Abstract
It is generally accepted that electromagnetic disturbances diffuse into the bulk region of highly conducting media instead of propagating with wave-like characteristics [1]. This can be explained based on the fact that the high frequency components of the electromagnetic field decay rapidly, leaving the electromagnetic state in the bulk material quasistatic. For the application of this phenomena to practical testing, Ross et al. developed a formalism describing the diffusion of electromagnetic field in a finite thickness conductor and demonstrated the effect of thickness on the time rate of damping of field amplitude [2].
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References
See, for example, W. R. Smythe, Static and Dynamic Electricity, 3rd edition (Hemisphere Publishing, 1989).
K. H. Cavcey, Mat. Eval. Vol. 47, 216 (1989).
M. Gibbs and J. Campbell, Mat. Eval., Jan., 51 (1991).
S. Ross, M. Lusk and W. Lord, IEEE Trans. Magn. Vol. 32, 535 (1996).
K. F. Graff, Wave Motion in Elastic Solids (Dover Publications Inc., New York, 1991).
E. Butkov, Mathematical Physics (Addison-Wesley, Reading Massachusetts, 1968).
It can be readily shown that the average field energy is predominantly magnetic in a good conductor. See Ref. 1.
Ziman, Principle of the Theory of Solids (Cambridge University Press, New York, 1972).
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© 1998 Plenum Press, New York
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Namkung, M., Wincheski, B., Fulton, J.P., Nath, S. (1998). Theoretical Aspects of Transient Electromagnetic Field in Finite Sized Conducting Media. In: Thompson, D.O., Chimenti, D.E. (eds) Review of Progress in Quantitative Nondestructive Evaluation. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5339-7_34
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DOI: https://doi.org/10.1007/978-1-4615-5339-7_34
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