Computer Science
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980spie..250...24a&link_type=abstract
In: Optomechanical systems design; Proceedings of the Seminar, San Diego, CA, July 31, 1980. (A81-39571 18-74) Bellingham, WA, S
Computer Science
Mirrors, Structural Design, Telescopes, Actuators, Graphite-Epoxy Composites, Nasa Programs
Scientific paper
The secondary mirror is a circular disc provided with a shoulder. Three clamps located 120 deg 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 structs and invar corners, and provide a nominal in-plane zero coefficient of thermal expansion. In each invar corner piece, a ball joint provides a connection to a expansion. 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 assembly exceeds stability and figure control requirements on the secondary mirror.
Ahmed Nasr
Doyle K.
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