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26 February 2004 Development of an infrared collimator as optical ground support equipment for IASI instrument
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The Infrared Atmospheric Sounding Interferometer (IASI), an instrument to be carried on METOP satellites, has been developed by Alcatel Space, for final use by CNES and EUMETSAT. The objective is an improvement of vertical resolution and accuracy of temperature and humidity atmospheric profiles measurement. This development created the need of an infrared collimator whose mission is to characterise Pixel Angular Response and to localise optical axis of the flight hardware. For this purpose, a collimator covering the spectral range 645 - 2760 cm-1 has been designed, manufactured in collaboration with AMOS company and delivered to Alcatel Space. Infrared source uses a blackbody working from 310 to 1200 K followed by spectral filtering. Motorization allows angular orientation on two axes around the IASI instrument entrance pupil with a 10 μrad accuracy. The present contribution will provide the critical points, which have been identified and solved during manufacturing and testing inside CSL vacuum facilities.
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Jean-Herve Lecat, Philippe Ronchain, Pierre Franco, Yvette Houbrechts, Emmanuel Mazy, Yvan Stockman, Pierre Gloesener, and Philippe Cheroutre "Development of an infrared collimator as optical ground support equipment for IASI instrument", Proc. SPIE 5252, Optical Fabrication, Testing, and Metrology, (26 February 2004);

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