Accomodating CTE discontinuities in a ULE mosaic mirror

Michael H. Krim; Gregory P. Ruthven; Bernard F. Skrobacz

doi:10.1117/12.19230

1 July 1990 Accomodating CTE discontinuities in a ULE mosaic mirror

Michael H. Krim, Gregory P. Ruthven, Bernard F. Skrobacz

Proceedings Volume 1236, Advanced Technology Optical Telescopes IV; (1990) https://doi.org/10.1117/12.19230
Event: SPIE Astronomical Telescopes and Instrumentation for the 21st Century, 1990, Tucson, AZ, United States

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.

Citation Download Citation

Michael H. Krim, Gregory P. Ruthven, and Bernard F. Skrobacz "Accomodating CTE discontinuities in a ULE mosaic mirror", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); https://doi.org/10.1117/12.19230

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