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

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

doi:10.1117/12.603902

10 June 2005 Analysis of geological soil effects on EMI responses relevant to UXO discrimination

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

Proceedings Volume 5794, Detection and Remediation Technologies for Mines and Minelike Targets X; (2005) https://doi.org/10.1117/12.603902
Event: Defense and Security, 2005, Orlando, Florida, United States

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.

Citation Download 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, Detection and Remediation Technologies for Mines and Minelike Targets X, (10 June 2005); https://doi.org/10.1117/12.603902

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