Torben Andersen
Professor emeritus (Leave of Absence)
Concept, modeling, and performance prediction of a low-cost, large deformable mirror
Author
Summary, in English
While it is attractive to integrate a deformable mirror (DM) for adaptive optics (AO) into the telescope itself rather than using relay optics within an instrument, the resulting large DM can be expensive, particularly for extremely large telescopes. A low-cost approach for building a large DM is to use voice-coil actuators connected to the back of the DM through suction cups. Use of such inexpensive voice-coil actuators leads to a poorly damped system with many structural modes within the desired bandwidth. Control of the mirror dynamics using electro-mechanical sensors is thus required for integration within an AO system. We introduce a distributed control approach, and we show that the "inner" back sensor control loop does not need to function at low frequencies, leading to significant cost reduction for the sensors. Incorporating realistic models of low-cost actuators and sensors together with an atmospheric seeing model, we demonstrate that the low-cost mirror strategy is feasible within a closed-loop AO system. (C) 2012 Optical Society of America
Department/s
- Lund Observatory - Has been reorganised
Publishing year
2012
Language
English
Pages
515-524
Publication/Series
Applied Optics
Volume
51
Issue
5
Full text
- Available as PDF - 879 kB
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Document type
Journal article
Publisher
Optical Society of America
Topic
- Physical Sciences
Status
Published
ISBN/ISSN/Other
- ISSN: 2155-3165