13 September 2005 Mapping the optical obscuration in the NASA Aura HIRDLS instrument
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Abstract
The High Resolution Dynamics Limb Sounder (HIRDLS) instrument was launched on the NASA Aura satellite in July 2004. HIRDLS is a joint project between the UK and USA, and is a mid-infrared limb emission sounder designed to measure the concentrations of trace species and aerosol, and temperature and pressure variations in the Earth's atmosphere between about 8 and 100 km. The instrument is performing correctly except for a problem with radiometric views out from the main aperture. A series of tests has led to the conclusion that optical beam is obstructed between the scan mirror and the aperture by what is believed to be a piece of Kapton film that became detached during the ascent to orbit. The paper describes measurements aimed at mapping the geometric and radiometric properties of the obstruction using different positions of the aperture door, including in some cases where the sun was made to illuminate the aperture. The aim of the work is to facilitate atmospheric observations through a small part of the aperture which remains clear.
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J. J. Barnett, C. L. Hepplewhite, L. Rokke, J. C. Gille, "Mapping the optical obscuration in the NASA Aura HIRDLS instrument", Proc. SPIE 5883, Infrared Spaceborne Remote Sensing 2005, 58830I (13 September 2005); doi: 10.1117/12.623574; https://doi.org/10.1117/12.623574
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