Imaging and image restoration of an on-axis three-mirror Cassegrain system with wavefront coding technology

Xiaohu Guo; Liquan Dong; Yuejin Zhao; Wei Jia; Lingqin Kong; Yijian Wu; Bing Li

doi:10.1364/AO.54.002798

Imaging and image restoration of an on-axis three-mirror Cassegrain system with wavefront coding technology

Xiaohu Guo, Liquan Dong^*, Yuejin Zhao, Wei Jia, Lingqin Kong, Yijian Wu, Bing Li

^*Corresponding author for this work

School of Optics and Photonics

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

Wavefront coding (WFC) technology is adopted in the space optical system to resolve the problem of defocus caused by temperature difference or vibration of satellite motion. According to the theory of WFC, we calculate and optimize the phase mask parameter of the cubic phase mask plate, which is used in an on-axis three-mirror Cassegrain (TMC) telescope system. The simulation analysis and the experimental results indicate that the defocused modulation transfer function curves and the corresponding blurred images have a perfect consistency in the range of 10 times the depth of focus (DOF) of the original TMC system. After digital image processing by a Wiener filter, the spatial resolution of the restored images is up to 57.14 line pairs/mm. The results demonstrate that the WFC technology in the TMC system has superior performance in extending the DOF and less sensitivity to defocus, which has great value in resolving the problem of defocus in the space optical system.

Original language	English
Pages (from-to)	2798-2805
Number of pages	8
Journal	Applied Optics
Volume	54
Issue number	10
DOIs	https://doi.org/10.1364/AO.54.002798
Publication status	Published - 1 Apr 2015

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title = "Imaging and image restoration of an on-axis three-mirror Cassegrain system with wavefront coding technology",

abstract = "Wavefront coding (WFC) technology is adopted in the space optical system to resolve the problem of defocus caused by temperature difference or vibration of satellite motion. According to the theory of WFC, we calculate and optimize the phase mask parameter of the cubic phase mask plate, which is used in an on-axis three-mirror Cassegrain (TMC) telescope system. The simulation analysis and the experimental results indicate that the defocused modulation transfer function curves and the corresponding blurred images have a perfect consistency in the range of 10 times the depth of focus (DOF) of the original TMC system. After digital image processing by a Wiener filter, the spatial resolution of the restored images is up to 57.14 line pairs/mm. The results demonstrate that the WFC technology in the TMC system has superior performance in extending the DOF and less sensitivity to defocus, which has great value in resolving the problem of defocus in the space optical system.",

author = "Xiaohu Guo and Liquan Dong and Yuejin Zhao and Wei Jia and Lingqin Kong and Yijian Wu and Bing Li",

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T1 - Imaging and image restoration of an on-axis three-mirror Cassegrain system with wavefront coding technology

AU - Guo, Xiaohu

AU - Dong, Liquan

AU - Zhao, Yuejin

AU - Jia, Wei

AU - Kong, Lingqin

AU - Wu, Yijian

AU - Li, Bing

PY - 2015/4/1

Y1 - 2015/4/1

N2 - Wavefront coding (WFC) technology is adopted in the space optical system to resolve the problem of defocus caused by temperature difference or vibration of satellite motion. According to the theory of WFC, we calculate and optimize the phase mask parameter of the cubic phase mask plate, which is used in an on-axis three-mirror Cassegrain (TMC) telescope system. The simulation analysis and the experimental results indicate that the defocused modulation transfer function curves and the corresponding blurred images have a perfect consistency in the range of 10 times the depth of focus (DOF) of the original TMC system. After digital image processing by a Wiener filter, the spatial resolution of the restored images is up to 57.14 line pairs/mm. The results demonstrate that the WFC technology in the TMC system has superior performance in extending the DOF and less sensitivity to defocus, which has great value in resolving the problem of defocus in the space optical system.

AB - Wavefront coding (WFC) technology is adopted in the space optical system to resolve the problem of defocus caused by temperature difference or vibration of satellite motion. According to the theory of WFC, we calculate and optimize the phase mask parameter of the cubic phase mask plate, which is used in an on-axis three-mirror Cassegrain (TMC) telescope system. The simulation analysis and the experimental results indicate that the defocused modulation transfer function curves and the corresponding blurred images have a perfect consistency in the range of 10 times the depth of focus (DOF) of the original TMC system. After digital image processing by a Wiener filter, the spatial resolution of the restored images is up to 57.14 line pairs/mm. The results demonstrate that the WFC technology in the TMC system has superior performance in extending the DOF and less sensitivity to defocus, which has great value in resolving the problem of defocus in the space optical system.

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Imaging and image restoration of an on-axis three-mirror Cassegrain system with wavefront coding technology

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