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23 July 1997 Hazardous cloud imaging: a new way of using passive IR
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A Modeling and Simulation study of the limits of remote detection by passive IR has led to a new concept for the remote detection of hazardous clouds. A passive IR signature model was developed using as input the ERDEC IR spectral data bases for chemicals and biologicals, and the atmospheric transmittance model MODTRAN (MODerate resolution TRANSmittance). The cloud travel and dispersion model VLSTRACK (Vapor, Liquid, and Solid TRACKing) was used to simulate chemical and biological clouds. An easily applied spectral discrimination technique was developed using Linear Programming. All of these were melded with MATHEMATICA to produce images of 3 threat clouds: Sarin, mustard and an unnamed biological. (For reasons of space only Sarin is discussed here.) The HAZCI (HAZarous Cloud Imager) is a unique configuration of a spatially scanning Fourier Transform IR on the same level of complexity as the M21, but capable of orders-of-magnitude greater sensitivity and moving operation. The concept provides for automatic detection and operator assisted discrimination for chemical clouds and biological clouds at ranges greater than 50 kms. Both chemical and biological clouds can generally be discriminated from other known battlefield contaminants and from all materials (including biologicals) that are uniformly distributed in the atmosphere; but, specific detection of pathogenic biologicals is not projected at this time.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dennis F. Flanigan "Hazardous cloud imaging: a new way of using passive IR", Proc. SPIE 3082, Electro-Optical Technology for Remote Chemical Detection and Identification II, (23 July 1997);

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