Progress in Developing a Low-Cost Large Deformable Mirror
Författare
Summary, in English
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.
Avdelning/ar
Publiceringsår
2010
Språk
Engelska
Publikation/Tidskrift/Serie
Adaptive Optics Systems II
Volym
7736
Dokumenttyp
Konferensbidrag
Förlag
SPIE
Ämne
- Astronomy, Astrophysics and Cosmology
Conference name
Conference on Adaptive Optics Systems II
Conference date
2010-06-27 - 2010-07-02
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0277-786X
- ISSN: 1996-756X