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Proceedings Paper

Dust contamination and in-situ cleaning of ground-based telescope optics: the VLT approach
Author(s): Paul Giordano
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Paper Abstract

It seems to be a fundamental law of nature that optical surfaces become dirty. On-site contamination has been recorded at the ESO La Silla Observatory and at the VLT site over a period of six years. Measured data are presented, and the efforts made at ESO since 1990 to define suitable on-line monitoring and preventive maintenance are detailed. In-situ cleaning techniques, existing equipment and procedures are reviewed. Emphasis is put on the carbon-dioxide snowflake cleaning technique and the integrated cleaning device of the 3.5 m NTT telescope is described. The preliminary cleaning and protection test conducted on the first finished 8 m mirror at the optical manufacturer's site is presented as well, and plans for the in-situ cleaning of the VLT mirrors are explained.

Paper Details

Date Published: 21 March 1997
PDF: 8 pages
Proc. SPIE 2871, Optical Telescopes of Today and Tomorrow, (21 March 1997); doi: 10.1117/12.269065
Show Author Affiliations
Paul Giordano, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 2871:
Optical Telescopes of Today and Tomorrow
Arne L. Ardeberg, Editor(s)

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