Development status on the real-time controller for solar multi-conjugate adaptive optics system

Lin Kong; Lei Zhu; Changhui Rao

doi:10.1117/12.2243804

24 October 2016 Development status on the real-time controller for solar multi-conjugate adaptive optics system

Lin Kong, Lei Zhu, Changhui Rao

Proceedings Volume 9682, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 96820M (2016) https://doi.org/10.1117/12.2243804
Event: Eighth International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT2016), 2016, Suzhou, China

Abstract

Solar observations are performed over an extended field of view (FoV) and the isoplanatic patch which conventional adaptive optics (AO) provides diffraction limited resolution is a severe limitation. Multi-conjugate Adaptive Optics (MCAO) can be used to extend the corrected FoV of AO system. Compared to AO, MCAO which usually utilizes a wide-field Shack-Hartmann wavefront sensor to control multiple deformable mirrors(DMs) is more complicated. Because the Sun is an extended object, correlation algorithms are applied to detect gradients in solar MCAO system. Moreover, due to the fast evolving daytime seeing conditions and the fact that much science has to be done at visible wavelengths, a very high closed-loop bandwidth is also required. The computation and delay development of the real-time controller (RTC) in solar MCAO system is more challenging than that in night-time MCAO system. This paper reviews the solar MCAO techniques and systems in the world, especially emphasizes the framework and implementation of the RTC. The development of MCAO in China is also introduced. An outlook of the RTC for the solar MCAO system in development is given.

Citation Download Citation

Lin Kong, Lei Zhu, and Changhui Rao "Development status on the real-time controller for solar multi-conjugate adaptive optics system", Proc. SPIE 9682, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 96820M (24 October 2016); https://doi.org/10.1117/12.2243804

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KEYWORDS

Digital signal processing

Adaptive optics

Real-time computing

Field programmable gate arrays

Cameras

Reconstruction algorithms

Telescopes

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