相干光成像系统传递函数的物理意义及实验证明  

Physical Significance and Experimental Proof of Transfer Function in Coherent Optical Imaging Systems

作　　者：李俊昌[1,2] 罗润秋 彭祖杰 宋庆和[1,2] 桂进斌[1] 夏海廷 Li Junchang;Luo Runqiu;Peng Zujie;Song Qinghe;Gui Jinbin;Xia Haiting(Department of Physics,Faculty of Science,Kunming University of Science and Technology,Kunming,Yunnan 650500,China;Yunnan Key Laboratory for Disaster Reduction in Civil Engineering,Kunming,Yunnan 650500,China)

机构地区：[1]昆明理工大学理学院物理系,云南昆明650500 [2]云南省土木工程防灾重点实验室,云南昆明650500

出　　处：《光学学报》2021年第12期74-79,共6页Acta Optica Sinica

基　　金：国家自然科学基金(11862008,61540075,61565011)。

摘　　要：根据相干光成像振幅分布的近似计算理论,成像系统是线性空间不变系统,出射光瞳表征的传递函数定义为几何光学像频谱的滤波器。基于能够准确计算像光场振幅及相位分布的理论,指出成像系统不是线性空间不变系统,从而将传递函数的物理意义定义为几何光学像经过特定距离进行菲涅耳衍射的空间滤波器。通过单透镜相干光成像和数字全息成像的模拟和光学实验,验证了传递函数新定义的正确性。According to the approximate calculation theory of the amplitude distribution of coherent optical imaging,the imaging system is a linear space invariant system,and the transfer function of the ocular circle is defined as the filter of the geometrical optical image spectrum.Using the theory for accurately calculating the amplitude and phase distributions of image optical field,we found that the imaging system was no longer a linear space invariant system and that the physical definition of the transfer function needed to be modified.Through simulation and optical experiments of single lens coherent optical imaging and digital holography imaging,we verified the new definition of the transfer function as a spatial filter for geometric optical images diffracted by Fresnel lenses at a specific distance.

关 键 词：信号处理 衍射计算 相干光成像 相干传递函数 

分 类 号：O438.2[机械工程—光学工程]