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Improved Coude Efficiency of Existing Telescopes

Published online by Cambridge University Press:  12 April 2016

W.A. Grundmann  and
E.H. Richardson
W.A. Grundmann
Affiliation:
Herzberg Institute of Astrophysics, Dominion Astrophysical Observatory, Victoria, B.C.
E.H. Richardson
Affiliation:
Herzberg Institute of Astrophysics, Dominion Astrophysical Observatory, Victoria, B.C.

Abstract

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The ordinary coudé train has a single, large, aluminum coated mirror at each reflection point. This introduces considerable light loss because several reflections are required, and the long light path in turbulent air blurs the stellar image by telescope “seeing” effects. The transmission can be increased and the blur decreased by a train of small mirrors with high reflectance coatings. The high reflectance coatings have the added advantages that they can reduce polarization effects and flatten response curves.

Type
Section I: Optical Telescopes, Existing And Planned
Information
International Astronomical Union Colloquium , Volume 67: Instrumentation for Astronomy with Large Optical Telescopes , 1982 , pp. 61 - 66
Copyright
Copyright © Reidel 1982

References

Richardson, E.H., Brealey, G.A. and Dancey, R. 1971, Pub. Dom. Astr. Obs., 14, pp. 1–15.Google Scholar
Richardson, E.H. 1971, Proceedings of ESO/CERN Conference on Large Telescope Design, ed. West, R.M. pp. 179–193.Google Scholar
Richardson, E.H. 1972, Proceedings of ESO/CERN Conference on Auxiliary Instrumentation for Large Telescopes, ed. Laustsen, S. and Reiz, A. pp. 275–284.Google Scholar