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Model-based wavefront control for CCAT

Show simple item record Redding, David Lou, John Z. Kissil, Andy Bradford, Matt Padin, Steve Woody, David 2013-09-09T16:14:30Z 2013-09-09T16:14:30Z 2011-08-15
dc.identifier.citation Symposium on Integrated Modeling of Complex Optomechanical Systems, Kiruna, Sweden, August 15-17, 2011 en_US
dc.identifier.clearanceno 11-4062
dc.description.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 global motions of the Primary and Secondary Mirrors are not measured by the edge sensors. These are controlled using a gravity-sag look-up table. Predicted performance is illustrated by simulated response to errors such as gravity sag. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2011. en_US
dc.subject submillimeter wave telescope en_US
dc.subject segmented mirrors en_US
dc.subject wavefromt control en_US
dc.subject edge sensor en_US
dc.subject Kalman filter en_US
dc.title Model-based wavefront control for CCAT en_US
dc.type Preprint en_US

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