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Proceedings Paper

Novel method of phasing segmented mirrors
Author(s): Qiudong Zhu; Shanshan Wang; Genrui Cao
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Paper Abstract

A novel approach of co-phasing segmented mirrors using a Dispersed Rayleigh Interferometer (DRI) which is used for measuring the optical path difference between two parallel beams is proposed. Basic principle of DRI is introduced and configuration of co-phasing segmented primary mirrors for a Cassegrain telescope is presented. A fringe processing method called Two-Dimension Fringe Analyzing (TDFA) is proposed to analyze Dispersed Rayleigh Interference Pattern (DRIP) automatically. A bread board including a co-phasing error generator and a DRI is established to demonstration the approach proposed. Preliminary results using the DRI established show that, measurement range reaches 200 μm, repeatability is better than 2nm in whole range under condition of S/N=20 and can be accepted when S/N>8, and measurement error standard deviation in 1 μm range is 5.8nm (S/N=20). All of the data imply that DRI is a wide-range and high-accuracy method for co-phasing of segmented mirror, and can be used in the orbit for its compact configuration and no movement element.

Paper Details

Date Published: 6 May 2009
PDF: 6 pages
Proc. SPIE 7281, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 728105 (6 May 2009); doi: 10.1117/12.831427
Show Author Affiliations
Qiudong Zhu, Beijing Institute of Technology (China)
Shanshan Wang, Beijing Institute of Technology (China)
Genrui Cao, Beijing Institute of Technology (China)


Published in SPIE Proceedings Vol. 7281:
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
Wenhan Jiang; Roland Geyl; Myung K. Cho; Fan Wu, Editor(s)

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