conducting plate when the plate thickness (h) is small compared with the skin-depth ( delta ). Theoretical calculations are presented for the specific case of a circular air-cored coil and crack which is much longer than the coil diameter. These results are compared with experimental measurements of the coil impedance as a function of frequency and coil translation relative to the crack. The thin-plate theory is found to be in good agreement with experiment (i.e. within approximately 10%) for values of h/ delta up to 0.12.
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