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

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.

Paper Details

Date Published: 10 June 2005
PDF: 12 pages
Proc. SPIE 5794, Detection and Remediation Technologies for Mines and Minelike Targets X, (10 June 2005); doi: 10.1117/12.603902
Show Author Affiliations
Fridon Shubitidze, Dartmouth College (United States)
Kevin O'Neill, Dartmouth College (United States)
USA ERDC Cold Regions Research and Engineering Lab. (United States)
Irma Shamatava, Dartmouth College (United States)
Keli Sun, Dartmouth College (United States)
Keith Paulsen, Dartmouth College (United States)

Published in SPIE Proceedings Vol. 5794:
Detection and Remediation Technologies for Mines and Minelike Targets X
Russell S. Harmon; J. Thomas Broach; John H. Holloway, Editor(s)

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