22 July 2016 GMTIFS: cryogenic rotary mechanisms for the GMT Integral-Field Spectrograph
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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, John Hart, Brady Espeland, Brady Espeland, Gabe Bloxham, Gabe Bloxham, Robert Boz, Robert Boz, Dave Bundy, Dave Bundy, John Davies, John Davies, Bart Fordham, Bart Fordham, Nick Herald, Nick Herald, Rob Sharp, Rob Sharp, Annino Vaccarella, Annino Vaccarella, Colin Vest, 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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