@inproceedings{fd6773c719cb49ffb801dc5acddd7f14,
title = "GMTIFS: Cryogenic rotary mechanisms for the GMT Integral-Field Spectrograph",
abstract = "A representative range of the rotary mechanisms proposed for use in GMTIFS is described. All are driven by cryogenically rated stepper motors. For each mechanism, angular position is measured by means of eddy current sensors arranged to function as a resolver. These measure the linear displacement of a decentered aluminum alloy target in two orthogonal directions, from which angular position is determined as a function of the displacement ratio. Resolver function and performance is described. For each mechanism, the mechanical design is described and the adequacy of positioning repeatability assessed. Options for improvement are discussed.",
keywords = "Angular position repeatability, Eddy current sensor, Resolver, Rotary mechanism, Stepper motor",
author = "John Hart and Brady Espeland and Gabe Bloxham and Robert Boz and Dave Bundy and John Davies and Bart Fordham and Nick Herald and Rob Sharp and Annino Vaccarella and Colin Vest",
note = "Publisher Copyright: {\textcopyright} 2016 SPIE.; Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II ; Conference date: 26-06-2016 Through 01-07-2016",
year = "2016",
doi = "10.1117/12.2231556",
language = "English",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Ramon Navarro and Burge, {James H.}",
booktitle = "Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II",
address = "United States",
}