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Proceedings Paper

Electromagnetic induction spectroscopy for detecting and identifying buried objects
Author(s): Dean A. Keiswetter; I. J. Won; Jonathan M. Miller; Thomas H. Bell; Ernesto R. Cespedes; Kevin O'Neill
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Paper Abstract

An object, made partly or wholly of metals, has a distinct combination of electrical conductivity, magnetic permeability, and geometrical shape and size. When the object is exposed to a low-frequency electromagnetic field, it produces a secondary magnetic field. By measuring the broadband spectrum of the secondary field, we obtain a district spectral signature that may uniquely identify the object. Based on the response spectrum, we attempt to 'fingerprint' the object. This is the basic concept of EMIS. From numerous surveys that we have conducted using our multifrequency electromagnetic sensors (GEM-2 and GEM-3), we have accumulated significant evidence that a metallic object undergoes continuous changes in response as the transmitter frequency changes. These observations made over may UXO targets suggest strongly that the EMI anomaly measured in a broad band offers an ability to both detect and identify a target. The frequency-dependent structure of the difference was also reproducible and consisting over a range of depths. Therefore, we have established that the FEM-3 is capable of delivering broadband EMI data with ample target-specific information content for the purpose of target classification and identification.

Paper Details

Date Published: 22 August 2000
PDF: 10 pages
Proc. SPIE 4038, Detection and Remediation Technologies for Mines and Minelike Targets V, (22 August 2000); doi: 10.1117/12.396184
Show Author Affiliations
Dean A. Keiswetter, Geophex, Ltd. (United States)
I. J. Won, Geophex, Ltd. (United States)
Jonathan M. Miller, Arete Engineering Technologies Corp. (United States)
Thomas H. Bell, Arete Engineering Technologies Corp. (United States)
Ernesto R. Cespedes, U.S. Army Engineer Research and Development Ctr. (United States)
Kevin O'Neill, U.S. Army Cold Regions Research & Engineering Lab. (United States)

Published in SPIE Proceedings Vol. 4038:
Detection and Remediation Technologies for Mines and Minelike Targets V
Abinash C. Dubey; James F. Harvey; J. Thomas Broach; Regina E. Dugan, Editor(s)

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