Abstract
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).
Original language | English (US) |
---|---|
Pages (from-to) | 1206-1213 |
Number of pages | 8 |
Journal | IEEE Transactions on Geoscience and Remote Sensing |
Volume | 39 |
Issue number | 6 |
DOIs | |
State | Published - Jun 1 2001 |
Externally published | Yes |