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Proceedings Paper

Active optics system for the CTIO 4-m telescope
Author(s): German Schumacher; Jack Baldwin; Gabriel Perez; Eduardo Mondaca
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Paper Abstract

The 4 m telescope at Cerro Tololo Inter-American Observatory has recently been fitted with an active optics system. As with the NTT and other active-optics telescopes, coma is corrected by tilting the secondary mirror while the other low-order aberrations are removed by deforming the primary mirror. The modifications to the telescope include a new computer- controlled collimation/focus unit for the secondary mirror, and the conversion to active control of the 33 axial supports for the primary mirror. The system works quite well, in spite of having been built at low cost and having to deal with an `old technology' thick primary mirror. We describe here the hardware and software control approach, along with the first results following installation.

Paper Details

Date Published: 8 June 1995
PDF: 10 pages
Proc. SPIE 2479, Telescope Control Systems, (8 June 1995); doi: 10.1117/12.211448
Show Author Affiliations
German Schumacher, Cerro Tololo Inter-American Observatory (Chile)
Jack Baldwin, Cerro Tololo Inter-American Observatory (Chile)
Gabriel Perez, Cerro Tololo Inter-American Observatory (Chile)
Eduardo Mondaca, Cerro Tololo Inter-American Observatory (Chile)

Published in SPIE Proceedings Vol. 2479:
Telescope Control Systems
Patrick T. Wallace, Editor(s)

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