15 October 2012 VIIRS on-orbit optical anomaly: investigation, analysis, root cause determination and lessons learned
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Proceedings Volume 8510, Earth Observing Systems XVII; 85101C (2012); doi: 10.1117/12.933863
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States
Abstract
A gradual, but persistent, decrease in the optical throughput was detected during the early commissioning phase for the Suomi National Polar-Orbiting Partnership (SNPP) Visible Infrared Imager Radiometer Suite (VIIRS) Near Infrared (NIR) bands. Its initial rate and unknown cause were coincidently coupled with a decrease in sensitivity in the same spectral wavelength of the Solar Diffuser Stability Monitor (SDSM) raising concerns about contamination or the possibility of a system-level satellite problem. An anomaly team was formed to investigate and provide recommendations before commissioning could resume. With few hard facts in hand, there was much speculation about possible causes and consequences of the degradation. Two different causes were determined as will be explained in this paper. This paper will describe the build and test history of VIIRS, why there were no indicators, even with hindsight, of an on-orbit problem, the appearance of the on-orbit anomaly, the initial work attempting to understand and determine the cause, the discovery of the root cause and what Test-As-You-Fly (TAYF) activities, can be done in the future to greatly reduce the likelihood of similar optical anomalies. These TAYF activities are captured in the “lessons learned” section of this paper.
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Glenn Iona, James Butler, Bruce Guenther, Larissa Graziani, Eric Johnson, Brian Kennedy, Craig Kent, Robert Lambeck, Eugene Waluschka, Xiaoxiong Xiong, "VIIRS on-orbit optical anomaly: investigation, analysis, root cause determination and lessons learned", Proc. SPIE 8510, Earth Observing Systems XVII, 85101C (15 October 2012); doi: 10.1117/12.933863; https://doi.org/10.1117/12.933863
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KEYWORDS
Sensors

Mirrors

Contamination

MODIS

Ultraviolet radiation

Tungsten

Near infrared

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