Characteristics of electromagnetic pulse propagation in metal

Namkung, M.; Wincheski, B.; Nath, S.; Fulton, J. P.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p409
Academic Journal
Numerical simulations have shown that a packet of electromagnetic waves advancing in a highly conductive medium suffers severe dispersion which smears the peak position, a potential problem for pulsed eddy current experiments. It was also clear from the previous simulation results that shifting the entire frequency spectrum by an amount sufficient to suppress the low frequency components would improve the situation. Hence, for the present study, a numerical simulation was performed on the characteristics of wave packets with a carrier frequency component. The results show a clear improvement in the sharpness of the peak position and the overall propagation rate is seen to be an increasing function of &Vpgr;[sub o], the carrier frequency. Experiments were performed in a through-transmission mode and the initial results appear to be consistent with that of numerical simulation. This paper presents the details of numerical simulation performed with varying carrier frequency, and conductivity and thickness of the medium. Also presented are the initial experimental results obtained with aluminum plates of varying thickness showing the carrier frequency dependence of propagation rate. The numerical and experimental results are closely compared and analyzed to extract the characteristic elements consistent with two different field propagation mechanisms. © 2000 American Institute of Physics.


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