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Proceedings Paper

HIRES the high-resolution spectrograph for the E-ELT: dynamics and control of the repositioning mechanism for the E-ELT HIRES polarimeter
Author(s): I. Di Varano; K. G. Strassmeier; M. Woche
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Paper Abstract

A full Stokes dual channel polarimeter for the E-ELT HIRES spectrograph has been envisioned for the intermediate focus f/4.4, operating within a spectral range of 0.4-1.6 μ. It will feed the EELT- HIRES instrument located on the Nasmyth platform via two pairs of dedicated fibers: one fibre pair optimized for the BVRI, the other one optimized for the JH band or any other feasible combination. The instrument must be retractable within a workspace in fulfillment with the ESO requirements on the allocated volume and the dynamic response of the AO tower. For such purpose a swinging arm has been designed with a rotation provided by 5 revolute joints and a jackscrew. Moreover repeatability in repositioning has to be guaranteed by a parallel manipulator, performing an alignment procedure mainly along 5 axes. Dynamics and control criteria with a feed forward chain to compensate for vibration forces and feedback chain for tracking procedure are hereafter presented.

Paper Details

Date Published: 9 August 2016
PDF: 10 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99089L (9 August 2016); doi: 10.1117/12.2231953
Show Author Affiliations
I. Di Varano, Leibniz-Institut für Astrophysik Potsdam (Germany)
K. G. Strassmeier, Leibniz-Institut für Astrophysik Potsdam (Germany)
M. Woche, Leibniz-Institut für Astrophysik Potsdam (Germany)

Published in SPIE Proceedings Vol. 9908:
Ground-based and Airborne Instrumentation for Astronomy VI
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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