Physics – Optics
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980oits.conf..448h&link_type=abstract
Optical and Infrared Telescopes for the 1990's. Proceedings of the conference held 7-12 January, 1980 in Tucson, AZ. Edited by
Physics
Optics
Cassegrain Optics, Fresnel Reflectors, Infrared Telescopes, Structural Design Criteria, Thickness Ratio, Apertures, Cost Reduction, Focal Plane Devices, Image Resolution, Infrared Astronomy, Roller Bearings, Supports, Weight Reduction
Scientific paper
The United Kingdom's infrared telescope has f/q Cassegrain and f/20 coude focal planes and the additional option of an f/35 Cassegrain chopping secondary mirror. The optical system including contributions from the secondary mirror, the respective support systems, and atmospheric viewing gives a Cassegrain image of diameter 1 arcsec (90% incident radiation) and a coude image of diameter 1.25 arcsec. A thin mirror approach is used both for primary and secondary mirrors. The lightweight design concept can be applied to altazimuth as well as equatorial designs and to optical as well as to infrared ground based telescopes. It can be used in conjunction with the segmented or multiple mirror approach.
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