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Concept, modeling, and performance prediction of a low-cost, large deformable mirror

Heimsten, Rikard LU ; MacMynowski, Douglas G.; Andersen, Torben LU and Owner-Petersen, Mette LU (2012) In Applied Optics 51(5). p.515-524
Abstract
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... (More)
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 (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Optics
volume
51
issue
5
pages
515 - 524
publisher
OSA
external identifiers
  • wos:000300605300001
  • scopus:84856890284
ISSN
2155-3165
DOI
10.1364/AO.51.000515
language
English
LU publication?
yes
id
d1df6d24-adf7-46c2-a060-f68e7107da79 (old id 2390978)
date added to LUP
2012-03-27 14:42:45
date last changed
2017-01-01 04:07:48
@article{d1df6d24-adf7-46c2-a060-f68e7107da79,
  abstract     = {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},
  author       = {Heimsten, Rikard and MacMynowski, Douglas G. and Andersen, Torben and Owner-Petersen, Mette},
  issn         = {2155-3165},
  language     = {eng},
  number       = {5},
  pages        = {515--524},
  publisher    = {OSA},
  series       = {Applied Optics},
  title        = {Concept, modeling, and performance prediction of a low-cost, large deformable mirror},
  url          = {http://dx.doi.org/10.1364/AO.51.000515},
  volume       = {51},
  year         = {2012},
}