Stability margin loss due to wavefront sensor misregistration: amelioration with spatial filtering techniques

Terry J. Brennan

doi:10.1117/12.438179

4 September 2001 Stability margin loss due to wavefront sensor misregistration: amelioration with spatial filtering techniques

Terry J. Brennan

Author Affiliations +

Proceedings Volume 4376, Laser Weapons Technology II; (2001) https://doi.org/10.1117/12.438179
Event: Aerospace/Defense Sensing, Simulation, and Controls, 2001, Orlando, FL, United States

Abstract

A phase reconstructor for an adaptive optics system depends on a model of the response of commands to the deformable mirror in the gradient sensor. Errors in this model may be due to actuator/sensor misregistration. The level of misregistration which produces closed loop instability is calculated for several systems (2 X 2, 4 X 4, and 15 X 15 subapertures). Depending on the servo law, the 15 X 15 system may be stable for misregistration up to 17% of a subaperture but loses 30 degrees of phase margin at 5%. The effects of system size, servo bandwidth, latency, and actuator slaving are illustrated. It is also shown that spatially filtering the reconstructed phase can dramatically reduce the sensitivity to misregistration.

Citation Download Citation

Terry J. Brennan "Stability margin loss due to wavefront sensor misregistration: amelioration with spatial filtering techniques", Proc. SPIE 4376, Laser Weapons Technology II, (4 September 2001); https://doi.org/10.1117/12.438179

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