Prediction control method to improve the dynamic performance of a close-loop adaptive optics system

Xin-yang Li; Qi Luo; Zhao-jun Yan

doi:10.1117/12.2235563

27 July 2016 Prediction control method to improve the dynamic performance of a close-loop adaptive optics system

Xin-yang Li, Qi Luo, Zhao-jun Yan

Proceedings Volume 9909, Adaptive Optics Systems V; 99094W (2016) https://doi.org/10.1117/12.2235563
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

The prediction control method can be used to reduce the dynamic performance of an adaptive optics system (AOS) correcting the wavefront distortion of atmosphere turbulence. Some researchers have proved this idea but usually in open-loop condition and based on the wavefront or sub-aperture gradients of wavefront sensors. It is difficult to predict wavefront distortion in close-loop. But nearly all AOS are running in close-loop in practice to reduce the nonlinear error of wavefront sensor and deformable mirror (DM). In this paper, two prediction methods were proposed to improve the dynamic performance of an AOS both in open-loop and in close-loop. In one method, the Recursive Least-Square (RLS) algorithm was used to calculate the prediction and control parameters of an AOS based on the voltages of DM with 61 actuators. In another method, the Lucas-Kanade optical flow method was used to estimate transverse wind speed and calculate the predicted voltages of DM with 127 actuators. Numerical simulations were carried out with dynamic atmosphere turbulence in different conditions. The residual wave-front error, the Strehl Ratio, and the power spectrum densities were calculated and compared between an AOS with and without the prediction method. The results show that the dynamic control performances of an AOS will be improved significantly by using prediction control methods.

Citation Download Citation

Xin-yang Li, Qi Luo, and Zhao-jun Yan "Prediction control method to improve the dynamic performance of a close-loop adaptive optics system", Proc. SPIE 9909, Adaptive Optics Systems V, 99094W (27 July 2016); https://doi.org/10.1117/12.2235563

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available