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Proceedings Paper

Presenting a high accuracy Theta-Phi-style fiber-positioner prototype with a 15-mm pitch
Author(s): Marco Haeuser; Florian Lang-Bardl; Josef Richter; Hans-Joachim Hess; Adrian Degwert; Adolf Karasz; Ralf Kosyra; Ulrich Hopp; Ralf Bender
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Paper Abstract

We present a Θ - Φ-style fiber-positioner prototype, which will be controlled via the EMI-robust CAN-Bus. Our positioner points without iterations or a metrology system. Due to the overlapping patrol disc of 17.3 mm diameter, we reach a filling factor of 100 %. The positioners diameter is 14.6 mm, containing the control electronics on a contemporary PCB of 13.5 mm width. While moving, the power consumption does not lead to a significant rise in temperature. Given a mechanical reference point measured by stall detection, the absolute accuracy is 27 μm (1σ = 14 µm) and pointings are repeatable with 7 μm (1σ = 4 μm). Better positioning may be reachable with upcoming calibration.

Paper Details

Date Published: 24 July 2014
PDF: 14 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91476V (24 July 2014); doi: 10.1117/12.2056300
Show Author Affiliations
Marco Haeuser, Univ.-Sternwarte München (Germany)
Florian Lang-Bardl, Univ.-Sternwarte München (Germany)
Josef Richter, Univ.-Sternwarte München (Germany)
Hans-Joachim Hess, Univ.-Sternwarte München (Germany)
Adrian Degwert, Univ.-Sternwarte München (Germany)
Adolf Karasz, Univ.-Sternwarte München (Germany)
Ralf Kosyra, Univ.-Sternwarte München (Germany)
Ulrich Hopp, Univ.-Sternwarte München (Germany)
Max-Planck-Institut für extraterrestrische Physik (Germany)
Ralf Bender, Univ.-Sternwarte München (Germany)
Max-Planck-Institut für extraterrestrische Physik (Germany)

Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)

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