Presenting a high accuracy Theta-Phi-style fiber-positioner prototype with a 15-mm pitch

Marco Haeuser; Florian Lang-Bardl; Josef Richter; Hans-Joachim Hess; Adrian Degwert; Adolf Karasz; Ralf Kosyra; Ulrich Hopp; Ralf Bender

doi:10.1117/12.2056300

24 July 2014 Presenting a high accuracy Theta-Phi-style fiber-positioner prototype with a 15-mm pitch

Marco Haeuser, Florian Lang-Bardl, Josef Richter, Hans-Joachim Hess, Adrian Degwert, Adolf Karasz, Ralf Kosyra, Ulrich Hopp, Ralf Bender

Author Affiliations +

Proceedings Volume 9147, Ground-based and Airborne Instrumentation for Astronomy V; 91476V (2014) https://doi.org/10.1117/12.2056300
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

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.

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Marco Haeuser, Marco Haeuser, Florian Lang-Bardl, Florian Lang-Bardl, Josef Richter, Josef Richter, Hans-Joachim Hess, Hans-Joachim Hess, Adrian Degwert, Adrian Degwert, Adolf Karasz, Adolf Karasz, Ralf Kosyra, Ralf Kosyra, Ulrich Hopp, Ulrich Hopp, Ralf Bender, Ralf Bender, "Presenting a high accuracy Theta-Phi-style fiber-positioner prototype with a 15-mm pitch", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91476V (24 July 2014); doi: 10.1117/12.2056300; https://doi.org/10.1117/12.2056300

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