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Proceedings Paper

New method for detecting the piston of segmented mirrors: a modification of the peak ratio technique
Author(s): Dan-dan Qu; Yue-jin Zhao; Li-quan Dong; Rongrong Chen
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Paper Abstract

Large segmented mirrors require efficient co-phasing techniques in order to avoid the image degradation due to segments misalignment. Detecting the piston error in high precision is critical to phasing the segmented mirrors. The energy ratio method, compared with the peak ratio technique, is presented in this paper to detect the piston. It focuses on a single quadrate intersegment subaperture which straddles two segments .This method provides a way to extracting some information on piston error. The details of the diffraction-interference pattern formed by the subaperture are sensitive to the piston when observed on the image plane. This method has several advantages compared with the peak ratio technique. The simulation results show that. the energy ratio method is good in detecting the piston error and is better than the peak ratio technique in robust and reliability.

Paper Details

Date Published: 12 March 2008
PDF: 9 pages
Proc. SPIE 6624, International Symposium on Photoelectronic Detection and Imaging 2007: Optoelectronic System Design, Manufacturing, and Testing, 66240N (12 March 2008); doi: 10.1117/12.791083
Show Author Affiliations
Dan-dan Qu, Beijing Institute of Technology (China)
Yue-jin Zhao, Beijing Institute of Technology (China)
Li-quan Dong, Beijing Institute of Technology (China)
Rongrong Chen, Beijing Institute of Technology (China)


Published in SPIE Proceedings Vol. 6624:
International Symposium on Photoelectronic Detection and Imaging 2007: Optoelectronic System Design, Manufacturing, and Testing

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