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Proceedings Paper

Real-time open-loop control of a 1024-actuator MEMS deformable mirror
Author(s): Célia Blain; Rodolphe Conan; Colin Bradley; Olivier Guyon; Darryl Gamroth; Reston Nash
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Paper Abstract

This article reports the progress made at the University of Victoria AO Lab, regarding the realtime open-loop control of a 1024-actuator MEMS deformable mirror (DM). The setup is an hybrid woofer-tweeter/open-loop bench. A tip-tilt mirror and a woofer DM (a 57-actuator CILAS DM) are driven in closed-loop while a 1024-actuator MEMS DM is utilized on a parallel open-loop path. Previous work shows that open-loop control providing low residual error (with frozen Kolmogorov turbulence) can be obtained without the need of DM modelling. A preliminary methodical calibration of the DM is employed instead. The MEMS electronics were upgraded to an update rate of 500 Hz and the experiment lays the groundwork for showing how these performances can also be achieved on the bench with dynamic turbulence (created with custom hot air turbulence generators). The current status of the experiment and the next milestones are presented.

Paper Details

Date Published: 14 July 2010
PDF: 10 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 77364L (14 July 2010); doi: 10.1117/12.856589
Show Author Affiliations
Célia Blain, Univ. of Victoria (Canada)
Rodolphe Conan, Univ. of Victoria (Canada)
Colin Bradley, Univ. of Victoria (Canada)
Olivier Guyon, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Darryl Gamroth, Univ. of Victoria (Canada)
Reston Nash, Univ. of Victoria (Canada)


Published in SPIE Proceedings Vol. 7736:
Adaptive Optics Systems II
Brent L. Ellerbroek; Michael Hart; Norbert Hubin; Peter L. Wizinowich, Editor(s)

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