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Proceedings Paper

Parallel robots in a ground-based telescope active optics system: theory and experiments
Author(s): P. Schipani; L. Ferragina; L. Marty; A. Grado; L. Di Fiore; R. De Rosa; A. La Rana; A. Busatta
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Paper Abstract

This work deals with the application of parallel robots for the correction of defocus and coma optical aberrations in the case study of the VST (VLT Survey Telescope) telescope, to be installed at the ESO observatory of Cerro Paranal (Chile). The parallel robots are used to change position and orientation of the secondary mirror. The secondary mirror positioning capability is a fundamental part in an active optics system, i.e. a closed loop control system for the minimization of the telescope optical aberrations, where the outer optical feedback coming from the wavefront sensor is used to generate references for the inner motion control loop of the secondary mirror positioning robots. Two devices are presented: a 6-6 Stewart platform where both fixed and mobile platforms are regular and similar hexagons whose vertexes belong to the same plane and are on a circle, and a two stages device composed by a XY table plus a tilt platform. The basic theory of active optics corrections is presented. The kinematics of both devices is solved in connection with the active optics application; first test data are presented.

Paper Details

Date Published: 10 October 2007
PDF: 9 pages
Proc. SPIE 6715, Optomechatronic Actuators and Manipulation III, 671503 (10 October 2007); doi: 10.1117/12.754172
Show Author Affiliations
P. Schipani, INAF, Osservatorio Astronomico di Capodimonte (Italy)
L. Ferragina, INAF, Osservatorio Astronomico di Capodimonte (Italy)
L. Marty, INAF, Osservatorio Astronomico di Capodimonte (Italy)
A. Grado, INAF, Osservatorio Astronomico di Capodimonte (Italy)
L. Di Fiore, INFN (Italy)
R. De Rosa, Univ. degli Studi di Napoli Federico II (Italy)
A. La Rana, Univ. degli Studi di Napoli Federico II (Italy)
A. Busatta, European Industrial Engineering (Italy)

Published in SPIE Proceedings Vol. 6715:
Optomechatronic Actuators and Manipulation III
Yves Bellouard; Yukitoshi Otani; Kee S. Moon, Editor(s)

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