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Proceedings Paper

A vector handheld frequency-domain sensor for UXO identification
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Paper Abstract

The GEM-3D+ sensor developed by Geophex, Ltd. is a new incarnation of their widely known GEM-3. The sensor provides the analyst with all three vector components of the secondary magnetic field over a wide range of frequencies. The GEM-3D+ features an innovative "beacon-based" positioning system that provides a full description of its location and orientation at every point without requiring any on-sensor hardware beyond an electronic compass. This enhances the usefulness of the instrument for dynamic surveying, This paper presents some methods and results related to UXO identification using the GEM-3D+. Our analyses exploit data provided by the sensor in both grid-based and dynamic measurements to characterize different objects, including metal spheres and actual UXO. For the data analysis we alternate between the dipole model and the more rigorous standardized excitation approach. We review some ill-conditioning issues encountered with the latter model and the different approaches that we use to overcome them. In applications, the availability of horizontal field components in the data allow us to identify UXO vs. non-UXO items while minimizing the nonnegligible effects of ground response.

Paper Details

Date Published: 4 May 2009
PDF: 12 pages
Proc. SPIE 7303, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XIV, 73030W (4 May 2009); doi: 10.1117/12.818812
Show Author Affiliations
Juan Pablo Fernández, Dartmouth College (United States)
Benjamin Barrowes, U.S. Army Engineer Research and Development Ctr. (United States)
Kevin O'Neill, Dartmouth College (United States)
U.S. Army Engineer Research and Development Ctr. (United States)
Irma Shamatava, Dartmouth College (United States)
Fridon Shubitidze, Dartmouth College (United States)

Published in SPIE Proceedings Vol. 7303:
Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XIV
Russell S. Harmon; J. Thomas Broach; John H. Holloway, Editor(s)

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