Finite bandwidth and scattered light effects on the radiometric determination of atmospheric turbidity and the solar constant

Details Finite bandwidth and scattered light effects on the radiometric determination of atmospheric turbidity and the solar constant Finite bandwidth and scattered light effects on the radiometric determination of atmospheric turbidity and the solar constant

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apopt..20.2215b&link_type=abstract

Applied Optics, vol. 20, July 1, 1981, p. 2215-2219.

Physics

Optics

4

Aerosols, Atmospheric Scattering, Atmospheric Turbulence, Optical Thickness, Solar Constant, Solar Flux, Beer Law, Extraterrestrial Radiation, Monochromatic Radiation, Radiometers, Spectrum Analysis

Scientific paper

The effects of finite filter bandwidth and scattered light on the spectral radiometric determination of the total optical thickness of the atmosphere and the extraterrestrial solar intensity are analyzed. Beer's law is integrated over the filter wavelength band taking into account the wavelength variation of the atmospheric optical depth and the extraterrestrial solar flux, and it is found that for small bandwidths, the expressions for the slope and the intercept of the Langley plot differ little from their monochromatic values. Expressions are then obtained for the derivatives of the extraterrestrial solar spectrum under the assumption of a blackbody solar spectrum. The effect of scattered light in the detector field of view is shown to modify the slope of the Langley plot in a manner opposite to the spectral variability. Quantitative results are presented for a series of typical cases and it is found that in most narrowband cases, spectral variability effects are an order of magnitude smaller than scattering effects.

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