1 July 1990 Accomodating CTE discontinuities in a ULE mosaic mirror
Author Affiliations +
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.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael H. Krim, Michael H. Krim, Gregory P. Ruthven, Gregory P. Ruthven, Bernard F. Skrobacz, Bernard F. Skrobacz, } "Accomodating CTE discontinuities in a ULE mosaic mirror", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); doi: 10.1117/12.19230; https://doi.org/10.1117/12.19230

Back to Top