Accommodating CTE discontinuities in a ULE mosaic mirror

Details Accommodating CTE discontinuities in a ULE mosaic mirror Accommodating CTE discontinuities in a ULE mosaic mirror

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1236..605k&link_type=abstract

IN: Advanced technology optical telescopes IV; Proceedings of the Meeting, Tucson, AZ, Feb. 12-16, 1990. Part 2 (A91-23201 08-89

Physics

Flat Surfaces, Mirrors, Mosaics, Reflecting Telescopes, Thermal Expansion, Fabrication, Finite Element Method, Nastran

Scientific paper

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.

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