On the wideband EMI response of a rotationally symmetric permeable and conducting target

A simple and accurate model is presented for computation of the electromagnetic induction (EMI) resonant frequencies of canonical conducting and ferrous targets, in particular, finite-length cylinders and rings. The imaginary resonant frequencies correspond to the well known exponential decay consta...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2001-06, Vol.39 (6), p.1206-1213
Main Authors: Carin, L., Haitao Yu, Dalichaouch, Y., Perry, A.R., Czipott, P.V., Baum, C.E.
Format: Article
Language:English
Subjects:
Computation
Conduction
Conductivity
Cylinders
Electromagnetic induction
Electromagnetic interference
Magnetic moments
Magnetic resonance
Magnetic resonance imaging
Magnetization
Mathematical models
Resonant frequencies
Resonant frequency
Tensile stress
Time domain analysis
Wideband
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Summary:A simple and accurate model is presented for computation of the electromagnetic induction (EMI) resonant frequencies of canonical conducting and ferrous targets, in particular, finite-length cylinders and rings. The imaginary resonant frequencies correspond to the well known exponential decay constants of interest for time-domain EMI interaction with conducting and ferrous targets. The results of the simple model are compared to data computed numerically, via method-of-moments (MoM) and finite-element models. Moreover, the simple model is used to fit measured wideband EMI data from ferrous cylindrical targets (in terms of a small number of parameters). It is also demonstrated that the general model for the magnetic-dipole magnetization, in terms of a frequency-dependent diagonal dyadic, is applicable to general rotationally symmetric targets (not just cylinders and rings).
ISSN:0196-2892
1558-0644
DOI:10.1109/36.927442