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Proceedings Paper

Analysis of piston error of an optical sparse-aperture imaging system
Author(s): Juan Zhao; Dayong Wang; Zhiwei Zhou; Yuhong Wan; Zhuqing Jiang; Shiquan Tao
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Paper Abstract

With the development of Earth and Space missions, the quest for higher spatial resolution for telescopes will turn into urgent need. Optical sparse-aperture system can be designed to obtain high resolution in astronomical object imaging with several independent small-aperture telescopes. However, the images from separated telescopes are not only overlapped but also have same phase. The analysis and discussion on system error which would affect the co-phasing is presented. The piston error, namely the relative longitudinal phase shift across the sub-aperture is an important error to affect the performance of the imaging system. In this paper, we demonstrate the effects of the piston error on the point spread function of the system. Then the simulation has been fulfilled with the specific system parameters. The direct imaging results are obtained. Due to the image restoration techniques, we can also produce higher resolution and better imaging quality result after the restoration. By using the correlation coefficient as the evaluation criterion of imaging, the results show that image quality is reducing with the increase of the piston error periodicity.

Paper Details

Date Published: 6 May 2009
PDF: 5 pages
Proc. SPIE 7281, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 72810H (6 May 2009); doi: 10.1117/12.831441
Show Author Affiliations
Juan Zhao, Beijing Univ. of Technology (China)
Dayong Wang, Beijing Univ. of Technology (China)
Zhiwei Zhou, Beijing Univ. of Technology (China)
Yuhong Wan, Beijing Univ. of Technology (China)
Zhuqing Jiang, Beijing Univ. of Technology (China)
Shiquan Tao, Beijing Univ. 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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