光学技术, 2015, 41 (3): 204, 网络出版: 2015-05-20  

基于遗传算法的稀疏孔径两次离焦相位差法

Sparse aperture two defocus phase method based on genetic algorithm
作者单位
1 苏州大学 物理与光电·能源学部, 江苏 苏州 215006
2 苏州科技学院 数理学院, 江苏 苏州 215009
摘要
稀疏孔径望远镜的子镜装调误差是影响光学系统成像质量的主要因素之一。研究了基于遗传算法的两次离焦相位差法, 即在稀疏孔径望远镜系统的两个不同的离焦面上获得两幅图像数据, 采用遗传算法, 通过最大似然估计目标函数最优化的方法, 恢复目标图像并计算出稀疏孔径光学系统的活塞误差和倾斜误差, 分析了复原图像的信噪比和方差。结果表明: 遗传算法与两次离焦相位差法的结合不但可以精确求得子镜的装调误差, 而且能够算出两次离焦的距离。与传统相位差法相比, 计算时间相当, 实验难度降低。
Abstract
Sparse aperture sub-mirror telescope alignment error is one of the main factors affecting the image quality of optical systems. The two defocus phase method is researched based on genetic algorithm. It is that the two defocus images are achieved on two different defocus planes of the sparse aperture telescope. Target image is restored and the piston error and the tilt error are calculated by the maximum likelihood estimation based on genetic algorithm. The ratio of signal and noise is analyzed, and the variance is also calculated. The results show that the combination of genetic algorithm and two defocus phase method can recover the phase alignment errors of the sub-mirror, and the focal distance is calculated. Times of calculating and recovering of two methods are almost same, and the difficulty of the experimental operation is easier than that of traditional phase method.

陈宝华, 胡孟孟, 姜慧, 李勋武, 吴泉英. 基于遗传算法的稀疏孔径两次离焦相位差法[J]. 光学技术, 2015, 41(3): 204. CHEN Baohua, HU Mengmeng, JIANG Hui, LI Xunwu, WU Quanying. Sparse aperture two defocus phase method based on genetic algorithm[J]. Optical Technique, 2015, 41(3): 204.

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