Expected Challenge Levels for Chemical Vapor Standoff Sensing

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Authors
  1. Yee, E.
Corporate Authors
Defence Research and Development Canada, Suffield Research Centre, Ralston AB (CAN)
Abstract
In this report, challenge levels in the form of path-integrated concentrations (relevant for the assessment of standoff chemical detection performance) and in the form of partial dosages (relevant for the assessment of human exposure) have been computed and documented for three different atmospheric conditions: namely, for a moderately unstable atmospheric stratification, for a near neutral atmospheric stratification, and for a moderately stable atmospheric stratification. A model for mapping the path-integrated concentration in a toxic agent cloud into the differential spectral radiance observed by a passive Fourier-transform infrared spectrometer (applied as a standoff chemical detector) is obtained. Using the challenge levels and this model, a systematic procedure for addressing the following question is provided: can a toxic agent vapour cloud be detected by the standoff chemical detector to provide sufficient advanced warning to permit the donning of protective equipment before the exposure exceeds some critical threshold as to result in some deleterious effect on exposed personnel (co-located with the detector)? A detailed example illustrating the application of this procedure is provided.

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Keywords
modeling simulation;atmospheric dispersion;consequence assessment;standoff detection performance
Report Number
DRDC-RDDC-2016-R044 — Scientific Report
Date of publication
01 Apr 2016
Number of Pages
38
DSTKIM No
CA042514
CANDIS No
803719
Format(s):
Electronic Document(PDF)

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