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Proceedings Paper

An indoor three-mirror phasing experiment system based on a dispersed Hartmann type sensor
Author(s): Yong Zhang; Xiangqun Cui; Genrong Liu; Yuefei Wang; Yeping Li; Yajun Zhang; Liang Zhang; Yizhong Zeng
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Paper Abstract

Telescope with much larger primary can collect much more light and it is always pursued by the astronomers. Instead of using a monolithic primary, more and more large telescopes, which are now planed or in construction, invariably adopted segmented primary mirror. Therefore, how to sense and phase the primary mirror is the key technology. Unlike edge sensors, which need careful calibrations, dispersed Hartmann sensor (DHS) is non-contact method using broadband point light sources, and it can estimate piston by the two-direction spectrum formed by the transmissive grating's dispersion and lenslet array. Thus it can realize the combination of co-focusing and co-phasing. In this paper, we introduce the design of our dispersed Hartmann sensor together with its principle. We also manufacture a DHS sensor and do real tests on our existing segmented mirror optics platform. Finally some conclusions are given based on the test results.

Paper Details

Date Published: 7 August 2010
PDF: 11 pages
Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 773352 (7 August 2010); doi: 10.1117/12.856751
Show Author Affiliations
Yong Zhang, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Xiangqun Cui, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Genrong Liu, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Yuefei Wang, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Yeping Li, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Yajun Zhang, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Liang Zhang, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Graduate Univ. of Chinese Academy of Sciences (China)
Yizhong Zeng, 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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