GMTIFS: Cryogenic rotary mechanisms for the GMT Integral-Field Spectrograph
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Authors
Hart, John
Espeland, Brady
Bloxham, Gabe
Boz, Robert
Bundy, Dave
Davies, John
Fordham, Bartholomew
Herald, Nick
Sharp, Robert
Vaccarella, Annino
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SPIE - The International Society for Optical Engineering
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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Proceedings of SPIE - The International Society for Optical Engineering
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Open Access