Analysis of geological soil effects on EMI responses relevant to UXO discrimination

Shubitidze, Fridon; O'Neill, Kevin; Shamatava, Irma; Sun, Keli; Paulsen, Keith

doi:doi:10.1117/12.603902

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Analysis of geological soil effects on EMI responses relevant to UXO discrimination

Proc. SPIE 5794, 296 (2005); http://dx.doi.org/10.1117/12.603902

Monday 28 March 2005

Orlando, FL, USA

Detection and Remediation Technologies for Mines and Minelike Targets X

Russell S. Harmon, J. Thomas Broach, John H. Holloway, Jr.

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Abstract

Fridon Shubitidze, Irma Shamatava, Keli Sun, and Keith Paulsen

Dartmouth College (USA)

Kevin O'Neill

Dartmouth College (USA) and USA ERDC Cold Regions Research and Engineering Lab. (USA)

Electromagnetic induction (EMI) sensing of a highly conducting and permeable metallic object buried inside a permeable medium is studied. The numerical technique is based on the method of auxiliary sources (MAS) and combined MAS/ thin skin depth approximation (MAS/TSA). The effect of the air/soil interface is accounted for via image theory, tailored for the quasi-magnetostatic case. First, the electromagnetic field inside a permeable medium originating from a state of the art EMI sensor is modeled using image theory. Image theory is then expanded to treat multi-layered cases. An analytical expression is derived for determining a half space magnetic permeability from EMI data, and is applied to measured data. The MAS/TSA is used for solving the full EMI scattering problem for a heterogeneous, highly conducting and permeable metallic object in a permeable medium. Several numerical examples are designed to show how the geological soil"s magnetic permeability can affect the signal from a buried metallic object.

History

Online Jul 08, 2005

Digital Object Identifier

http://dx.doi.org/10.1117/12.603902

Citation

Fridon Shubitidze, Kevin O'Neill, Irma Shamatava, Keli Sun and Keith Paulsen, "Analysis of geological soil effects on EMI responses relevant to UXO discrimination", Proc. SPIE 5794, 296 (2005); http://dx.doi.org/10.1117/12.603902