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Proceedings Paper

Highly variable curvature mirrors for the Very Large Telescope Interferometer
Author(s): Marc Ferrari; Gerard R. Lemaitre; Silvio P. Mazzanti; Oskar von der Luehe; Bernard di Biagio; Pierre Montiel; Daniel Revest; Patrice Joulie; Jean-Francois Carre
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Paper Abstract

The design of two holosteric configurations have been optimized for a maximum center/edge deflexure of 400 micrometers . Their thickness distribution is given for active zones of 16 mm in diameter. The curvature action is obtained from an air-pressure chamber that generates onto the rear side of the mirrors (1) a uniform pressure up to 9 Atm or (2) a central force up to 11 daN. The control of the curvature is made by an accurate pressure gauge. Some preliminary results are shown as obtained on metal prototype VCMs from a first fabrication cycle as well as an X-ray device for testing the machining validity of the boundaries at the edge of mirrors.

Paper Details

Date Published: 31 May 1994
PDF: 10 pages
Proc. SPIE 2201, Adaptive Optics in Astronomy, (31 May 1994); doi: 10.1117/12.176116
Show Author Affiliations
Marc Ferrari, Observatoire de Marseille (France)
Gerard R. Lemaitre, LOOM/Observatoire de Marseille (France)
Silvio P. Mazzanti, LOOM/Observatoire de Marseille (France)
Oskar von der Luehe, European Southern Observatory (Germany)
Bernard di Biagio, LOOM/Observatoire de Marseille (France)
Pierre Montiel, LOOM/Observatoire de Marseille (France)
Daniel Revest, LOOM/Observatoire de Marseille (France)
Patrice Joulie, LOOM/Observatoire de Marseille (France)
Jean-Francois Carre, Societe Europeenne des Systemes Optiques (France)

Published in SPIE Proceedings Vol. 2201:
Adaptive Optics in Astronomy
Mark A. Ealey; Fritz Merkle, Editor(s)

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