The magnetic polarizability of thin shells

Jonathan E. Gabbay; Waymond R. Scott Jr.

doi:10.1117/12.2050449

29 May 2014 The magnetic polarizability of thin shells

Jonathan E. Gabbay, Waymond R. Scott Jr.

Proceedings Volume 9072, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XIX; 90720B (2014) https://doi.org/10.1117/12.2050449
Event: SPIE Defense + Security, 2014, Baltimore, MD, United States

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.

Citation Download Citation

Jonathan E. Gabbay and Waymond R. Scott Jr. "The magnetic polarizability of thin shells", Proc. SPIE 9072, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XIX, 90720B (29 May 2014); https://doi.org/10.1117/12.2050449

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