Dust contamination and in-situ cleaning of ground-based telescope optics: the VLT approach

Details Dust contamination and in-situ cleaning of ground-based telescope optics: the VLT approach Dust contamination and in-situ cleaning of ground-based telescope optics: the VLT approach

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spie.2871..416g&link_type=abstract

Proc. SPIE Vol. 2871, p. 416-423, Optical Telescopes of Today and Tomorrow, Arne L. Ardeberg; Ed.

Physics

1

Scientific paper

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.

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