Cryogenic surface distortion and hysteresis of a 50 cm diameter fused silica mirror cooled to 77 KA 50 cm diameter, lightweight, Amersil TO8E, fused-natural-quartz mirror with a single arch cross section was tested at the NASA/Ames Research Center Cryogenic Optics Test Facility to measure cryogenic distortion and hysteresis. The mirror was cooled to 77 K in four serial tests and the mirror figure was measured with a phase-measuring interferometer. On the basis of the repeatability of room temperature and cryogenic optical measurements, it was determined that the Single Arch Mirror had no measurable hysteresis and displayed repeatable cryogenic distortion. The Cryogenic Optics Test Facility, optical and thermal test methods, test results, and measurement accuracy are described.
Document ID
19920040236
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Young, Jeffrey A. (Sterling Federal Systems, Inc. Palo Alto, CA, United States)
Howard, Steven D. (Synernet Corp. Fremont, CA, United States)
Augason, Gordon C. (NASA Ames Research Center Moffett Field, CA, United States)
Melugin, Ramsey K. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1990
Subject Category
Engineering (General)
Meeting Information
Meeting: Cryogenic Optical Systems and Instruments IV