| 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. |