Computer Science
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3737..601g&link_type=abstract
Proc. SPIE Vol. 3737, p. 601-607, Design and Engineering of Optical Systems II, Fritz Merkle; Ed.
Computer Science
Scientific paper
Sometimes during a scientific data acquisition the focus of a telescope may change, especially for medium- and long-time exposures. This is mainly due to temperature changes inducing an expansion of the serrourier truss, and more generally, due to elastic structural flexures. Modelization and control of defocusing effect is an important topic in telescopes with great magnification ratio. In the Telescopio Nazionale Galileo case, a 3.5 meters class telescope located in La Palma island, a temperature change of 1 degree induces a 0.9 arcsec image blue. In such a case a control of defocus during an acquisition is essential to obtain sub-arcsec images, thus exploiting the site seeing. The secondary mirror of Galileo telescope is actively controlled via a hexapod actuator. Both systems, the hexapod secondary support and the control system, have been completed and tested at the telescope. The results show that positioning of the mirror is smooth enough, introducing an image movement of about 0.1 arcesc and allowing in such a way the on-line correction also during scientific operations.
Gardiol Daniele
Pernechele Claudio
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