Determination of Electrical Conductivity Profiles from Multi-Frequency Impedance Measurements
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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
Most existing eddy current methods implicitly assume uniform electrical conductivity throughout the sample. However, eddy current measurements recorded over a range of frequencies extract conductivity information over a range of depths, and, thus, are sensitive to spatial variations in conductivity. Determination of spatial profiles of conductivity offers the potential of a new technique in metals processing, where variations in conductivity may arise in composite materials or from non-uniform temperature distributions. We describe here a conductivity profiling method based on an iterative nonlinear least-squares algorithm that operates on multi-frequency impedance data.