激光与光电子学进展, 2020, 57 (12): 121103, 网络出版: 2020-06-03
基于二次图像补偿的相位差波前传感器 下载: 966次
Phase Diversity Wavefront Sensor Based on Secondary Image Compensation
相位差波前传感器 像差 信噪比 曝光时间 动态范围 phase diversity wavefront sensor aberration signal-to-noise ratio exposure time dynamic range
摘要
电荷耦合器件(CCD)的测量精度是影响波前复原精度的主要因素。受相机制造工艺的限制以及环境的影响,不可避免地会采集到噪声数据,从而影响低信噪比、高空间频率图像信息的采集。为了降低噪声对波前复原的影响,提出了一种基于图像补偿的改进相位差波前传感器。先在CCD相机的正常曝光时间和饱和曝光时间下分别采集两幅图像;然后融合成一幅包含准确高空间频率和低空间频率光强信息的图像。在相同信噪比下,对改进的相位差波前传感器和传统的相位差波前传感器进行了仿真。结果表明,改进的相位差波前传感器的波前反演精度有显著提高。最后通过实验进一步验证了该方法的有效性。
Abstract
The measurement precision of charge coupled device (CCD) is the main factor affecting the accuracy of wavefront reconstruction. Due to the limitations of camera manufacturing technology and environmental impact, it is inevitable that noise data will be collected, which will affect the image information collection with low signal-to-noise-ratio and high spatial frequency. An improved phase diversity wavefront sensor based on image compensation is proposed to reduce the influence of noise on wavefront reconstruction. First, two images are collected under the normal exposure time and saturated exposure time of CCD respectively. And then they are sewed into an image containing accurate high spatial frequency and low spatial frequency light intensity information. At the same signal-to-noise ratio, the improved phase diversity wavefront sensor and the traditional phase diversity wavefront sensor are simulated. The results show that the wavefront inversion accuracy of the improved phase difference wavefront sensor is significantly improved. Finally, the effectiveness of the method is further verified through experiments.
孔庆峰, 王帅, 杨平, 林海奇, 刘永, 许冰. 基于二次图像补偿的相位差波前传感器[J]. 激光与光电子学进展, 2020, 57(12): 121103. Qingfeng Kong, Shuai Wang, Ping Yang, Haiqi Lin, Yong Liu, Bing Xu. Phase Diversity Wavefront Sensor Based on Secondary Image Compensation[J]. Laser & Optoelectronics Progress, 2020, 57(12): 121103.