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Proceedings Paper

The magnetic polarizability of thin shells
Author(s): Jonathan E. Gabbay; Waymond R. Scott Jr.
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Paper Abstract

The ability to detect and dispose of buried mines requires effective means by which to discriminate between hazardous targets and benign clutter. In that regard, wide-band electromagnetic induction (EMI) sensors have shown significant promise in their ability to classify buried metallic objects based on their response to illumination by a time-varying magnetic field. A target's scattered response may be expressed compactly in its magnetic polarizability dyadic, a form that describes the reaction of the scatterer to an arbitrary magnetic field. More specifically, a singularity expansion of the polarizability dyadic has been shown to allow for robust target discrimination. Eddy currents in a 2D surface may be expressed using a scalar stream function, an approach which is powerful since the solenoidality of the current density is enforced trivially. Using this formulation, it is possible to arrive at a modal eigenvalue expansion for the magnetic polarizability that is in the form of the singularity expansion.

Paper Details

Date Published: 29 May 2014
PDF: 9 pages
Proc. SPIE 9072, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XIX, 90720B (29 May 2014); doi: 10.1117/12.2050449
Show Author Affiliations
Jonathan E. Gabbay, Georgia Institute of Technology (United States)
Waymond R. Scott Jr., Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 9072:
Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XIX
Steven S. Bishop; Jason C. Isaacs, Editor(s)

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