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Proceedings Paper

Model-based wavefront control for CCAT
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Paper Abstract

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.

Paper Details

Date Published: 10 November 2011
PDF: 27 pages
Proc. SPIE 8336, Integrated Modeling of Complex Optomechanical Systems, 83360Q (10 November 2011); doi: 10.1117/12.916694
Show Author Affiliations
David Redding, Jet Propulsion Lab. (United States)
John Z. Lou, Jet Propulsion Lab. (United States)
Andy Kissil, Jet Propulsion Lab. (United States)
Matt Bradford, Jet Propulsion Lab. (United States)
Steve Padin, California Institute of Technology (United States)
David Woody, California Institute of Technology (United States)

Published in SPIE Proceedings Vol. 8336:
Integrated Modeling of Complex Optomechanical Systems
Torben Andersen; Anita Enmark, Editor(s)

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