Real-time reconstructor for adaptive secondary control of the 6.5-m single-mirror MMT

Steven M. Stahl; Todd K. Barrett; David G. Sandler

doi:10.1117/12.217739

25 August 1995 Real-time reconstructor for adaptive secondary control of the 6.5-m single-mirror MMT

Steven M. Stahl, Todd K. Barrett, David G. Sandler

Proceedings Volume 2534, Adaptive Optical Systems and Applications; (1995) https://doi.org/10.1117/12.217739
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

We describe the proposed real-time reconstructor algorithm and hardware design for the planned 6.5 m MMT monolithic primary upgrade. The real-time reconstructor will use a linear matrix multiply to calculate the command values to be applied to the actuators of an adaptive secondary mirror using input data from a Shack-Hartmann type wavefront sensor which samples the atmospheric turbulence. Each mirror actuator will be controlled by a high- speed inner control-loop which uses capacitive position sensors located at each actuator as feedback. The real-time reconstructor algorithm is designed to take advantage of the presence of this inner control-loop to achieve better overall correction of the atmospheric aberration. The reconstructor design also provides the ability to use wave-front sensor measurements obtained in previous cycles as part of the input vector in the reconstruction algorithm. The real-time reconstructor hardware uses commercially available hardware to implement the reconstruction algorithm at high bandwidths and small latencies.

Citation Download Citation

Steven M. Stahl, Todd K. Barrett, and David G. Sandler "Real-time reconstructor for adaptive secondary control of the 6.5-m single-mirror MMT", Proc. SPIE 2534, Adaptive Optical Systems and Applications, (25 August 1995); https://doi.org/10.1117/12.217739

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