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18 July 2018 Analysis of AO modeling for pseudo-synthetic interaction matrix at the LBT
Cedric T. Heritier, Simone Esposito, Thierry Fusco, Benoit Neichel, Sylvain Oberti, Enrico Pinna, Guido Agapito, Alfio Puglisi, Runa Briguglio, Carlos Correia, Pierre-Yves Madec, Jean-François Sauvage, Johann Kolb, Fernando Quiros-Pacheco
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Proceedings Volume 10703, Adaptive Optics Systems VI; 107034P (2018) https://doi.org/10.1117/12.2311675
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States
Abstract
The performance of an Adaptive Optics (AO) System relies on the accuracy of its Interaction Matrix which defines the opto-geometrical link between the Deformable Mirror (DM) and the Wave Front Sensor (WFS). Any mis-registrations (relative shifts, rotation, magnification or higher order pupil distortion) will strongly impact the performance, especially for high orders AO systems. Adaptive Telescopes provide a constraining environment for the AO calibration with large number of actuators DM, located inside the telescope with often no access to a calibration source and with a high accuracy required. The future Extremely Large Telescope (ELT) will take these constraints to another level with a longer calibration time required, no artificial calibration source and most of all, frequent updates of the calibration during the operation. To overcome these constraints, new calibration strategies have to be developed either doing it on-sky or working with synthetic models. The most promising approach seems to be the Pseudo-Synthetic Calibration. The principle is to generate the Interaction Matrix of the system in simulator, injecting the correct model alignment parameters identified from on-sky Measurements. It is currently the baseline for the Adaptive Optics Facility (AOF) at the Very Large Telescope (VLT) working with a Shack-Hartmann WFS but it remains to be investigated in the case of the Pyramid WFS.
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Cedric T. Heritier, Simone Esposito, Thierry Fusco, Benoit Neichel, Sylvain Oberti, Enrico Pinna, Guido Agapito, Alfio Puglisi, Runa Briguglio, Carlos Correia, Pierre-Yves Madec, Jean-François Sauvage, Johann Kolb, and Fernando Quiros-Pacheco "Analysis of AO modeling for pseudo-synthetic interaction matrix at the LBT", Proc. SPIE 10703, Adaptive Optics Systems VI, 107034P (18 July 2018); https://doi.org/10.1117/12.2311675
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KEYWORDS
Calibration
Adaptive optics
Telescopes
Actuators
Data modeling
Space telescopes
Systems modeling
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