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Proceedings Paper

Performance of the VST secondary mirror support system
Author(s): Pietro Schipani; Sergio D'Orsi; Davide Fierro; Laurent Marty; Francesco Perrotta; Carmelo Arcidiacono
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Paper Abstract

The VST telescope is equipped with an active optics system based on a wavefront sensor, a set of axial actuators to change the primary mirror shape and a secondary mirror positioner stage. The secondary mirror positioning capability allows the correction of defocus and coma, caused by incorrect relative positions of the two mirrors arising from the deformation of the telescope tube and of the optical train under the effect of gravity and thermal espansion. Periodically the image analyser calculates the deviation of the image from the best quality and the telescope control software decomposes the deviation into the single optical contributions. The new position and orientation of the secondary mirror is computed by the telescope control software and transmitted to the secondary mirror support system for execution. The secondary mirror positioner is a hexapod, i.e. a parallel robot with a mobile platform moved by six linear actuators acting simultaneously. This paper describes the secondary mirror support system and the qualification test campaign performed both in laboratory and at the telescope.

Paper Details

Date Published: 22 July 2010
PDF: 9 pages
Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 773932 (22 July 2010); doi: 10.1117/12.856606
Show Author Affiliations
Pietro Schipani, INAF, Osservatorio Astronomico di Capodimonte (Italy)
Sergio D'Orsi, INAF, VSTCeN (Italy)
Davide Fierro, INAF, VSTCeN (Italy)
Laurent Marty, INAF, VSTCeN (Italy)
Francesco Perrotta, INAF, Osservatorio Astronomico di Capodimonte (Italy)
Carmelo Arcidiacono, INAF, Osservatorio Astrofisico di Arcetri (Italy)

Published in SPIE Proceedings Vol. 7739:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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