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Determination of Electrical Conductivity Profiles from Multi-Frequency Impedance Measurements

  • Stephen J. Norton
  • Arnold H. Kahn
  • Michael L. Mester
Chapter
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series

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.

Keywords

Secondary Coil Primary Coil Conductivity Profile Fringe Effect Eddy Current Method 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Reference

  1. 1.
    S. J. Norton, A. H. Kahn, and M. L. Mester, Research in Nondestructive Evaluation (in press).Google Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • Stephen J. Norton
    • 1
  • Arnold H. Kahn
    • 1
  • Michael L. Mester
    • 2
  1. 1.National Institute of Standards and TechnologyGaithersburgUSA
  2. 2.The Aluminum Association, Inc.USA

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