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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 5 — Feb. 10, 2004
  • pp: 1097–1107

Location of the elevation axis in a large optical telescope

Stephen Padin  »View Author Affiliations


Applied Optics, Vol. 43, Issue 5, pp. 1097-1107 (2004)
http://dx.doi.org/10.1364/AO.43.001097


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Abstract

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.

© 2004 Optical Society of America

OCIS Codes
(220.4880) Optical design and fabrication : Optomechanics
(350.1260) Other areas of optics : Astronomical optics

Citation
Stephen Padin, "Location of the elevation axis in a large optical telescope," Appl. Opt. 43, 1097-1107 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-5-1097

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