Progress in Developing a Low-Cost Large Deformable Mirror

Rikard Heimsten, Douglas G. MacMynowski, Torben Andersen

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

1 Citation (SciVal)


Large (> 1m) deformable mirrors with hundreds or thousands of actuators are attractive for extremely large telescopes. Use of force actuators coupled to the mirror via suction cups, and electret microphones for position sensing, has the potential of substantially reducing costs. However, a mirror controlled with force actuators will have many structural resonances within the desired system bandwidth, shifting the emphasis somewhat of the control aspects. Local velocity and position loop for each actuator can add significant damping, but gives poor performance at high spatial frequencies. We therefore introduce a novel control strategy with many parallel "actuator families", each controlled by single-input-single-output controllers. This family approach provides performance close to that of global control, but without the accompanying robustness challenges. Using a complete simulation model of a representative large deformable mirror, we demonstrate feasibility of the approach. This paper describes the challenges of non-ideal actuators and sensors. The results presented give an understanding of the required actuator bandwidth and the effects of the sensors dynamics. The conclusion is that the introduction of actuator and sensor dynamics does not limit the control system of the deformable mirror.
Original languageEnglish
Title of host publicationAdaptive Optics Systems II
Publication statusPublished - 2010
EventConference on Adaptive Optics Systems II - San Diego, CA
Duration: 2010 Jun 272010 Jul 2

Publication series

ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceConference on Adaptive Optics Systems II

Subject classification (UKÄ)

  • Astronomy, Astrophysics and Cosmology


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