Subsurface discrimination using electromagnetic induction sensors

This paper reviews the problem of subsurface discrimination using electromagnetic induction (EMI) sensors. Typically, discrimination is based on differences in the multiaxis magnetic polarizability between different objects. They review work on frequency and time domain systems, and their interrelat...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2001-06, Vol.39 (6), p.1286-1293
Main Authors: Bell, T.H., Barrow, B.J., Miller, J.T.
Format: Article
Language:English
Subjects:
Coils
Conducting materials
Discrimination
Eddy currents
Eigenvalues
Eigenvalues and eigenfunctions
Electromagnetic induction
Electromagnetic interference
Electromagnetic measurements
Electromagnetic wave polarization
Inert
Magnetic domains
Magnetic sensors
Multiaxis
Ordnance
Sensors
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Summary:This paper reviews the problem of subsurface discrimination using electromagnetic induction (EMI) sensors. Typically, discrimination is based on differences in the multiaxis magnetic polarizability between different objects. They review work on frequency and time domain systems, and their interrelationship. They present the results of comprehensive measurements of the multiaxis EMI response of a variety of inert ordnance items, ordnance fragments, and scrap metal pieces recovered from firing ranges. The extent to which the distributions of the eigenvalues of magnetic polarizability for the different classes of objects do not overlap establishes an upper bound on discrimination. For various reasons, the eigenvalues cannot always be accurately determined using data collected above a buried target. This tends to increase the overlap of the distributions, and hence degrade discrimination performance.
ISSN:0196-2892
1558-0644
DOI:10.1109/36.927451