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10 May 2012 Large loop EMI sensor for detection of deeply buried munitions in magnetic soils
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This paper presents an active source Electromagnetic Induction (EMI) sensor that offers extended detection ranges (> 2m) with minimal sensitivity to magnetic geology. The Ultra Deep Search (ULTRA) EMI system employs a large (20 - 40m), stationary, surface-laid transmitter loop that produces a relatively uniform magnetic field within the search region. This primary field decays slowly with depth due to the non-dipolar nature of the field within the search volume. An array of 3-axis receiver cubes measures the time derivative of secondary field decays produced by subsurface metallic objects. The large-loop transmitter combined with the vector sensing induction coil receivers produces a deep search capability that remains robust in environments containing highly magnetic soils. In this paper, we assess the general detection capabilities of the ULTRA system and present data collected over a set of standardized UXO targets. Additionally, we evaluate the potential for target feature extraction through dipole fit analysis of several data sets.
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Jonathan S. Miller, Stephen Billings, Joe Keranen, Gregory Schultz, and Chet Bassani "Large loop EMI sensor for detection of deeply buried munitions in magnetic soils", Proc. SPIE 8357, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XVII, 835707 (10 May 2012);

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