作　　者： ; ; ; ; ;

机构地区： 天津大学精密仪器与光电子工程学院

出　　处： 《中国激光》 2004年第5期570-574,共5页

摘　　要： 用菲涅耳衍射和振幅全息的理论 ,分析了数字全息的物像关系和再现像的分辨率 ,并进行相应的数值模拟和实验研究。研究结果表明 :数字全息的物像关系与传统振幅全息的物像关系是等同的 ,当用相同波长的准直光记录和再现数字全息图时 ,可以得到与原物完全相同的再现像 ,且再现光入射方向的变化仅使再现像位置发生平移 ,对其大小没有影响。数字全息的横向分辨率与传统成像光学仪器的分辨本领具有相同的物理意义 ,其大小主要取决于再现像位置处以CCD尺寸为窗口的衍射极限。模拟计算和实验测量的结果是完全吻合的 ,但在实际物体的记录中 ,由于噪声、照明光场的不均匀性、物光衍射光场的调制和CCD动态范围的影响 ,后者的误差比前者大。 By use of Fresnel diffraction and traditional holographic theory, this paper gives some quantitative analysis of the object image relation and the resolution of digital holography by computer simulation and corresponding experiment. The results shows: the object image relation of digital holography is the same as that of traditional holography, and if the collimating waves with the same wavelength are used in recording and reconstructing digital hologram, the size and shape of the reconstructed image are the same as that of the recorded object, and the incidence angle variation of reconstructing wave only make the position of the reconstructed image parallel shift and doesn′t influence the size of reconstructed image The physical meaning of the lateral resolution of digital holography is identical with that of the resolving power of optical image instrument, and the size of the lateral resolution of digital holography is determined by the diffracting limit using CCD′s size as windows at the position of reconstructed image. The results of simulation is almost the same as that of experiment.

关 键 词： 信息处理技术 数字全息 菲涅耳衍射 傅里叶变换 分辨率

领　　域： [一般工业技术]