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A research program involving two applications of tunable infrared laser differential absorption spectroscopy (TILDAS) with multipass, long-path absorption cells to the detection of explosives contamination in soils is reported. In the first application, sensitive, specific real-time species concentration measurements by TILDAS have led to new understanding of the processes involved in explosives detection by the heating of contaminated soils and the quantification of the resulting pyrolysis gases. In the second, we present results of our calculations of the properties of astigmatic off-axis resonator absorption cells, which show that useful TILDAS path lengths can be achieved inside a cone penetrometer probe.

ABSTRACT:The primary technical objective of this demonstration project was to evaluate the detection and discrimination capabilities (including production rates and costs) of advanced UXO systems in difficult magnetic clutter environments such as those encountered at Kaho'olawe, Hawaii. One 90-m by 111.1-m (1-hectare) area and 10 (not necessarily contiguous) 30-m by 30-m test grids within the Kaho'olawe Quality Assurance (QA) Range were prepared to present a limited range of target/clutter/ topography/vegetation/magnetic background conditions to the various demonstrators' systems: Geonics EM-63, GTL TM-5 EMU, Geophex GEM-3, NRL EMMS, and Geonics EM-61. Anomaly maps, survey maps, and demonstrators target discrimination charts are compared to actual groundtruth to determine performance assessment of detection, discrimination, and false alarm rate. At Kaho'olawe, the advanced EMI systems did not demonstrate significant performance and/or cost improvements over the baseline technology consisting of a standard EM-61 system operated in an "EM and Flag" mode. This was not true at Jefferson Proving Ground, Indiana (July 2000). Finally, the safety and logistics problems associated with conducting technology demonstrations concurrent with actual UXO cleanup operations proved to be a very inefficient, costly, and time-consuming process. DISCLAIMER:The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. ContentsPreface xii