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Proceedings Paper

Secondary Mirror Subassembly In The 2.4 m NASA Optical Telescope
Author(s): N. Ahmed; K. Doyle
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Paper 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.

Paper Details

Date Published: 8 October 1980
PDF: 3 pages
Proc. SPIE 0250, Optomechanical Systems Design, (8 October 1980); doi: 10.1117/12.959432
Show Author Affiliations
N. Ahmed, Optical Technology Division—Perkin-Elmer (United States)
K. Doyle, Optical Technology Division—Perkin-Elmer (United States)


Published in SPIE Proceedings Vol. 0250:
Optomechanical Systems Design
Mete Bayar, Editor(s)

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