9 July 1998 Design of a collimator support to provide flexure control on Cassegrain spectrographs
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Abstract
The Echellette Spectrograph and Imager (ESI) is being built at UCO/Lick Observatory for the Cassegrain focus of the Keck II telescope. The collimator mirror is optimally constrained by a space-frame structure. It will be actively moved to provide the focus and flexure (tip and tilt) control for the instrument. Careful attention to space-frame geometry has simplified the mechanical design. Analytical and Finite Element Analysis (FEA) are presented to demonstrate how a simple but very stiff structure is used to provide support, flexure control, and focus.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Matthew V. Radovan, Bruce C. Bigelow, Jerry E. Nelson, and Andrew I. Sheinis "Design of a collimator support to provide flexure control on Cassegrain spectrographs", Proc. SPIE 3355, Optical Astronomical Instrumentation, (9 July 1998); doi: 10.1117/12.316826; https://doi.org/10.1117/12.316826
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