Near and far EMI field analyses in a conducting environment to enhance underwater UXO detection

Fridon Shubitidze; Ben Barrowes; Irma Shamatava; Juan Pablo Fernández; Kevin O'Neill

doi:10.1117/12.819059

4 May 2009 Near and far EMI field analyses in a conducting environment to enhance underwater UXO detection

Fridon Shubitidze, Ben Barrowes, Irma Shamatava, Juan Pablo Fernández, Kevin O'Neill

Proceedings Volume 7303, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XIV; 73030D (2009) https://doi.org/10.1117/12.819059
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

The underlying physics of low frequency EMI scattering phenomena in underwater environments from highly conducting and permeable metallic objects is analyzed using an approach that combines the method of auxiliary sources and a surface impedance boundary condition. The combined algorithm solves EMI boundary-value problems by representing the electromagnetic fields in each domain of the structure under investigation by a finite linear combination of analytical solutions of the relevant field equations, corresponding to elementary sources situated a small distance away from the boundaries of each domain. Numerical experiments are conducted for homogeneous and multilayer targets of canonical (spheroidal) shapes subject to frequency- or time-domain illumination, as well as for heterogeneous UXO like targets, to demonstrate: (a) how marine environments change EMI sensor performance and associated processing approaches for detecting highly conducting and permeable metallic objects underwater, and (b) what are the EMI sensors detectability limits. Near and far EMI field and induced eddy-current distributions are presented to help gain insight into underwater EMI scattering phenomena. Particularly, the results illustrate coupling effects between the object and its surrounding conductive medium, especially at high frequencies (early times for time-domain sensors). The results also suggest that this coupling depends on the object's material properties, the conductivity of the medium, and the distance between the sensor and the object's center.

Citation Download Citation

Fridon Shubitidze, Ben Barrowes, Irma Shamatava, Juan Pablo Fernández, and Kevin O'Neill "Near and far EMI field analyses in a conducting environment to enhance underwater UXO detection", Proc. SPIE 7303, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XIV, 73030D (4 May 2009); https://doi.org/10.1117/12.819059

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