Share Email Print
cover

Proceedings Paper

Method to minimize the gravity sag of a facing ground Φ1m flat mirror
Author(s): Yongwei Guo; Xuedong Gu; Shimo Yang
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

A method for minimizing the optical distortion from gravity sag on a suspended and autocollimated flat mirror facing ground has been proposed in the paper. Referring to this method, a mechanism consisting of 18 pulleys and weight sets unloads the gravity of the Φ1m flat mirror the alignment and testing benchmark of the 1m aperture optical system of the Space Solar Telescope (SST). Three positioning points support the mirror, allow the mirror to be held or suspended above an object to be viewed steadily and reliably. 18 pulling points on the back of the mirror unload the mirror's weight. The bonded joints of these 18 points are analyzed and tested to be reliable, and can bear the affection of variation of temperature and inner stress. The manufacturing and assembling precision of the support is analyzed and controlled, the unload forces of these 18 points are assigned. With this method, the surface error of the flat tested by Ritchey-Common arrangement is satisfactory for the alignment of SST of less than 1/50λ (RMS, λ=633nm).

Paper Details

Date Published: 30 May 2006
PDF: 6 pages
Proc. SPIE 6148, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 61480D (30 May 2006); doi: 10.1117/12.674053
Show Author Affiliations
Yongwei Guo, The National Astronomical Observatories (China)
Xuedong Gu, The National Astronomical Observatories (China)
Shimo Yang, The National Astronomical Observatories (China)


Published in SPIE Proceedings Vol. 6148:
2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
Yudong Zhang; Wenhan Jiang; Myung K. Cho, Editor(s)

© SPIE. Terms of Use
Back to Top