Computer Science – Performance
Scientific paper
Aug 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3354.1053w&link_type=abstract
Proc. SPIE Vol. 3354, p. 1053-1061, Infrared Astronomical Instrumentation, Albert M. Fowler; Ed.
Computer Science
Performance
Scientific paper
The grating turret is one of many parts of the Gemini near IR spectrograph being designed for the Gemini 8m telescope project. It provides four gratings and one flat mirror mount, with each one able to tilt in discrete 1/4 degree steps over a full +/- 7.5 degree range while maintaining a 1/10 pixel or 2.7 micrometers position stability. There are distinct design features satisfying space, weight, and performance limitations. We use 2 motors, one to control the grating selection, and one for grating tilt. These motors are locate outside the vacuum/cryogenic environment for easy access. We employ a proven technique using rubbing plates to provide thermal contact for effective cooling. 3D modeling was used extensively to optimize weight and structural stiffness for the mechanism.
Andrew John R.
Cuberly Randy W.
Wong Woon-Yin
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