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Proceedings Paper

Ultraviolet compatibility tests of lens coupling fluids used in astronomical instrumentation
Author(s): Kenneth Nordsieck; Frenk Nosan; J. Alan Schier
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Paper 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.

Paper Details

Date Published: 20 July 2010
PDF: 7 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 773582 (20 July 2010); doi: 10.1117/12.858281
Show Author Affiliations
Kenneth Nordsieck, Univ. of Wisconsin-Madison (United States)
Frenk Nosan, The Pilot Group (United States)
J. Alan Schier, The Pilot Group (United States)


Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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