Physics – Optics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982lastr..96..227c&link_type=abstract
L'Astronomie, vol. 96, May 1982, p. 227-236. In French.
Physics
Optics
Telescopes, Canada, Cassegrain Optics, France, Hawaii, Lenses, Numerical Control, Photometry, Silicon, Temperature Compensation
Scientific paper
The features, performance, and discoveries of the Canada-France-Hawaii 3.6m telescope located on Mauna Kea are described. The choice of design around 4 m was constrained by financial considerations, which are asserted to increase significantly in building larger instruments. The fused silicon primary lens resists thermal deformation and is capable of concentrating 50 percent of the received luminescence into a diameter of less than 0.2 arcsec. The telescope moves on a horseshoe track 10 m in diameter and has an axis of declination starting from 1/3 of the cradle. Computer controls automatically align the instrument and compensate for thermal changes in the structure. The objective also includes an f/8 secondary lens and an f/35 oscillating Cassegrain lens for IR viewing. Control of the microclimate which forms in the cupola is discussed.
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