A Study of the Leakage of Surface Electromagnetic Fields Through Holes and Cracks in Metal Plates

Details A Study of the Leakage of Surface Electromagnetic Fields Through Holes and Cracks in Metal Plates A Study of the Leakage of Surface Electromagnetic Fields Through Holes and Cracks in Metal Plates

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989rspsa.421...55m&link_type=abstract

Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 421, Issue 1860, pp. 55-78

Physics

2

Scientific paper

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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