A Mirror Mount For Cryogenic Environments

Bijan Iraninejad; Daniel Vukobratovich; Ralph M Richard; Ramsey K Melugin

doi:10.1117/12.939264

5 January 1984 A Mirror Mount For Cryogenic Environments

Bijan Iraninejad, Daniel Vukobratovich, Ralph M Richard, Ramsey K Melugin

Proceedings Volume 0450, Structural Mechanics of Optical Systems I; (1984) https://doi.org/10.1117/12.939264
Event: 1983 Cambridge Symposium, 1983, Cambridge, United States

Abstract

The finite element method was used to study the effect of mount-induced aberrations on the optical surface of a lightweight double arch mirror subjected to cryogenic temperatures. The mount design was controlled by the requirements imposed on the optical surface quality and stress levels. The finite element analysis was used to define the feasible range of mount parameters and the selection of a design within the feasible region. The final design consisted of three spring-loaded Invar T-clamps that uniquely define the location of the mirror, three radially compliant parallel spring guides that remove the effect of radial contraction of structure in cryogenic temperatures, and a flexible baseplate that was used to reduce the effect of temperature-induced baseplate tilt errors. The experimental results from the applica-tion of this system to an existing 20-inch fused silica double arch mirror are shown, and possible improvements in system performance are discussed.

Citation Download Citation

Bijan Iraninejad, Daniel Vukobratovich, Ralph M Richard, and Ramsey K Melugin "A Mirror Mount For Cryogenic Environments", Proc. SPIE 0450, Structural Mechanics of Optical Systems I, (5 January 1984); https://doi.org/10.1117/12.939264

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