Physics – Optics
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979spie..183..114l&link_type=abstract
In: Space optics; Proceedings of the Seminar, Huntsville, Ala., May 22-24, 1979. (A80-17432 05-89) Bellingham, Wash., Society of
Physics
Optics
Fabrication, Glass, Hubble Space Telescope, Mirrors, Substrates, Honeycomb Cores, Inspection, Thermal Expansion
Scientific paper
The paper considers the Space Telescope lightweight mirror substrate. The ULE glass fabricated into a 10-in. thick core faced with front and back plates was manufactured by flame hydrolysis which reacts silicon and titanium tetrachloride vapors in a flame to produce molten glass particles. These particles are collected on rotating tables to form 60-in. diameter clear glass disks 5-6 in. thick, from which the substrate is fabricated. ULE is weldable, so that disks sawed into slabs are welded into inner and outer rings and a honeycomb core. The coefficient of thermal expansion (CTE) of ULE is in a linear correlation with ultrasonic velocity, permitting nondestructive evaluation and documentation of the actual material used for component parts; this assures that the final blank will meet the homogeneity requirements for CTE and for near-zero CTE.
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