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Dimensional stabilityThe temporal stability of glass and glass-ceramic materials is important to the success of a large diffraction-limited telescope. The results are presented of an experimental study of the dimensional stability of glasses and glass ceramics being considered for substrates of massive diffraction-limited mirrors designed for several years of service in earth orbit. The purpose of the study was to measure the relative change in length of the candidate substrate materials, to the order of 5 parts in 10 to the 8th power, as a function of several years time. The development of monolithic test etalons, the development and improvement of two types of ultra-high precision interferometers, and certain aspects of tests data presently achieved are discussed.
Document ID
19760010160
Acquisition Source
Marshall Space Flight Center
Document Type
Contractor Report (CR)
Authors
Hocken, R. (Corning Glass Works NY, United States)
Justie, B. (Corning Glass Works NY, United States)
Date Acquired
September 3, 2013
Publication Date
February 1, 1976
Subject Category
Nonmetallic Materials
Report/Patent Number
NASA-CR-144162
Accession Number
76N17248
Funding Number(s)
CONTRACT_GRANT: NAS8-28662
Distribution Limits
Public
Copyright
Public Use Permitted.

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