Design of a collimator support to provide flexure control on Cassegrain spectrographs

Details Design of a collimator support to provide flexure control on Cassegrain spectrographs Design of a collimator support to provide flexure control on Cassegrain spectrographs

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3355..155r&link_type=abstract

Proc. SPIE Vol. 3355, p. 155-163, Optical Astronomical Instrumentation, Sandro D'Odorico; Ed.

Astronomy and Astrophysics

Astronomy

1

Scientific paper

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.

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