Browsing by Author "Castro Romero, Mario Andres"

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CONTROL DE PERTURBACIONES DE ALTA FRECUENCIA DE TIP Y TILT EN SISTEMAS ÓPTICOS USANDO FAST STEERING MIRROR
(2016) Castro Romero, Mario Andres; Departamento de Electrónica; Escarate Monetta, Pedro Antonio
The Adaptive Optics (AO) technology was conceived for the improvement in the astronomicalimages adquired by the optical telescopes via the compensation of atmosphericalturbulence. With the development of the associated technology, the AO allowed us to obtainimages near the physical difraction limit. Once the AO achieved succesfully the compensationof atmospheric turbulence, other problems gain more importance, being the mostimportant the problem of the vibrations in the optical system, produced by a number offactors that most of the time are dicult to establish. These structural vibrations induceaberration 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 tiptiltmodes using closed-loop control, inducing vibration on the test bench via an eccentricmotor with controllable frequency, in order to simulate the structural vibrations mentionedabove. We measure the laser vibration and its tip-tilt aberration using a CMOS camera.The control action is carried out by a Fast Steering Mirror (FSM).