Analysis of piston error of an optical sparse-aperture imaging system

Juan Zhao; Dayong Wang; Zhiwei Zhou; Yuhong Wan; Zhuqing Jiang; Shiquan Tao

doi:10.1117/12.831441

5 May 2009 Analysis of piston error of an optical sparse-aperture imaging system

Juan Zhao, Dayong Wang, Zhiwei Zhou, Yuhong Wan, Zhuqing Jiang, Shiquan Tao

Proceedings Volume 7281, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 72810H (2009) https://doi.org/10.1117/12.831441
Event: AOMATT 2008 - 4th International Symposium on Advanced Optical Manufacturing, 2008, Chengdu, Chengdu, China

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.

Citation Download Citation

Juan Zhao, Dayong Wang, Zhiwei Zhou, Yuhong Wan, Zhuqing Jiang, and Shiquan Tao "Analysis of piston error of an optical sparse-aperture imaging system", Proc. SPIE 7281, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 72810H (5 May 2009); https://doi.org/10.1117/12.831441

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KEYWORDS

Imaging systems

Point spread functions

Error analysis

Space telescopes

Telescopes

Modulation transfer functions

Image quality

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