Abstract
This paper considers the problems of thin-skin surface currents applied to conducting plates that have through holes or through cracks in them. The surface field distributions depend on the parameter
m
═ (
μ
0
/
μ
) (
l
/
δ
), where
μ
0
/
μ
is the ratio of the free space to the specimen magnetic permeability and
l
/
δ
is the ratio of the flaw length dimension
l
to the skin depth
δ
. When
m
is small the fields are surface Laplacian distributions that can be computed by using methods of conformal mapping. The paper gives these distributions for circular holes and through cracks. Experiments are described for both these geometries, which confirm the incident and the leakage field distributions calculated for the two faces of the plate.
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