New method for detecting the piston of segmented mirrors: a modification of the peak ratio technique

Dan-dan Qu; Yue-jin Zhao; Li-quan Dong; Rongrong Chen

doi:10.1117/12.791083

12 March 2008 New method for detecting the piston of segmented mirrors: a modification of the peak ratio technique

Dan-dan Qu, Yue-jin Zhao, Li-quan Dong, Rongrong Chen

Proceedings Volume 6624, International Symposium on Photoelectronic Detection and Imaging 2007: Optoelectronic System Design, Manufacturing, and Testing; 66240N (2008) https://doi.org/10.1117/12.791083
Event: International Symposium on Photoelectronic Detection and Imaging: Technology and Applications 2007, 2007, Beijing, China

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.

Citation Download Citation

Dan-dan Qu, Yue-jin Zhao, Li-quan Dong, and Rongrong Chen "New method for detecting the piston of segmented mirrors: a modification of the peak ratio technique", Proc. SPIE 6624, International Symposium on Photoelectronic Detection and Imaging 2007: Optoelectronic System Design, Manufacturing, and Testing, 66240N (12 March 2008); https://doi.org/10.1117/12.791083

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