1. Determination of the solar calibration constant for a sun-sky radiometer : proposal of an in-situ procedure
- Author
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Monica Campanelli, Bruno Olivieri, and Teruyuki Nakajima
- Subjects
Thickness measurement ,Meteorology ,Materials Science (miscellaneous) ,Mie scattering ,media_common.quotation_subject ,SKYNET ,Radiometers ,Particle size analysis ,Industrial and Manufacturing Engineering ,Calibration ,OCIS codes: 010.1290 ,010.1110 ,Business and International Management ,Sun sky radiometer ,Settore MAT/07 - Fisica Matematica ,Remote sensing ,media_common ,Aerosols ,Radiometer ,Optical properties ,Solar equipment ,Solar calibration constant ,Aerosol ,Wavelength ,Sky ,Aerosol size distribution ,Environmental science ,Atmospheric optics - Abstract
A new procedure is presented for-determining in situ the solar calibration constant, i.e., the Sun-sky radiometer counts for a direct normal solar flux extrapolated to the top of the atmosphere. The method makes use of a modified version of the Langley plot based on the use of an inversion code of column-integrated aerosol size distribution, and it is ordinarily applied to calibrate Prede Sun-sky radiometers. To analyze how such an in situ method can work accurately, the technique has been applied to a five-month dataset obtained from measurements taken in Rome, Italy, by a Prede Sun-sky radiometer from 22 April to 5 November 2001. The precision of the in situ method has been estimated to within 1-2.5%, depending on the wavelength. © 2004 Optical Society of America.
- Published
- 2004
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