Secondary Mirror Subassembly In The 2.4 m NASA Optical Telescope

N. Ahmed; K. Doyle

doi:10.1117/12.959432

8 October 1980 Secondary Mirror Subassembly In The 2.4 m NASA Optical Telescope

N. Ahmed, K. Doyle

Proceedings Volume 0250, Optomechanical Systems Design; (1980) https://doi.org/10.1117/12.959432
Event: 24th Annual Technical Symposium, 1980, San Diego, United States

Abstract

The design of the Secondary Mirror Subassembly (SMSA) in the 2.4m NASA Optical Telescope is presented. The secondary mirror is a circular disc provided with a shoulder. Three clamps located 120 apart support the mirror shoulder. On one side of the mirror shoulder, a coated graphite-epoxy ring connects the three clamps. Three axial flexures with a low radial compliance extend out from a support platform constructed of coated graphite-epoxy box struts and invar corners, and provide a nominal in-plane zero coefficient of thermal expansion (CTE). In each invar corner piece, a ball joint provides a connection to a six-degree-of-freedom adjustment system that can move the secondary mirror with a high degree of precision in defocus, decenter, and tilt. Thermal controls that maintain structural-element temperature variations within specified limits insure that the SMSA exceeds stability and figure control requirements on the secondary mirror.

Citation Download Citation

N. Ahmed and K. Doyle "Secondary Mirror Subassembly In The 2.4 m NASA Optical Telescope", Proc. SPIE 0250, Optomechanical Systems Design, (8 October 1980); https://doi.org/10.1117/12.959432

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