Highly variable curvature mirrors for the Very Large Telescope Interferometer

Details Highly variable curvature mirrors for the Very Large Telescope Interferometer Highly variable curvature mirrors for the Very Large Telescope Interferometer

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2201..811f&link_type=abstract

Proc. SPIE Vol. 2201, p. 811-820, Adaptive Optics in Astronomy, Mark A. Ealey; Fritz Merkle; Eds.

Physics

Optics

1

Scientific paper

The design of two holosteric configurations have been optimized for a maximum center/edge de-flexure 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.

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