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Proceedings Paper

Implementation and performance of the metrology system for the multi-object optical and near-infrared spectrograph MOONS
Author(s): Holger Drass; Leonardo Vanzi; Miguel Torres-Torriti; Rolando Dünner ; Tzu-Chiang Shen; Francisco Belmar; Lousie Dauvin; Tomás Staig; Jonathan Antognini; Mauricio Flores; Yerko Luco; Clémentine Béchet; David Boettger; Steven Beard; David Montgomery; Stephen Watson; Alexandre Cabral; Mahmoud Hayati; Manuel Abreu; Phil Rees; Michele Cirasuolo; William Taylor; Alasdair Fairley
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Paper Abstract

The Multi-Object Optical and Near-infrared Spectrograph (MOONS) will cover the Very Large Telescope's (VLT) field of view with 1000 fibres. The fibres will be mounted on fibre positioning units (FPU) implemented as two-DOF robot arms to ensure a homogeneous coverage of the 500 square arcmin field of view. To accurately and fast determine the position of the 1000 fibres a metrology system has been designed. This paper presents the hardware and software design and performance of the metrology system. The metrology system is based on the analysis of images taken by a circular array of 12 cameras located close to the VLTs derotator ring around the Nasmyth focus. The system includes 24 individually adjustable lamps. The fibre positions are measured through dedicated metrology targets mounted on top of the FPUs and fiducial markers connected to the FPU support plate which are imaged at the same time. A flexible pipeline based on VLT standards is used to process the images. The position accuracy was determined to ~5 μm in the central region of the images. Including the outer regions the overall positioning accuracy is ~25 μm. The MOONS metrology system is fully set up with a working prototype. The results in parts of the images are already excellent. By using upcoming hardware and improving the calibration it is expected to fulfil the accuracy requirement over the complete field of view for all metrology cameras.

Paper Details

Date Published: 9 August 2016
PDF: 10 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99088E (9 August 2016); doi: 10.1117/12.2232654
Show Author Affiliations
Holger Drass, Pontificia Univ. Católica de Chile (Chile)
Leonardo Vanzi, Pontificia Univ. Católica de Chile (Chile)
Miguel Torres-Torriti, Pontificia Univ. Católica de Chile (Chile)
Rolando Dünner , Pontificia Univ. Católica de Chile (Chile)
Tzu-Chiang Shen, Pontificia Univ. Católica de Chile (Chile)
Francisco Belmar, Pontificia Univ. Católica de Chile (Chile)
Lousie Dauvin, Pontificia Univ. Católica de Chile (Chile)
Tomás Staig, Pontificia Univ. Católica de Chile (Chile)
Jonathan Antognini, Pontificia Univ. Católica de Chile (Chile)
Mauricio Flores, Pontificia Univ. Católica de Chile (Chile)
Yerko Luco, Pontificia Univ. Católica de Chile (Chile)
Clémentine Béchet, Pontificia Univ. Católica de Chile (Chile)
David Boettger, Pontificia Univ. Católica de Chile (Chile)
Steven Beard, UK Astronomy Technology Ctr. (United Kingdom)
David Montgomery, UK Astronomy Technology Ctr. (United Kingdom)
Stephen Watson, UK Astronomy Technology Ctr. (United Kingdom)
Alexandre Cabral, Univ. de Lisboa (Portugal)
Mahmoud Hayati, Univ. de Lisboa (Portugal)
Manuel Abreu, Univ. de Lisboa (Portugal)
Phil Rees, UK Astronomy Technology Ctr. (United Kingdom)
Michele Cirasuolo, European Southern Observatory (Germany)
William Taylor, UK Astronomy Technology Ctr. (United Kingdom)
Alasdair Fairley, UK Astronomy Technology Ctr. (United Kingdom)


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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