Design of a grating mechanism for a near-infrared spectrograph

Woon-Yin Wong; Randy W. Cuberly; John R. Andrew

doi:10.1117/12.317228

21 August 1998 Design of a grating mechanism for a near-infrared spectrograph

Woon-Yin Wong, Randy W. Cuberly, John R. Andrew

Proceedings Volume 3354, Infrared Astronomical Instrumentation; (1998) https://doi.org/10.1117/12.317228
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

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.

Citation Download Citation

Woon-Yin Wong, Randy W. Cuberly, and John R. Andrew "Design of a grating mechanism for a near-infrared spectrograph", Proc. SPIE 3354, Infrared Astronomical Instrumentation, (21 August 1998); https://doi.org/10.1117/12.317228

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