Ethylene glycol contamination effects on first surface aluminized mirrors

Patrick Dunlop; Ronald G. Probst; Matthew Evatt; Larry Reddell; David Sprayberry

doi:10.1117/12.2233233

27 July 2016 Ethylene glycol contamination effects on first surface aluminized mirrors

Patrick Dunlop, Ronald G. Probst, Matthew Evatt, Larry Reddell, David Sprayberry

Proceedings Volume 9906, Ground-based and Airborne Telescopes VI; 99063F (2016) https://doi.org/10.1117/12.2233233
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

The Dark Energy Spectroscopic Instrument (DESI) is under construction for installation on the Mayall 4 Meter telescope. The use of a liquid cooling system is proposed to maintain the DESI prime focus assembly temperature within ±1°C of ambient. Due to concerns of fluid deposition onto optical surfaces from possible leaks, systematic tests were performed of the effects on first surface aluminized mirrors of ethylene glycol and two other candidate coolants. Objective measurement of scattering and reflectivity was an important supplement to visual inspection. Rapid cleanup of a coolant spill followed by a hand wash of the mirror limited surface degradation to the equivalent of a few months of general environmental exposure. Prolonged exposure to corrosive coolants dissolved the aluminum, necesitating mirror recoating.

Citation Download Citation

Patrick Dunlop, Ronald G. Probst, Matthew Evatt, Larry Reddell, and David Sprayberry "Ethylene glycol contamination effects on first surface aluminized mirrors", Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99063F (27 July 2016); https://doi.org/10.1117/12.2233233

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available