Solar attenuation screen transmittance, modulation, and albedo for JPSS J2

Staci Klein; Vijay Murgai; Lindsay Johnson

doi:10.1117/12.2530398

9 September 2019 Solar attenuation screen transmittance, modulation, and albedo for JPSS J2

Staci Klein, Vijay Murgai, Lindsay Johnson

Proceedings Volume 11127, Earth Observing Systems XXIV; 111270E (2019) https://doi.org/10.1117/12.2530398
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

The Visible/Infrared Imaging Radiometer Suite (VIIRS) is a key sensor on the Suomi National Polar-orbiting Partnership (NPP) satellite as well as Joint Polar Satellite System (JPSS). VIIRS collects Earth radiometric and imagery data in 22 spectral bands from 0.4 to 12.5 μm. Radiometric calibration of the reflective solar bands in the 0.4 to 2.5 μm wavelength range is performed by measuring the sunlight reflectance from Solar Diffuser Assembly (SDA). The Solar Attenuation Screen (SAS) is designed to adjust the amount of sunlight reaching the SDA so that the albedo levels seen by VIIRS are comparable to VIIRS earth view while rejecting light reflected from the earth. As the throughput varies with sun angle of incidence, the J2 SAS transmittance was characterized over the as use angular range (13-32 degrees in azimuth and 15- 18.5 degrees in declination) with an uncertainty better than 0.2%. The results of the SAS transmittance was then combined with the Bidirectional Reflectance Distribution Function (BRDF) of the SDA to calculate the albedo levels over the sun angular range used for calibration. This paper will present the spatial signal modulation of the SAS. The setup of the test station allows for the SAS’s transmission and modulation to be measured in the as used configuration.

Citation Download Citation

Staci Klein, Vijay Murgai, and Lindsay Johnson "Solar attenuation screen transmittance, modulation, and albedo for JPSS J2", Proc. SPIE 11127, Earth Observing Systems XXIV, 111270E (9 September 2019); https://doi.org/10.1117/12.2530398

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