Physics – Optics
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apopt..18.1941b&link_type=abstract
Applied Optics, vol. 18, June 15, 1979, p. 1941-1949.
Physics
Optics
13
Atmospheric Scattering, Diffuse Radiation, Radiometers, Sky Radiation, Solar Radiation, Accuracy, Aerosols, Algorithms, Approximation, Correction, Light Scattering, Optical Measurement, Optical Thickness, Particle Size Distribution, Perturbation Theory
Scientific paper
Whenever a solar radiometer is used to measure direct solar radiation, some diffuse sky radiation invariably enters the detector's field of view along with the direct beam. Therefore, the atmospheric optical depth obtained by the use of Bouguer's transmission law (also called Beer-Lambert's law), that is valid only for direct radiation, needs to be corrected by taking account of the scattered radiation. This paper discusses the correction factors needed to account for the diffuse (i,e., singly and multiply scattered) radiation and the algorithms developed for retrieving aerosol size distribution from such measurements. For a radiometer with a small field of view (half-cone angle of less than 5 deg) and relatively clear skies (optical depths less than 0.4), it is shown that the total diffuse contribution represents approximately 1% of the total intensity.
Box Michael A.
Deepak A.
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