Measurements of scene spectral radiance variability

Juliette A. Seeley; Edward C. Wack; Daniel L. Mooney; Michael Muldoon; Shen Shey; Carolyn A. Upham; John M. Harvey; Richard N. Czerwinski; Michael P. Jordan; Alexandre Vallières; Martin Chamberland

doi:10.1117/12.663793

19 May 2006 Measurements of scene spectral radiance variability

Juliette A. Seeley, Edward C. Wack, Daniel L. Mooney, Michael Muldoon, Shen Shey, Carolyn A. Upham, John M. Harvey, Richard N. Czerwinski, Michael P. Jordan, Alexandre Vallières, Martin Chamberland

Author Affiliations +

Proceedings Volume 6218, Chemical and Biological Sensing VII; 621807 (2006) https://doi.org/10.1117/12.663793
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States

Abstract

Detection performance of LWIR passive standoff chemical agent sensors is strongly influenced by various scene parameters, such as atmospheric conditions, temperature contrast, concentration-path length product (CL), agent absorption coefficient, and scene spectral variability. Although temperature contrast, CL, and agent absorption coefficient affect the detected signal in a predictable manner, fluctuations in background scene spectral radiance have less intuitive consequences. The spectral nature of the scene is not problematic in and of itself; instead it is spatial and temporal fluctuations in the scene spectral radiance that cannot be entirely corrected for with data processing. In addition, the consequence of such variability is a function of the spectral signature of the agent that is being detected and is thus different for each agent. To bracket the performance of background-limited (low sensor NEDN), passive standoff chemical sensors in the range of relevant conditions, assessment of real scene data is necessary¹. Currently, such data is not widely available². To begin to span the range of relevant scene conditions, we have acquired high fidelity scene spectral radiance measurements with a Telops FTIR imaging spectrometer³. We have acquired data in a variety of indoor and outdoor locations at different times of day and year. Some locations include indoor office environments, airports, urban and suburban scenes, waterways, and forest. We report agent-dependent clutter measurements for three of these backgrounds.

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Juliette A. Seeley, Edward C. Wack, Daniel L. Mooney, Michael Muldoon, Shen Shey, Carolyn A. Upham, John M. Harvey, Richard N. Czerwinski, Michael P. Jordan, Alexandre Vallières, and Martin Chamberland "Measurements of scene spectral radiance variability", Proc. SPIE 6218, Chemical and Biological Sensing VII, 621807 (19 May 2006); https://doi.org/10.1117/12.663793

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