Transient Electromagnetic Fields in Highly Conductive Media

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1999
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Namkung, Min
Wincheski, Buzz
Nath, S.
Fulton, J.
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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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It can be readily demonstrated that the spatial and time dependences of an electromagnetic field in highly conductive media are governed by the diffusion equation [1, 2, 3]. It can be also easily shown that this equation is satisfied by the damped wave solutions having a complex wave vector causing attenuation over distance [1, 2, 4]. Such is basically a fact that can be intuitively predicted; the amplitude of an electromagnetic field with time and spatial harmonics entering a good conductor attenuates rapidly due to eddy current loss while its phase at a given location changes in time as the field advances. To make this picture valid, one must prove that measurable field amplitude exists after the wave front has traveled a sufficient distance. In case of pulsed eddy current test this distance is usually twice the specimen thickness.

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Fri Jan 01 00:00:00 UTC 1999