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Proceedings Paper

Position control for active secondary mirror of a two-mirror telescope
Author(s): Claudio Pernechele; Fabio Bortoletto; Klaus Reif
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Paper Abstract

In an aplanatic two mirror telescope, spherical and coma aberrations may be introduced if a misalignment of the secondary mirror is present. That misalignment may be intrinsic to telescope, due to small errors in optical design or manufacturing; however it will always be present during the life of the telescope, due to maintenance errors, thermal distortions of the mirror and the structure, mechanical distortions of the mirror mount, mechanical arrangement of the structure and other. An active control of the secondary mirror, allowing free positioning of the secondary, is important to correct such unwanted effects. The Italian Galileo National Telescope is equipped with a secondary mirror supported by an 'hexapod' structure, allowing a complete positioning control. In this paper a strategy for handling the positioning and movement of the exapod support of a secondary mirror will be investigated from two point of view: an analytical and a neural network approach.

Paper Details

Date Published: 18 September 1997
PDF: 9 pages
Proc. SPIE 3112, Telescope Control Systems II, (18 September 1997); doi: 10.1117/12.278821
Show Author Affiliations
Claudio Pernechele, Astronomical Observatory of Padua (Italy)
Fabio Bortoletto, Astronomical Observatory of Padua (Italy)
Klaus Reif, Univ. of Bonn (Germany)


Published in SPIE Proceedings Vol. 3112:
Telescope Control Systems II
Hilton Lewis, Editor(s)

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