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8 August 2016 P-REx: the piston drift reconstruction experiment
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For sensitive infra-red long-baseline interferometry, it is crucial to control the differential piston between the apertures. Classically this is achieved with a fringe tracker which measures the movement of the interferometric fringes. In this paper, we describe a new method to reconstruct the piston variation introduced by atmospheric turbulence with real-time data from adaptive optics wave-front sensing. Concurrently, the dominant wind speed vector can also be retrieved. The method is analyzed in simulation for atmospheric turbulence of various strength, and wind vectors varying with layer altitude. The results from the simulations show that this method could help to reliably retrieve the piston variation and wind speed from wavefront sensor data. The method is related to concepts of predictive control AO algorithms and reconstruction of the point spread function.
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Jörg-Uwe Pott, Qiang Fu, Felix Widmann, and Diethard Peter "P-REx: the piston drift reconstruction experiment", Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 99073E (8 August 2016);

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