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

机译：采用波前编码技术的同轴三镜Cassegrain系统的成像和图像恢复

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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. (C) 2015 Optical Society of America
机译：在空间光学系统中采用波前编码（WFC）技术来解决由温度差异或卫星运动的振动引起的散焦问题。根据WFC的理论，我们计算和优化了立方相位掩膜板的相位掩膜参数，该参数用于轴上三反射镜Cassegrain（TMC）望远镜系统。仿真分析和实验结果表明，散焦调制传递函数曲线和相应的模糊图像在原始TMC系统的聚焦深度（DOF）的10倍范围内具有完美的一致性。经过维纳滤波器的数字图像处理后，恢复图像的空间分辨率高达57.14线对/ mm。结果表明，TMC系统中的WFC技术在扩展自由度方面具有优越的性能，并且对散焦的敏感性较低，这对于解决空间光学系统中的散焦问题具有重要的价值。 （C）2015年美国眼镜学会

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