Radiative Transfer And 4.3µm Atmospheric Clutter Observations

C. M. Randall; L. T. Greenberg

doi:10.1117/12.932676

31 March 1982 Radiative Transfer And 4.3µm Atmospheric Clutter Observations

C. M. Randall, L. T. Greenberg

Proceedings Volume 0304, Modern Utilization of Infrared Technology VII; (1982) https://doi.org/10.1117/12.932676
Event: 25th Annual Technical Symposium, 1981, San Diego, United States

Abstract

Detailed line-by-line computations have been made to assess the utility of balloon-borne sensors for determining the backgrounds that will be encountered by space-based 4.3µm surveillance systems. In this spectral region, the atmosphere becomes opaque at the CO2 line centers in a short distance everywhere in the atmosphere below an altitude of 100 km, whereas the atmosphere is quite transparent between lines down to around 25 km altitude. Thus radiation intercepted by a space-based sensor with a spectral bandwidth greater than a few Doppler line widths will originate from a variety of levels in the atmosphere, where the physical mechanisms leading to background variations or clutter may be quite different. Our calculations indicate that down-looking measurements from 30 km (a typical balloon altitude) will adequately determine the clutter originating below the balloon. On the other hand, the determination of clutter above the balloon by an up-looking sensor will be much more uncertain because radiation from this region will reach space with less attenuation than it will experience traveling down to the balloon. Quantitative results representative of various spectral locations in the 4.3-μm band of CO2 will be presented.

Citation Download Citation

C. M. Randall and L. T. Greenberg "Radiative Transfer And 4.3µm Atmospheric Clutter Observations", Proc. SPIE 0304, Modern Utilization of Infrared Technology VII, (31 March 1982); https://doi.org/10.1117/12.932676

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