Comparison of two methodologies for calibrating satellite instruments in the visible and near-infrared

Applied Optics
Robert A BarnesChristopher Moeller

Abstract

Traditionally, satellite instruments that measure Earth-reflected solar radiation in the visible and near infrared wavelength regions have been calibrated for radiance responsivity in a two-step method. In the first step, the relative spectral response (RSR) of the instrument is determined using a nearly monochromatic light source such as a lamp-illuminated monochromator. These sources do not typically fill the field of view of the instrument nor act as calibrated sources of light. Consequently, they only provide a relative (not absolute) spectral response for the instrument. In the second step, the instrument views a calibrated source of broadband light, such as a lamp-illuminated integrating sphere. The RSR and the sphere's absolute spectral radiance are combined to determine the absolute spectral radiance responsivity (ASR) of the instrument. More recently, a full-aperture absolute calibration approach using widely tunable monochromatic lasers has been developed. Using these sources, the ASR of an instrument can be determined in a single step on a wavelength-by-wavelength basis. From these monochromatic ASRs, the responses of the instrument bands to broadband radiance sources can be calculated directly, eliminating the need ...Continue Reading

References

Nov 16, 2004·Applied Optics·Robert A BarnesCharles R McClain
Mar 21, 2008·Applied Optics·R A BarnesA W Holmes
Mar 28, 2008·Applied Optics·R A BarnesC R McClain
Jan 1, 2013·Journal of Research of the National Institute of Standards and Technology·C E CramerA W Smith

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