Physics of Scrap Discrimination
Abstract
This effort has achieved its objective of evaluating the feasibility of near-field-physics as a means of discriminating against shallow scrap, in magnetic UXO investigations. In addition, and unexpectedly, the near-field character of UXO has been identified as also being useful for discriminating among different UXO. Modeling the full 3D geometrical complexity of an 80-mm projectile, 155-mm projectile, and 2 pieces of irregular scrap provided the theoretical magnetostatic data required to perform the evaluation of near-field contributions to the total fields of these targets. Removal of the dipole field component was accomplished by fitting a standard prolate spheroidal model to the data, and subtracting the resulting field. Residual fields were evaluated to determine if the non-dipole components are: measurable, of distinctive signature, enhanced in the scrap relative to the UXO, and robust to typical noise sources. Additionally, practical sampling considerations for these fields were investigated to permit field collection and validation of the numerical results. Finally, field data were collected and analyzed to validate the numerical results.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 24, 2004
- Accession Number
- ADA438471
Entities
People
- D. A. Lieblich