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Proceedings Paper

Accomodating CTE discontinuities in a ULE mosaic mirror
Author(s): Michael H. Krim; Gregory P. Ruthven; Bernard F. Skrobacz
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Paper Abstract

While coefficient of thermal expansion (CTE) differences between the facets of a large (8-m diameter) telescope's hexagonal-mosaic mirror generate optically significant deformations in the midspatial frequency regime, when the average temperature of the mirror undergoes substantial change, it is presently established that the magnitude of these deformations lie within acceptable limits for the active figure-control system envisioned for such telescopes. It is nevertheless recommended that CTE discontinuities within such mosaics be consciously planned for at the outset of construction planning.

Paper Details

Date Published: 1 July 1990
PDF: 10 pages
Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); doi: 10.1117/12.19230
Show Author Affiliations
Michael H. Krim, Hughes Danbury Optical Systems, Inc. (United States)
Gregory P. Ruthven, Hughes Danbury Optical Systems, Inc. (United States)
Bernard F. Skrobacz, Hughes Danbury Optical Systems, Inc. (United States)


Published in SPIE Proceedings Vol. 1236:
Advanced Technology Optical Telescopes IV
Lawrence D. Barr, Editor(s)

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