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Proceedings Paper

Electromagnetic characteristics of Cambodian soil: implication for land mine detection in soil containing ferromagnetic minerals
Author(s): John Katsube; Rod Klassen; Yogadhish Das; Keith Benn; Mel Best; Richard Ernst
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Paper Abstract

Electromagnetic (EM: Magnetic Susceptibility [MS], Electrical Conductivity) and soil texture characteristics were determined for a Cambodian soil from an area where landmine detection interference has been experienced. The purpose was to collect information for developing techniques to discriminate between EM signals from small metallic particles in landmines and from iron-oxides or ferromagnetic mineral grains in soil. Ferromagnetic minerals are iron-oxides with strong MS characteristics. Results indicate that this soil consisted of four textural components: clasts (2-10 mm), medium-coarse-sand (<2.0 mm), fine-sand (<0.25 mm) and clay-silt (<0.063 mm). The coarse-sand had high MS values (~550x10-8 SI/kg) due to high ferromagnetic mineral content (~20 wt.%). Some large rounded clasts, however, had considerably higher MS values (~11000x10-8 SI/kg) due to high ferromagnetic mineral concentrations (30-60 wt.%), a likely source of significant landmine detection interference. The finer components had smaller MS values and iron-oxide contents. Complex electrical conductivity (1-106 Hz) of iron-oxides showed significant frequency dependence due to capacitance effects of electrochemical double layers on their surfaces in contact with soil moisture. This frequency dependence of iron-oxides may provide opportunities for potential EM system's design to discriminate between soil and landmine responses.

Paper Details

Date Published: 13 August 2002
PDF: 15 pages
Proc. SPIE 4742, Detection and Remediation Technologies for Mines and Minelike Targets VII, (13 August 2002);
Show Author Affiliations
John Katsube, Geological Survey of Canada (Canada)
Rod Klassen, Geological Survey of Canada (Canada)
Yogadhish Das, Defence Research Establishment Suffield (Canada)
Keith Benn, Univ. of Ottawa (Canada)
Mel Best, Bemex Consulting International (Canada)
Richard Ernst, Geological Survey of Canada (Canada)

Published in SPIE Proceedings Vol. 4742:
Detection and Remediation Technologies for Mines and Minelike Targets VII
J. Thomas Broach; Russell S Harmon; Gerald J. Dobeck, Editor(s)

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