GMTIFS: cryogenic rotary mechanisms for the GMT Integral-Field Spectrograph

John Hart; Brady Espeland; Gabe Bloxham; Robert Boz; Dave Bundy; John Davies; Bart Fordham; Nick Herald; Rob Sharp; Annino Vaccarella; Colin Vest

doi:10.1117/12.2231556

22 July 2016 GMTIFS: cryogenic rotary mechanisms for the GMT Integral-Field Spectrograph

John Hart; Brady Espeland; Gabe Bloxham; Robert Boz; Dave Bundy; John Davies; Bart Fordham; Nick Herald; Rob Sharp; Annino Vaccarella; Colin Vest;

Author Affiliations +

Proceedings Volume 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II; 991264 (2016) https://doi.org/10.1117/12.2231556
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

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.

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John Hart, Brady Espeland, Gabe Bloxham, Robert Boz, Dave Bundy, John Davies, Bart Fordham, Nick Herald, Rob Sharp, Annino Vaccarella, Colin Vest, "GMTIFS: cryogenic rotary mechanisms for the GMT Integral-Field Spectrograph", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 991264 (22 July 2016); doi: 10.1117/12.2231556; https://doi.org/10.1117/12.2231556

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