27 July 2016 Closed-loop control for tip-tilt compensation on systems under vibration
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Abstract
Mechanical vibrations affect the performance in modern adaptive optics systems. These structural vibrations induce aberration mainly in tip-tilt modes that reduce the accuracy of the astronomical instrument. Therefore, control actions need to be taken. With this purpose we present a laboratory demonstration of vibration rejection of tip-tilt modes using closed-loop control, inducing vibration on the test bench via an eccentric motor with controllable frequency, in order to simulate the structural vibrations mentioned above. We measure the laser vibration and its tip-tilt aberration using a camera and a Shack Hartmann Wave Front Sensor. The control action is carried out by a Fast Steering Mirror (FSM).
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Mario Castro, Pedro Escárate, Javier Garcés, Sebastián Zúñiga, Diego Rojas, José Marchioni, Andrés Guesalaga, "Closed-loop control for tip-tilt compensation on systems under vibration", Proc. SPIE 9909, Adaptive Optics Systems V, 99093K (27 July 2016); doi: 10.1117/12.2232215; https://doi.org/10.1117/12.2232215
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