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Lego Figure holding a lego telescope. Photo

Arne Ardeberg

Professor emeritus

Lego Figure holding a lego telescope. Photo

Novel concept for large deformable mirrors

Author

  • Torben Andersen
  • Olof Garpinger
  • Mette Owner-Petersen
  • Fredrik Bjoorn
  • Roger Svahn
  • Arne Ardeberg

Summary, in English

Large, high-bandwidth deformable mirrors (DMs) with thousands of actuators for adaptive optics are of high interest for existing large telescopes and indispensable for construction of efficient future extremely large telescopes. Different actuation and sensing principles are possible. We propose a novel concept using commercially available voice coil actuators attached to the back of the mirror with suction cups and using LVDT sensors on the actuators for local stabilization. Also, a new low-cost sensor for easy measurement of DM displacement or velocity has been developed. It has a sensitivity better than 20 nm and a bandwidth wider than 20 to 1000 Hz. Finally, studies are in progress of global, hierarchical mirror form controllers based on many parallel multiple-input, multiple-output regulators of low order.

Department/s

  • Lund Observatory - Has been reorganised
  • Department of Automatic Control

Publishing year

2006

Language

English

Publication/Series

Optical Engineering

Volume

45

Issue

7

Document type

Journal article

Publisher

SPIE

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • actuators
  • mirrors
  • adaptive optics
  • active optics
  • wavefront
  • telescopes
  • compensation

Status

Published

ISBN/ISSN/Other

  • ISSN: 0091-3286