Share Email Print
cover

Proceedings Paper • new

Mechanisms in the GMT acquisition guiding and wavefront sensing system
Author(s): Daniel Catropa; Brian McLeod; Joseph D'Arco; Daniel Durusky; Jan Kansky; Derek Kopon; Kenneth McCracken; Stuart McMuldroch; William Podgorski; Antonin Bouchez
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

The Giant Magellan Telescope’s Acquisition, Guiding, and Wavefront Sensing System (AGWS) is comprised of four identical probes, each containing 11 axes of precision control. The largest of the mechanisms carries a mass of nearly 500kg. The mechanisms are diverse in type, including a voice coil actuated tip-tilt mirror, a rotary harmonic drive, high accuracy and precision lenslet rotation stages and ballscrew driven linear stages. To meet image quality, positioning, and tracking requirements, these mechanisms and their EtherCATcontrolled servos are designed for stiffness. Employing inductive tape encoders, they must position and track to 10um precision with minimal backlash, over velocities ranging from ~10mm/sec to essentially zero, where stiction becomes significant. We will present the designs of the mechanisms, highlighting key features, design trades, and preliminary prototyping results.

Paper Details

Date Published: 6 July 2018
PDF: 20 pages
Proc. SPIE 10700, Ground-based and Airborne Telescopes VII, 1070066 (6 July 2018); doi: 10.1117/12.2313981
Show Author Affiliations
Daniel Catropa, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Brian McLeod, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Joseph D'Arco, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Daniel Durusky, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Jan Kansky, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Derek Kopon, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Kenneth McCracken, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Stuart McMuldroch, Harvard-Smithsonian Ctr. for Astrophysics (United States)
William Podgorski, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Antonin Bouchez, GMTO Corp. (United States)


Published in SPIE Proceedings Vol. 10700:
Ground-based and Airborne Telescopes VII
Heather K. Marshall; Jason Spyromilio; Roberto Gilmozzi, Editor(s)

© SPIE. Terms of Use
Back to Top