Model-based wavefront control for CCAT

David Redding; John Z. Lou; Andy Kissil; Matt Bradford; Steve Padin; David Woody

doi:10.1117/12.916694

10 November 2011 Model-based wavefront control for CCAT

David Redding, John Z. Lou, Andy Kissil, Matt Bradford, Steve Padin, David Woody

Proceedings Volume 8336, Integrated Modeling of Complex Optomechanical Systems; 83360Q (2011) https://doi.org/10.1117/12.916694
Event: Integrated Modeling of Complex Optomechanical Systems, 2011, Kiruna, Sweden

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.

Citation Download Citation

David Redding, John Z. Lou, Andy Kissil, Matt Bradford, Steve Padin, and David Woody "Model-based wavefront control for CCAT", Proc. SPIE 8336, Integrated Modeling of Complex Optomechanical Systems, 83360Q (10 November 2011); https://doi.org/10.1117/12.916694

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