Proceedings PaperThe Infra-Red Optical System Of ISAMS
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The Improved Stratospheric and Mesospheric Sounder (ISAMS) is an eight channel infrared radiometer which uses the technique of pressure modulation radiometry to measure the temperature and composition of the upper atmosphere. ISAMS will be one of nine main experiments which will be launched on the NASA Upper Atmosphere Research Satellite (UARS) early in the next decade. The programme is directed at studying radiation, photochemistry, dynamics and their interaction in the Earth's atmosphere. ISAMS has an optical system which is designed to produce a well-defined and accurately pointed field of view and it must be critically aligned to yield the expected performance.