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SSG has investigated the effects of contamination on the straylight rejection performance of many state of the art sensors. Contamination degradation has been measured during standard ground operations and storage. SSG has also modeled the impacts of contamination on the performance of several infrared telescopes such as CIRRIS 1A, CLAES, SPIRIT II & III, as well as visible systems such as the Space Based Visible (SBV) sensor. A general overview of these analyses as well as test data documenting the contamination problem will be reviewed.

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