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Proceedings Paper

Actuating the deformable mirror: a multiphysics design approach
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Paper Abstract

The crucial component of an Adaptive Optics unit is the actuation system of the deformable mirror. One possible implementation comprehends a linear force motor and a capacitive sensor providing the feedback measure signal. Due to the extreme accuracy required by the optics, a proper design of the actuator is essential in order to fulfill the specifications. In the device, mechanics, electrostatics, electromagnetism and thermal effects are mutually related, and they have to be properly considered in the design phase. This paper analyzes such a multiphysics behavior of the actuation system, providing an inter-disciplinary approach able to define the optimized device: a capacitive sensor measuring the displacements at the nanometer accuracy and a closed loop linear motor delivering the requested force with the lowest possible power dissipation, in order to minimize the degrading of the optical waves propagation.

Paper Details

Date Published: 23 July 2008
PDF: 11 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70181E (23 July 2008); doi: 10.1117/12.789001
Show Author Affiliations
Ciro Del Vecchio, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Roberto Biasi, Microgate SrL (Italy)
Daniele Gallieni, ADS International SrL (Italy)
Armando Riccardi, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Roberto Spairani, Solaria Engineering (Italy)


Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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