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3 September 2008 Model estimation of the HIRDLS exit aperture fractional open area
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The High Resolution Dynamics Limb Sounder (HIRDLS) instrument suffered a debilitating event during the Aura Satellite launch on July 15, 2004. After the initial instrument activation phase was completed 25 days later, the first atmospheric scan tests revealed a much different radiance field than was expected prior to launch. A subsequent lengthy investigation suggested that the HIRDLS exit aperture was mostly obstructed by sheathing material that lined the inner fore-optics cavity. As part of the radiance correction process workaround, it is necessary to provide radiances to the retrieval algorithm that are equivalently unobstructed (clear view); hence, knowledge on the amount of unobstructed exit-aperture area is needed. This manuscript describes the problem and the modeling method used to estimate the amount of unobstructed area of the HIRDLS exit aperture. Particular emphasis will be given to the type of data required to ascertain this quantity. Lastly, a diagnostic scheme for evaluating the calculated unobstructed open area for each channel will be discussed, along with a look to the future.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
T. D. Eden Jr. "Model estimation of the HIRDLS exit aperture fractional open area", Proc. SPIE 7082, Infrared Spaceborne Remote Sensing and Instrumentation XVI, 708218 (3 September 2008);

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