13 August 2002 Electromagnetic characteristics of Cambodian soil: implication for land mine detection in soil containing ferromagnetic minerals
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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.
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John Katsube, John Katsube, Rod Klassen, Rod Klassen, Yogadhish Das, Yogadhish Das, Keith Benn, Keith Benn, Mel Best, Mel Best, Richard Ernst, Richard Ernst, } "Electromagnetic characteristics of Cambodian soil: implication for land mine detection in soil containing ferromagnetic minerals", Proc. SPIE 4742, Detection and Remediation Technologies for Mines and Minelike Targets VII, (13 August 2002); doi: 10.1117/12.479155; https://doi.org/10.1117/12.479155
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