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Proceedings Paper

Study on active support technology of ultra thin mirror with very large aperture
Author(s): Youjun Feng; Ruoxi Yang; Rongzhu Zhang
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Paper Abstract

Deformation of ultra thin mirror with very large aperture under external forces is analyzed. A thin plane bend equation ∇4w=q(r,θ)/D is employed to describe the deformation process caused by external forces, especially with small bending approximating. Under revolving symmetry condition, the radial coordinate r becomes the only variable of the bend equation. So it can be simplified as a one-dimension problem during calculation process. Finite element analysis (FEA) method is used to find the active support scheme. While the number and position of the external force points are given with suiTable displacement boundary constraint, the deformable curve corresponds to target curve. After optimizing operation the residual error is reasonable to suit optical demand. The result provides numerical basis for mirror deformable modification.

Paper Details

Date Published: 21 November 2007
PDF: 6 pages
Proc. SPIE 6721, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 67210J (21 November 2007); doi: 10.1117/12.782936
Show Author Affiliations
Youjun Feng, Sichuan Univ. (China)
Ruoxi Yang, Sichuan Univ. (China)
Rongzhu Zhang, Sichuan Univ. (China)


Published in SPIE Proceedings Vol. 6721:
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes

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