Low-order adaptive optics compensation for a low-contrast extended object

2002 ◽  
Author(s):  
Changhui Rao ◽  
Wenhan Jiang
Keyword(s):  
Adaptive Optics ◽  
Low Contrast ◽  
Extended Object ◽  
Low Order

The Design of Large Array Solar Adaptive Optics Electronic System for Observation of Low Contrast Extended Object

2011 ◽  
Vol 32 (12) ◽  
pp. 2987-2992
Author(s):  
Wei-wei Fei ◽  
Chang-qing Wang ◽  
Pu-kun Liu ◽  
Hui-zhi Cai ◽  
Ai-min Jiang ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Electronic System ◽  
Large Array ◽  
Low Contrast ◽  
Extended Object

scholarly journals Modeling low order aberrations in laser guide star adaptive optics systems

2007 ◽  
Vol 15 (8) ◽  
pp. 4711 ◽  
Author(s):  
Richard M. Clare ◽  
Marcos A. van Dam ◽  
Antonin H. Bouchez
Keyword(s):  
Adaptive Optics ◽  
Laser Guide Star ◽  
Guide Star ◽  
Laser Guide ◽  
Low Order

Development of a low-order Adaptive Optics system at Udaipur Solar Observatory

2008 ◽  
Vol 29 (1-2) ◽  
pp. 353-357 ◽  
Author(s):  
A. R. Bayanna ◽  
B. Kumar ◽  
R. E. Louis ◽  
P. Venkatakrishnan ◽  
S. K. Mathew
Keyword(s):  
Adaptive Optics ◽  
Solar Observatory ◽  
Adaptive Optics System ◽  
Low Order

Real time controller for 37-element low-order solar adaptive optics system at 1m new vacuum solar telescope

2012 ◽  
Author(s):  
Lei Zhu ◽  
Naiting Gu ◽  
Shanqiu Chen ◽  
Lanqiang Zhang ◽  
Xiaoyun Wang ◽  
...  
Keyword(s):  
Real Time ◽  
Adaptive Optics ◽  
Solar Telescope ◽  
Adaptive Optics System ◽  
Low Order

Extended Object Imaging Correction for Model-Based Wavefront Sensorless Adaptive Optics System Under Noise

2019 ◽  
Vol 46 (4) ◽  
pp. 0405003
Author(s):  
马良 Ma Liang ◽  
徐奇 Xu Qi ◽  
吴阳 Wu Yang ◽  
杨慧珍 Yang Huizhen ◽  
杨海波 Yang Haibo ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Model Based ◽  
Extended Object ◽  
Adaptive Optics System ◽  
Object Imaging

scholarly journals On-sky results for adaptive optics control with data-driven models on low-order modes

2020 ◽  
Vol 498 (3) ◽  
pp. 3228-3240
Author(s):  
Baptiste Sinquin ◽  
Léonard Prengère ◽  
Caroline Kulcsár ◽  
Henri-François Raynaud ◽  
Eric Gendron ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
High Performance ◽  
Temporal Dynamics ◽  
Data Driven ◽  
Linear Quadratic ◽  
Linear Quadratic Gaussian ◽  
Integral Action ◽  
High Performance Systems ◽  
Performance Results ◽  
Low Order

ABSTRACT Dedicated tip–tilt loops are commonly implemented on adaptive optics (AO) systems. In addition, a number of recent high-performance systems feature tip–tilt controllers that are more efficient than the integral action controller. In this context, linear–quadratic–Gaussian (LQG) tip–tilt regulators based on stochastic models identified from AO telemetry have demonstrated their capacity to effectively compensate for the cumulated effects of atmospheric disturbance, windshake and vibrations. These tip–tilt LQG regulators can also be periodically retuned during AO operations, thus allowing to track changes in the disturbances’ temporal dynamics. This paper investigates the potential benefit of extending the number of low-order modes to be controlled using models identified from AO telemetry. The global stochastic dynamical model of a chosen number of turbulent low-order modes is identified through data-driven modelling from wavefront sensor measurements. The remaining higher modes are modelled using priors with autoregressive models of order 2. The loop is then globally controlled using the optimal LQG regulator build from all these models. Our control strategy allows for combining a dedicated tip–tilt loop with a deformable mirror that corrects for the remaining low-order modes and for the higher orders altogether, without resorting to mode decoupling. Performance results are obtained through evaluation of the Strehl ratio computed on H-band images from the scientific camera, or in replay mode using on-sky AO telemetry recorded in 2019 July on the CANARY instrument.

Sign in / Sign up

Export Citation Format

Share Document