Validation of spectral radiance assignments to integrating sphere radiance standards for the Advanced Baseline Imager

B. Carol Johnson; Stephen Maxwell; Eric Shirley; Kim Slack; Gary D. Graham

doi:10.1117/12.2065509

25 September 2014 Validation of spectral radiance assignments to integrating sphere radiance standards for the Advanced Baseline Imager

B. Carol Johnson, Stephen Maxwell, Eric Shirley, Kim Slack, Gary D. Graham

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Proceedings Volume 9218, Earth Observing Systems XIX; 92180Z (2014) https://doi.org/10.1117/12.2065509
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

Abstract

The Advanced Baseline Imager (ABI) is the next-generation imaging sensor for the National Oceanic and Atmospheric Administration’s (NOAA’s) operational meteorological satellites in geostationary orbit. One pathway for traceability to reference standards of the visible and near-infrared radiometric response for ABI is to a 1.65 m diameter integrating sphere source standard of spectral radiance. This source illuminates the full entrance pupil via the ABI Earth-view port, thus determining the absolute spectral radiance responsivity in the visible and shortwave infrared. The spectral radiance values of the large sphere are assigned by Exelis using a double monochromator and a 15.24 cm diameter integrating sphere source standard that is calibrated by NIST. As part of the ABI program, Exelis was required by NASA to have the spectral radiance values assigned by Exelis to the large sphere be validated by NIST. Here we report the results of that activity, which took place in April, 2013. During the week of April 8, Exelis calibrated the 1.65 m diameter sphere at all 24 levels that correspond to the ABI calibration protocol. During the week of April 15, the NIST validation exercise for five selected levels took place. NIST deployed a portable spectral radiance source, a filter radiometer restricted to the visible and near-infrared, and two spectroradiometers that covered from 350 nm to 2500 nm. The NIST sphere source served as the validation standard. The comparison results, which are reported at the ABI bands, agreed to within the combined uncertainties. We describe the methodology, results, and uncertainty estimates related to this effort.

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B. Carol Johnson, Stephen Maxwell, Eric Shirley, Kim Slack, and Gary D. Graham "Validation of spectral radiance assignments to integrating sphere radiance standards for the Advanced Baseline Imager", Proc. SPIE 9218, Earth Observing Systems XIX, 92180Z (25 September 2014); https://doi.org/10.1117/12.2065509

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KEYWORDS

Optical spheres

Calibration

Lamps

Radiometry

Integrating spheres

Sensors

Visible radiation

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