Magnetic models of unexploded ordnance

Magnetometry is widely used for the characterization of areas contaminated by unexploded ordnance (UXO). To successfully discriminate hazardous UXO from nonhazardous clutter requires accurate models of the ordnance response. This paper develops an ordnance library with 15 different items using total...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2006-08, Vol.44 (8), p.2115-2124
Main Authors: Billings, S.D., Pasion, C., Walker, S., Beran, L.
Format: Article
Language:English
Subjects:
Applied geophysics
Classification
discrimination
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Estimates
Exact sciences and technology
Geophysical measurements
Horizontal
Internal geophysics
inversion
Magnetic field measurement
Magnetic fields
Magnetic noise
magnetics
Magnetostatics
Mathematical analysis
Noise
Ordnance
Pollution measurement
Pollution, environment geology
Remanence
Research and development
Sea measurements
Solid modeling
Test stands
Testing
Unexploded ordnance
unexploded ordnance (UXO)
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Summary:Magnetometry is widely used for the characterization of areas contaminated by unexploded ordnance (UXO). To successfully discriminate hazardous UXO from nonhazardous clutter requires accurate models of the ordnance response. This paper develops an ordnance library with 15 different items using total-field magnetic data collected over a test stand. The induced and remanent magnetizations were obtained by varying the three-dimensional orientation of each item and measuring the magnetic field on a horizontal plane in the dipolar regime. Replicate measurements using multiple specimens of the same ordnance returned very similar induced magnetizations. The fitted moments were used to estimate the detection depths for different sensor noise floors. A prolate spheroid with a 3.5 aspect ratio was used to provide a good approximation to the detection depths for many of the ordnance items. Assuming a 1-nT noise floor, these orientation-dependent detection depths ranged from 10 to 17 times of the object's diameter
ISSN:0196-2892
1558-0644
DOI:10.1109/TGRS.2006.872905