Implementation and performance of the metrology system for the multi-object optical and near-infrared spectrograph MOONS

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 II; Michele Cirasuolo; William Taylor; Alasdair Fairley

doi:10.1117/12.2232654

9 August 2016 Implementation and performance of the metrology system for the multi-object optical and near-infrared spectrograph MOONS

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 II, Michele Cirasuolo, William Taylor, Alasdair Fairley

Author Affiliations +

Proceedings Volume 9908, Ground-based and Airborne Instrumentation for Astronomy VI; 99088E (2016) https://doi.org/10.1117/12.2232654
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

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.

Citation Download Citation

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 II, Michele Cirasuolo, William Taylor, and Alasdair Fairley "Implementation and performance of the metrology system for the multi-object optical and near-infrared spectrograph MOONS", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99088E (9 August 2016); https://doi.org/10.1117/12.2232654

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
10 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Metrology

Cameras

Calibration

Spectrographs

Electroluminescent displays

Target detection

Astronomical imaging

Show All Keywords

Keywords/Phrases

Search In:

Publication Years