Ultraviolet compatibility tests of lens coupling fluids used in astronomical instrumentation

Type Conference Paper
Names Kenneth Nordsieck, Frenk Nosan, J. Alan Schier
Conference Name Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series
Volume 7735
Pages 262
Date July 1, 2010
URL http://adsabs.harvard.edu/abs/2010SPIE.7735E.262N
Library Catalog NASA ADS
Abstract We report on extensive laboratory testing of the optical compatibility of immersion fluids often used in astronomical instrumentation. A strong near-ultraviolet absorption feature is seen after incubating several fluids with polyurethane often used in expansion bladders, and a lesser absorption in the farther UV with Viton O-Ring material. Substitute materials were tested, many of which show no such absorption. This program was started in response to a strong UV feature which developed over time in the Robert Stobie Spectrograph of the Southern African Large Telescope. A repair strategy was successfully implemented.
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