OIL-VAPOUR CONTAMINATION OF SATELLITE OPTICAL SURFACES.
ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (ENGLAND)
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The effects of oil-vapour contamination on satellite optical surfaces when exposed to high vacuum and ultra-violet irradiation were investigated. The oil coatings tried, when exposed to ultra-violet radiation under vacuum, caused severe and apparently permanent degradation of optical performance in the ultra-violet region of the electromagnetic spectrum. It is concluded that no oil or grease should be used in satellite mechanisms which are near optical surfaces used for measurements in the ultra-violet. Author