21 August 1998 Design of a grating mechanism for a near-infrared spectrograph
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Abstract
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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Woon-Yin Wong, Randy W. Cuberly, John R. Andrew, "Design of a grating mechanism for a near-infrared spectrograph", Proc. SPIE 3354, Infrared Astronomical Instrumentation, (21 August 1998); doi: 10.1117/12.317228; https://doi.org/10.1117/12.317228
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