Performance and improvement of active optics at the Very Large Telescope

Details Performance and improvement of active optics at the Very Large Telescope Performance and improvement of active optics at the Very Large Telescope

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4837..637g&link_type=abstract

Large Ground-based Telescopes. Edited by Oschmann, Jacobus M.; Stepp, Larry M. Proceedings of the SPIE, Volume 4837, pp. 637

Physics

Optics

Scientific paper

After the installation of the four Unit Telescopes of the VLT in the years 1998 till 2000 more than 1.5 million active optics measurements and corrections have been performed. Since all active optics data are logged together with various environmental parameters (external seeing, temperatures, wind, etc.) extensive statistical studies of the dependence of the optical performance of the telescope on the external parameters can be made. Improvements of the functionality and the performance of the telescopes include the use of a Kalman filter in the Active Optics correction loop and the possibility to adjust actively the plate scale of the telescope.

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