Real-time open-loop control of a 1024-actuator MEMS deformable mirror

Célia Blain; Rodolphe Conan; Colin Bradley; Olivier Guyon; Darryl Gamroth; Reston Nash

doi:10.1117/12.856589

14 July 2010 Real-time open-loop control of a 1024-actuator MEMS deformable mirror

Célia Blain, Rodolphe Conan, Colin Bradley, Olivier Guyon, Darryl Gamroth, Reston Nash

Proceedings Volume 7736, Adaptive Optics Systems II; 77364L (2010) https://doi.org/10.1117/12.856589
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

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.

Citation Download Citation

Célia Blain, Rodolphe Conan, Colin Bradley, Olivier Guyon, Darryl Gamroth, and Reston Nash "Real-time open-loop control of a 1024-actuator MEMS deformable mirror", Proc. SPIE 7736, Adaptive Optics Systems II, 77364L (14 July 2010); https://doi.org/10.1117/12.856589

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