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Model-based wavefront control for CCAT

Redding, David and Lou, John Z. and Kissil, Andy and Bradford, Matt and Padin, Steve and Woody, David (2011) Model-based wavefront control for CCAT. In: Integrated Modeling of Complex Optomechanical Systems. Proceedings of SPIE. No.8336. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 83360Q. ISBN 9780819489937.

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The 25-m aperture CCAT submillimeter-wave telescope will have a primary mirror that is divided into 162 individual segments, each of which is provided with 3 positioning actuators. CCAT will be equipped with innovative Imaging Displacement Sensors (IDS) - inexpensive optical edge sensors - capable of accurately measuring all segment relative motions. These measurements are used in a Kalman-filter-based Optical State Estimator to estimate wavefront errors, permitting use of a minimum-wavefront controller without direct wavefront measurement. This controller corrects the optical impact of errors in 6 degrees of freedom per segment, including lateral translations of the segments, using only the 3 actuated degrees of freedom per segment. The edge sensors do not measure the global motions of the Primary and Secondary Mirrors. These are controlled using a gravity-sag look-up table. Predicted performance is illustrated by simulated response to errors such as gravity sag.

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Additional Information:© 2011 Society of Photo-optical Instrumentation Engineers (SPIE). This research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
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Subject Keywords:Segmented mirror, wavefront control, edge sensors, Kalman filter
Series Name:Proceedings of SPIE
Issue or Number:8336
Record Number:CaltechAUTHORS:20180717-124829154
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Official Citation:David Redding, John Z. Lou, Andy Kissil, Matt Bradford, Steve Padin, David Woody, "Model-based wavefront control for CCAT", Proc. SPIE 8336, Integrated Modeling of Complex Optomechanical Systems, 83360Q (10 November 2011); doi: 10.1117/12.916694;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87926
Deposited By: Tony Diaz
Deposited On:17 Jul 2018 21:34
Last Modified:03 Oct 2019 20:01

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