Analysis of large deflection zoom mirrors for the ESO Very Large Telescope Interferometer

Details Analysis of large deflection zoom mirrors for the ESO Very Large Telescope Interferometer Analysis of large deflection zoom mirrors for the ESO Very Large Telescope Interferometer

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...274...12f&link_type=abstract

Astronomy and Astrophysics, Vol. 274, p. 12 (1993)

Physics

Optics

2

Active Optics, Mirrors, Interferometry, Optical Design, Fourier Spectroscopy, Telescope Arrays

Scientific paper

A variable curvature mirror, i.e. a zoom mirror, is a powerful device that can increase the field of view of optical interferometers. Such a mirror is being developed for the European Southern Observatory for the Very Large Telescope Interferometer (VLTI) coherent combined focus. It will be the second mirror of the Cat's Eye of the delay line systems. It has been shown that zoom mirrors can be designed by using three possible configurations of external forces, all of these having an associated variable thickness distribution.
In this paper, the curvature of the proposed zoom mirrors is controlled by two possible loadings. Version 1 uses a uniform loading while version 2 uses a central force. Given the large zoom range required, an investigation has been carried out by an extension of the small deformation theory of elasticity. The problem that has been solved is based on a set of non-linear equations which are valid for the case of large deformations. These take into consideration the radial and tangential strains in the middle surface of the mirror. The mirror has a plane figure when not stressed. The thickness distribution of each version has been determined for an optimization of a convex figure at f12.5.

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