6 August 2010 An indoor three-mirror phasing experiment system based on a dispersed Hartmann type sensor
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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.
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Yong Zhang, Yong Zhang, Xiangqun Cui, Xiangqun Cui, Genrong Liu, Genrong Liu, Yuefei Wang, Yuefei Wang, Yeping Li, Yeping Li, Yajun Zhang, Yajun Zhang, Liang Zhang, Liang Zhang, Yizhong Zeng, Yizhong Zeng, } "An indoor three-mirror phasing experiment system based on a dispersed Hartmann type sensor", Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 773352 (6 August 2010); doi: 10.1117/12.856751; https://doi.org/10.1117/12.856751

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