17 October 1994 Technique for active measurement of atmospheric transmittance using an imaging system: implementation at 10.6-μm wavelength
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Abstract
An active method is presented for measuring atmospheric transmittance with an imaging system. In comparison to other measurement methods, this method has the advantage of immunity to background noise, independence of atmospheric conditions such as solar radiation, and an improved capability to evaluate effects of turbulence on the measurements. Other significant advantages are integration over all particulate size distribution effects including very small and very large particulates whose concentration is hard to measure, and the fact that this method is a path-integrated measurement. In this implementation attenuation deriving from molecular absorption and from small and large particulate scatter and absorption and their weather dependences are separated out. Preliminary results indicate high correlation with direct transmittance calculations via particle size distribution measurement, and that even at 10.6 micrometers wavelength atmospheric transmission depends noticeably on aerosol size distribution and concentration.
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Dan Sadot, Dan Sadot, O. Zaarur, O. Zaarur, S. Zaarur, S. Zaarur, Norman S. Kopeika, Norman S. Kopeika, } "Technique for active measurement of atmospheric transmittance using an imaging system: implementation at 10.6-μm wavelength", Proc. SPIE 2269, Infrared Technology XX, (17 October 1994); doi: 10.1117/12.188689; https://doi.org/10.1117/12.188689
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