Inversion of Eddy Current Data for Conductive Films and Coatings Thickness and Conductivity Measurement

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1997
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de Halleux, B.
Ptchelintsev, A.
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Review of Progress in Quantitative Nondestructive Evaluation
Center for Nondestructive Evaluation

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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Eddy current testing is currently used to determine the physical characteristics of a conductive specimen and to detect defects by measurements of electrical impedance of an eddy current probe. In this study we developed two systems of coils allowing to determine properties of conductive coatings and foils. A probe contained two plane rectangular coils connected in series and separated by a fixed distance. A coated plate or a foil was placed between the coils and the coil impedance was measured using a digital impedancemeter. The discussed probe had a large length-to-width ratio and was modeled using the simple two-conductor line model, which express solutions in terms of the integrals containing no Bessel but, only common trigonometric functions, which considerably reduces the inversion time. The method allows reproducible measurements on coated conductive sheets. Aluminum 15–45 μm layers have been measured on steel and stainless steel substrates.

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Wed Jan 01 00:00:00 UTC 1997