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9 September 2019 Checking AIRS nonlinearity in flight
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Radiances from the Atmospheric Infrared Sounder (AIRS) show excellent stability and are traceable to SI standards through the On-Board Calibrator (OBC) blackbody. The OBC can be used to check the nonlinearity by turning off the heater and letting the target float from 308K to roughly 261K while acquiring data. The OBC Float test was performed once prior to launch, and again shortly after launch. However, the OBC Float test did not produce accurate nonlinearity results because the temperature sensors became inaccurate below 290K. This paper summarizes a technique using a reference channel that is highly linear to measure the apparent temperature of the OBC, then using that temperature to determine the nonlinearity of the other channels. This method works well, and we are able to confirm the nonlinearity derived pre-flight for most of the channels. The AIRS has A side and B side channels that have different gain and nonlinearities, but the OBC float test was performed with an A/B optimum data set. We recommend repeating the test with A side and B side only gains selected for the channels.
Conference Presentation
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thomas S. Pagano, Evan M. Manning, Steven E. Broberg, and Hartmut H. Aumann "Checking AIRS nonlinearity in flight", Proc. SPIE 11127, Earth Observing Systems XXIV, 1112717 (9 September 2019);


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