摘要
针对远距离数字离轴全息中的相位误差,实验研究了基于SPGD算法的多帧平均校正方法。建立了数字离轴全息实验装置,首先采用扫描法校正离焦相位误差,然后采用SPGD算法校正每帧的高阶相位误差;在此基础上,先采用目标图像相关法确定并粗校正帧与帧之间的倾斜相位误差,然后采用SPGD算法进一步校正帧间的倾斜和高阶相位误差。实验结果表明,本文提出的方法能够有效校正远距离数字离轴全息相位误差;与目前的校正方法相比,该方法校正速度更快、精度更高,更适合于对运动目标成像。
For phase error in long distance digital off-axis holography, a multi-frame averaging correction method based on SPGD algorithm is studied experimentally. A digital off-axis holography experimental device is set up. First, the scanning method is used to correct the defocus error. And then, the SPGD algorithm is used to correct the high or- der phase error of each frame. On these bases, the target image correlation method is used to determine and rough cor- rect the tip-tilt phase error among the frames. And then, the SPGD algorithm is used to further correct the tip-tilt and high orders phase error among the frames. The experimental results show that the method proposed in this paper can ef- fectively correct the phase error in digital off-axis holography and compared with the current methods, the proposed method is faster and more accurate and more suitable for the imaging of moving targets.
作者
杨旭
陈波
李小阳
孙天齐
YANG Xu CHEN Bo LI Xiao-yang SUN Tian-qi(School of Electrical Engineering, North China University of Science and Technology, Tangshan Hebei 063009, Chin)
出处
《激光杂志》
北大核心
2017年第4期96-100,共5页
Laser Journal
基金
河北省高等学校科学研究项目(QN2014042)
河北省自然科学基金(F2013209149)
关键词
全息
相位校正
SPGD算法
多帧平均
holography
phase correction
SPGD algorithm
multi-frame average
