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Proceedings Paper

Nonlinear control for pyramid sensors in adaptive optics
Author(s): Ole Wulff; Douglas Looze
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Paper Abstract

This paper presents a nonlinear modification of the standard linear adaptive optics controller that greatly reduces the startup lag due to saturation in pyramid wavefront sensors (or any wavefront sensor with 4-cell subapertures). Whenever the pyramid sensor is saturated (as determined by an internal model of the saturation in the controller), the deformable mirror signal is adjusted to quickly remove the saturation of the sensor. When the pyramid sensor is not saturated, a standard linear adaptive optics controller is used to generate the deformable mirror signal. The nonlinear controller is compared with a standard linear controller using a CAOS simulation. It is shown that the startup lag is significantly reduced, and that the steady-state performance is identical to the linear controller.

Paper Details

Date Published: 27 June 2006
PDF: 9 pages
Proc. SPIE 6272, Advances in Adaptive Optics II, 62721S (27 June 2006); doi: 10.1117/12.670826
Show Author Affiliations
Ole Wulff, Sikorsky Aircraft (United States)
Douglas Looze, Univ. of Massachusetts, Amherst (United States)


Published in SPIE Proceedings Vol. 6272:
Advances in Adaptive Optics II
Brent L. Ellerbroek; Domenico Bonaccini Calia, Editor(s)

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