Inversion of frequency domain data collected in a magnetic setting for the detection of UXO

Lhomme, Nicolas; Pasion, Leonard R.; Billings, Stephen D.; Oldenburg, Douglas W.

doi:doi:10.1117/12.780153

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Proceedings / Volume 6953 / GPR for Detection and Algorithm Fusion II

Inversion of frequency domain data collected in a magnetic setting for the detection of UXO

Proc. SPIE 6953, 69531I (2008); http://dx.doi.org/10.1117/12.780153

Monday 17 March 2008

Orlando, FL, USA

Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XIII

Russell S. Harmon, John H. Holloway, Jr., J. Thomas Broach

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Abstract

References (16)

Nicolas Lhomme and Leonard R. Pasion

Sky Research, Inc. (Canada) and Univ. of British Columbia (Canada)

Stephen D. Billings

Sky Research, Inc. (Canada)

Douglas W. Oldenburg

Univ. of British Columbia (Canada)

Magnetic soils are a major source of false positives when searching for landmines or unexploded ordnance (UXO) with electromagnetic induction sensors. The viscosity effects of magnetic soil can be accurately modeled by assuming a ferrite relaxation with a log-uniform distribution of time constants. The frequency domain response of ferrite soils has a characteristic negative log-linear in-phase and constant quadrature component. After testing and validating that assumption, we process frequency domain electromagnetic data collected over UXO buried in a viscous remanent magnetic host. The first step is to estimate a spatially smooth background magnetic susceptibility model from the sensor. The response of the magnetically susceptibility background is then subtracted from the sensor data. The background removed data are then inverted to obtain estimates of the dipole polarization tensor. This technique is demonstrated for the discrimination of UXO with hand-held Geophex GEM3 data collected at a contaminated site near Denver, Colorado.

History

Online Apr 14, 2008

Digital Object Identifier

http://dx.doi.org/10.1117/12.780153

Citation

Nicolas Lhomme, Leonard R. Pasion, Stephen D. Billings and Douglas W. Oldenburg, "Inversion of frequency domain data collected in a magnetic setting for the detection of UXO", Proc. SPIE 6953, 69531I (2008); http://dx.doi.org/10.1117/12.780153