Coupling Between Highly Conducting and Permeable Metallic Objects in the EMI Frequency Range
Keywords:
UXO, Low frequency, Electromagnetic induction, Auxiliary sources, Interaction, multiple, scatteringAbstract
Electromagnetic induction (EMI) sensing, from 10's of Hz
up to 100's of kHz, is emerging as one of the most promising remote
sensing technologies for detection and discrimination of buried
metallic objects, particularly unexploded ordinance (UXO). For a
single homogenous target it has been shown that the scattered EMI
signal strongly depends on an object's geometry and its
electromagnetic parameters. Most if not all UXO contain different
kinds of metal. Additionally, UXO sites are often highly
contaminated with metallic clutter. Methods are currently needed to
distinguish dangerous objects, such as UXO, from innocuous clutter.
Recently, analysis of broadband EMI responses from multiple objects
has demonstrated significant interaction between them. The main
goal of the paper is to investigate interaction phenomena between
highly conducting and permeable metallic objects in the EMI
frequency range. Numerical results are compared with experimental
data for canonical geometries (spheres and cylinders). The results
indicate when and how interaction affects the EMI responses and
provides guidance for use of this understanding for future target
discrimination purposes.
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References
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