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Proceedings Paper

Thermal analysis of a 4m honeycomb telescope primary mirror
Author(s): Jun Zhang; Hao Xian
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Paper Abstract

Thermal characteristics of a 4m class honeycomb telescope primary mirror are presented. A 3 dimensional finite elements model of the primary mirror with the varying ambient air temperature as the boundary conditions is used for the numerical simulations. Every night’s air temperature profile has been detected in 2009 in Gaomeigu observatory site. Four typical nights’ air temperature profiles in different seasons are chose as the boundary conditions in finite element simulation. Temperature difference between primary mirror’s optical surface and ambient air is studied, as well as the axial temperature difference inner the mirror blank and radial temperature difference on the optical surface. Primary mirror seeing phenomenon results from the temperature difference between primary mirror’s optical surface and the ambient air is discussed. Thermal deformations due to temperature gradient of the primary mirror are analyzed by the finite element model. Axial thermal deformations on the optical surface are discussed in detail. Thermal deformation would induce the optical surface of primary mirror to distort from the normal shape, and lead to large observation image quality degradation. Primary mirror seeing with the turbulence near the optical surface would introduce wavefront aberration and deteriorate the final observation image. In order to reduce mirror seeing and thermal deformation, it is necessary to design a thermal control system for primary mirror. The thermal and structural analysis result will be valuable in designing primary mirror’s thermal control system.

Paper Details

Date Published: 15 October 2012
PDF: 8 pages
Proc. SPIE 8415, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 84150L (15 October 2012); doi: 10.1117/12.970560
Show Author Affiliations
Jun Zhang, Institute of Optics and Electronics (China)
Key Lab. on Adaptive Optics (China)
Graduate School of the Chinese Academy of Sciences (China)
Hao Xian, Institute of Optics and Electronics (China)
Key Lab. on Adaptive Optics (China)


Published in SPIE Proceedings Vol. 8415:
6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
Wenhan Jiang; Myung K. Cho; Fan Wu, Editor(s)

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