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Proceedings Paper

GMTIFS: cryogenic rotary mechanisms for the GMT Integral-Field Spectrograph
Author(s): John Hart; Brady Espeland; Gabe Bloxham; Robert Boz; Dave Bundy; John Davies; Bart Fordham; Nick Herald; Rob Sharp; Annino Vaccarella; Colin Vest
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Paper 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.

Paper Details

Date Published: 22 July 2016
PDF: 17 pages
Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 991264 (22 July 2016); doi: 10.1117/12.2231556
Show Author Affiliations
John Hart, The Australian National Univ. (Australia)
Brady Espeland, The Australian National Univ. (Australia)
Gabe Bloxham, The Australian National Univ. (Australia)
Robert Boz, The Australian National Univ. (Australia)
Dave Bundy, The Australian National Univ. (Australia)
John Davies, The Australian National Univ. (Australia)
Bart Fordham, The Australian National Univ. (Australia)
Nick Herald, The Australian National Univ. (Australia)
Rob Sharp, The Australian National Univ. (Australia)
Annino Vaccarella, The Australian National Univ. (Australia)
Colin Vest, The Australian National Univ. (Australia)


Published in SPIE Proceedings Vol. 9912:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
Ramón Navarro; James H. Burge, Editor(s)

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