Perturbation Theory Approach for the Impedance of an Air-core Coil Over a Surface-Breaking Flaw
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
Eddy-current air-core coils are widely used to detect surface flaws and to measure properties of the surface layers. The technique consists of measuring the impedance of the coil over a homogeneous half-space and then over a half-space with the flaw or the surface layer at various frequencies and for positions of the coil, and then inferring the properties of the flaw or the surface layer from the difference in the impedance. A crucial part of this process is the ability to solve the forward problem, i.e., computing the impedance when the properties of the flaw or the layer are given.