Progress towards wind predictive control on ShaneAO: test bench results

Alexander R. Rudy; Srikar Srinath; Lisa Poyneer; S. Mark Ammons; Don Gavel; Renate Kupke; Darren Dillon; Constance Rockosi

doi:10.1117/12.2057194

21 July 2014 Progress towards wind predictive control on ShaneAO: test bench results

Alexander R. Rudy, Srikar Srinath, Lisa Poyneer, S. Mark Ammons, Don Gavel, Renate Kupke, Darren Dillon, Constance Rockosi

Author Affiliations +

Proceedings Volume 9148, Adaptive Optics Systems IV; 91481Z (2014) https://doi.org/10.1117/12.2057194
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

The identification and prediction of time-varying wavefront errors in adaptive optics (AO) systems promises fainter limiting guide star magnitudes and improved temporal bandwidth errors. In a new UCSC-LLNL collaboration, we aim to demonstrate the power of predictive Fourier controllers for AO in the laboratory and on-sky. We have used the Fourier Wind Identification technique to measure wind velocities at several telescopes, and now have demonstrated the identification of frozen flow turbulence with a translating phase screen on a laboratory test bench. Here, we present identification of the wind direction and velocity using telemetry data from a laboratory testbed simulating the ShaneAO system geometry. Our wind identification system uses a Fourier decomposition technique to identify the correlated movement of the atmosphere from WFS telemetry data, which are then used to construct a Kalman filter for real-time operation. We demonstrate the use of an LQG controller with the ShaneAO system architecture, and show that the effects of frozen flow turbulence can be easily identified in laboratory telemetry. We describe the adaptations made to the LQG controller to integrate it into the dual-DM architecture of the ShaneAO system, and demonstrate that these modifications produce stable and well-understood AO correction in the laboratory.

Citation Download Citation

Alexander R. Rudy, Srikar Srinath, Lisa Poyneer, S. Mark Ammons, Don Gavel, Renate Kupke, Darren Dillon, and Constance Rockosi "Progress towards wind predictive control on ShaneAO: test bench results", Proc. SPIE 9148, Adaptive Optics Systems IV, 91481Z (21 July 2014); https://doi.org/10.1117/12.2057194

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