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Proceedings Paper

Mirror seeing control of large infrared solar telescope
Author(s): Haiying Zhang; Xinnan Li; Xiaohui Meng; Houkun Ni
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Paper Abstract

To obtain high resolution infrared image, both low photon efficiency and long wavelength of infrared light requires enough large aperture telescope, but large aperture vacuum windows can hardly achieve high optical quality, so open structure becomes the only viable choice for large infrared solar telescope. In addition to the effects of atmospheric turbulence, open solar telescopes suffer from the heating of the optics by sunlight, especially primary mirror heating. These factors cause the image to shiver and become blurred, and increase infrared observing noise. Since blowing air across the front surface of the primary mirror doesn't have the necessary heat transfer coefficient to remove the absorbed heat load, it must be cooled down to maintained at a temperature between 0K and 2K below ambient air temperature to reduce the effects of turbulence. This paper will introduce some cooling methods and simulation results of primary mirror in large infrared solar telescope. On the other hand, mirror material with nice thermal conductivity can reduce the temperature difference between mirror surface and air, and mirror surface polishing at infrared wavelength can be comparatively easier than at visible wavelength, so it is possible to select low cost metal mirror as primary mirror of infrared solar telescope. To analyze the technical feasibility of metal mirror serving as primary mirror, this paper also give some polishing results of aluminum mirror with electroless nickel coating.

Paper Details

Date Published: 6 August 2010
PDF: 8 pages
Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 77332Y (6 August 2010); doi: 10.1117/12.856099
Show Author Affiliations
Haiying Zhang, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Xinnan Li, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Xiaohui Meng, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Graduate Univ. of Chinese Academy of Sciences (China)
Houkun Ni, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)


Published in SPIE Proceedings Vol. 7733:
Ground-based and Airborne Telescopes III
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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