Ultraviolet compatibility tests of lens coupling fluids used in astronomical instrumentation

Kenneth Nordsieck; Frenk Nosan; J. Alan Schier

doi:10.1117/12.858281

20 July 2010 Ultraviolet compatibility tests of lens coupling fluids used in astronomical instrumentation

Kenneth Nordsieck, Frenk Nosan, J. Alan Schier

Proceedings Volume 7735, Ground-based and Airborne Instrumentation for Astronomy III; 773582 (2010) https://doi.org/10.1117/12.858281
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

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.

Citation Download Citation

Kenneth Nordsieck, Frenk Nosan, and J. Alan Schier "Ultraviolet compatibility tests of lens coupling fluids used in astronomical instrumentation", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 773582 (20 July 2010); https://doi.org/10.1117/12.858281

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