提出了两种光瞳在光学扫描全息系统中实现边缘提取的方法,基于双光瞳外差检测来获取物体的全息信息。首先,采用LG光束-轴锥镜光瞳和小孔滤波器作为两个光瞳构建复合光场,并对物体进行扫描,提取边缘信息;其次,在小孔滤波器不变的情况下,采用幂函数分布的振幅型光瞳作为另一种光瞳,完成边缘信息的提取。计算机仿真实验结果表明,使用本文所述的两种光瞳相比使用环形光瞳时实现的边缘提取质量均有提升,且无须进行数字图像处理,简化了实验步骤。

Two methods for the edge extraction of optical pupils in optical scanning holographic systems were proposed, and the holographic information of objects was obtained based on double pupil heterodyne detection. First, LG beam-axis cone lens pupil and aperture filter were used as two pupils to form a composite light field, which was able to scan the object to extract edge information. Second, when the aperture filter was unchanged, the other pupil used a power amplitude-type pupil with function distribution and edge information extraction. Computer simulation experiments show that the edge extraction qualities of the two pupils described in this paper are improved in comparison with the use of a ring pupil, and digital image processing is not required, which simplifies the experimental steps.