Controlled Bending of a Thin Mirror to Regain Figure after Warping due to Edge-Cutting

Details Controlled Bending of a Thin Mirror to Regain Figure after Warping due to Edge-Cutting Controlled Bending of a Thin Mirror to Regain Figure after Warping due to Edge-Cutting

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.243..177h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 243, NO.2/MAR15, P. 177, 1990

Astronomy and Astrophysics

Astronomy

Scientific paper

A thin circular Cer-Vit mirror, diameter 1.3 m, that had been polished flat was cut along 10 edges to form a 12-sided pseudo-elliptical plate. As a result of the edge-cutting, the mirror distorted and an experiment that investigated the effect of reverse stressing to counteract the distortion is described and analysed. The configuration adopted for stressing the mirror when installed as a driven coudé flat in the UK Infrared Telescope is also described. The reverse stressing results can be understood in terms of thin plate theory for pure bending and, in general, if the distortion is toroidal (including the case of a sphere) an orthogonal pair of bending moments can be chosen that will remove the undesired curvatures.

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