Location of the elevation axis in a large optical telescope

Details Location of the elevation axis in a large optical telescope Location of the elevation axis in a large optical telescope

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apopt..43.1097p&link_type=abstract

Applied Optics, Volume 43, Issue 5, pp. 1097-1107 (2004).

Physics

Optics

Astronomical Telescopes, Position Control, Optics, Mechanical Engineering, Mechanical Stability

Scientific paper

Proposed designs for the next generation of large optical telescopes favor a tripod or quadrupod secondary support, and a primary supported from the back, but it is not yet clear whether the elevation axis should be in front of the primary or behind it. A study is described of the effect of elevation-axis location on key performance parameters (fundamental frequency, blockage, and wind-induced secondary decenter) for a 30-m Cassegrain telescope with a mount configuration that is typical of the new designs. For a fast (e.g., f/1) primary, the best location for the elevation axis is behind the primary. The penalty for moving the elevation axis in front of the primary is roughly a 40% decrease in fundamental frequency and a corresponding reduction in the control bandwidth for pointing and optical alignment.

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