Characterization of aerosol-containing chemical simulant clouds using a sensitive, thermal infrared imaging spectrometer

Jeffrey L. Hall; Francis M. D'Amico; Steven J. Kolodzey; Jun Qian; Mark L. Polak; Karl Westerberg; Clement S. Chang

doi:10.1117/12.884238

3 June 2011 Characterization of aerosol-containing chemical simulant clouds using a sensitive, thermal infrared imaging spectrometer

Jeffrey L. Hall, Francis M. D'Amico, Steven J. Kolodzey, Jun Qian, Mark L. Polak, Karl Westerberg, Clement S. Chang

Author Affiliations +

Proceedings Volume 8018, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XII; 801816 (2011) https://doi.org/10.1117/12.884238
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

A sensitive, ground-based thermal imaging spectrometer was deployed at the Army's Dugway Proving Ground to remotely monitor explosively released chemical-warfare-agent-simulant clouds from stand-off ranges of a few kilometers. The sensor has 128 spectral bands covering the 7.6 to 13.5 micron region. The measured cloud spectra clearly showed scattering of high-elevation-angle sky radiance by liquid aerosols or dust in the clouds: we present arguments that show why the scattering is most likely due to dust. This observation has significant implications for early detection of dust-laden chemical clouds. On one hand, detection algorithms must properly account for the scattered radiation component, which would include out-of-scene radiation components as well as a dust signature; on the other hand, this scattering gives rise to an enhanced "delta-T" for detection by a ground-based sensor.

Citation Download Citation

Jeffrey L. Hall, Francis M. D'Amico, Steven J. Kolodzey, Jun Qian, Mark L. Polak, Karl Westerberg, and Clement S. Chang "Characterization of aerosol-containing chemical simulant clouds using a sensitive, thermal infrared imaging spectrometer", Proc. SPIE 8018, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XII, 801816 (3 June 2011); https://doi.org/10.1117/12.884238

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