数字全息显微系统的成像分辨率分析  

Imaging Resolution Analysis of Digital Holographic Microscopy

作　　者：王华英[1] 王广俊[1] 赵洁[1] 谢建军[1] 王大勇[1] 

机构地区：[1]北京工业大学应用数理学院

出　　处：《中国激光》2007年第12期1670-1675,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(60577029);北京市属市管高等学校人才强教计划资助项目

摘　　要：根据成像理论和全息系统的点扩散函数,研究了数字全息显微系统的成像分辨率,给出了无预放大和有预放大情况下成像分辨率的表达式,指出了只有当CCD的成像分辨率等于或高于显微物镜(MO)的成像分辨率时,预放大数字全息系统的成像分辨率才取决于显微物镜的数值孔径(NA);反之,系统的成像分辨率则取决于CCD的数值孔径。采用无透镜傅里叶变换全息记录光路,对美国空军分辨率测试板进行了实验研究,结果表明再现像在水平和垂直方向的极限分辨率分别为3.91μm和4.38μm,与理论分析相吻合。对条纹物体进行了全息图的模拟记录和再现,结果与理论分析相一致。According to optical imaging theory and the point spread function of digital holographic system, the imaging resolution of the digital holographic microscopy was investigated. The imaging resolution expressions of the digital holographic systems with and without pre-magnification were presented in details. With those formulas, it is clearly shown that only when the imaging resolution of CCD is not below the resolution of the microscope objective （MO）, the imaging resolution of the whole system is dependent on the numerical aperture （NA） of MO. Otherwise, it is dependent on the numerical aperture of the CCD. Experimental imaging of US air force-resolution test target is performed using the lensless Fourier transform configuration. The experimental results that ultimate resolution of reconstructed image in horizontal direction and vertical direction is 3.91 μm and 4.38 μm respectively. Finally, recording and reconstructing of holograms for stripe object are stimulated , and results are corresponding with theoretical analysis.

关 键 词：全息 预放大 显微 分辨率 无透镜傅里叶变换仝息 

分 类 号：TB877[一般工业技术—摄影技术]