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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 the imaging theory and point spread function of holographic system, the imaging resolution of digital holographic microscopy system is studied. The expression of imaging resolution without pre-amplification and pre-amplification is given. It is pointed out that only when the imaging resolution of CCD The imaging resolution of the pre-magnified digital holography system depends on the numerical aperture (NA) of the microscope objective when the imaging resolution is equal to or higher than that of the microscopic objective (MO). On the contrary, the imaging resolution of the system depends on the resolution of the CCD The numerical aperture. A lensless Fourier transform holographic recording optical path was used to study the Air Force resolution test plate. The results show that the resolution of the reconstructed image is 3.91μm and 4.38μm, respectively, in horizontal and vertical directions, which is consistent with the theoretical analysis. The streaks were recorded and reproduced holographically, and the results were consistent with the theoretical analysis.