非相干同轴数字全息望远系统的研究  

Incoherent On-Axis Digital Holographic Telescope System

作　　者：杨旭锋 张文斌[1] 谢一琳 张敏敏 涂标 杨学凯 马凤英[1] 弓巧侠[1] 杜艳丽[1] 

机构地区：[1]郑州大学物理工程学院,河南郑州450001

出　　处：《激光与光电子学进展》2017年第12期136-141,共6页Laser & Optoelectronics Progress

基　　金：河南省高等学校重点科研项目(15A140038)

摘　　要：基于菲涅耳非相干相关全息光路的望远系统,可以在较远距离下,得到目标物体的数字全息图。基于菲涅耳衍射理论,计算了成像过程的点扩展函数(PSF),理论上分析了菲涅耳非相干数字全息望远系统的成像原理、系统的横向放大率以及再现过程中的重建距离;搭建了基于菲涅耳非相干相关同轴光路的数字全息望远系统,在白光照明的条件下,利用探测器(CCD)记录物体的全息图,使用相移法消除了同轴光路下的零级像和共轭像,通过角谱算法得到清晰的重建像。孔径光阑的引入,解决了照明不均匀的问题,提高了成像质量。从实验上验证了系统的分辨率、景深以及三维成像特性。结果表明,当望远系统角放大率为2.0倍、望远距离为900mm时,分辨率可达到16.00lp/mm。The telescope system based on Fresnel incoherent correlation optical path can obtain the digital hologram of the object at a long distance. Based on Fresnel diffraction theory, the imaging process of the point spread function （PSF） is calculated. The imaging principle, the lateral magnification and the reconstruction distance of the system are deduced. A digital holographic telescope system based on the Fresnel incoherent correlation on-axis light path is constructed, and the CCD is used to receive the holograms under the white light. The conjugate image and the zeroorder image are eliminated by phase-shifting, and then the clear reconstruction image is obtained by the angular spectrum reconstruction algorithm. By introducing aperture diaphragm, we solve the problem, and improve the imaging quality. The resolution, depth of field and three-dimensional （3D） imaging characteristics of the system are verified experimentally. The experiment shows that the resolution is 16.00 lp/mm when the angle magnification is 2.0 and the distance is 900 mm.

关 键 词：全息 非相干同轴数字全息 望远系统 菲涅耳非相干相关全息 

分 类 号：O438.1[机械工程—光学工程]