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Proceedings Paper

Modeling the detector radiometric response gains of the Suomi NPP VIIRS reflective solar bands
Author(s): Ning Lei; Zhipeng Wang; Bruce Guenther; Xiaoxiong Xiong; James Gleason
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Paper Abstract

Right after the opening of the NADIR door of the Visible/Infrared Imager/Radiometer Suite (VIIRS) aboard the Suomi National Polar-orbiting Partnership (NPP) satellite, the detector gains of the Near InfraRed (NIR) bands have decreased much faster than expected, indicating large degradation of the VIIRS sensor optical system. To determine the root cause and to access the potential outcome of the degradation, we developed a mathematical model based on physical hypotheses on the optical system, especially the Rotating Telescope Assembly mirror surfaces. Current detector gains are consistent with a model of a four-mirror system, with each mirror having a thin contaminant layer of material that reduces the mirror transmission and the reduction is activated by solar radiation. The ratios of the reduced transmission coefficients are in good agreement with those from the reflectance measurement of the Traveling Witness Mirror (after exposure of ultraviolet light from a test lamp) independently carried out as part of the degradation anomaly investigation. In this Proceeding, we describe the mathematical model and discuss the results.

Paper Details

Date Published: 19 November 2012
PDF: 11 pages
Proc. SPIE 8533, Sensors, Systems, and Next-Generation Satellites XVI, 853319 (19 November 2012); doi: 10.1117/12.974728
Show Author Affiliations
Ning Lei, Sigma Space Corp. (United States)
Zhipeng Wang, Sigma Space Corp. (United States)
Bruce Guenther, Stellar Solutions Inc. (United States)
Xiaoxiong Xiong, NASA Goddard Space Flight Ctr. (United States)
James Gleason, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 8533:
Sensors, Systems, and Next-Generation Satellites XVI
Roland Meynart; Steven P. Neeck; Haruhisa Shimoda, Editor(s)

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