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对以球面波作为参考光记录数字全息图的采样和再现分离条件进行了详细的分析。推导出了同时满足采样和再现分离条件时 ,CCD及物体的横向尺寸、物体及参考光源至CCD的距离之间需要满足的关系式 ,证明了完全散射物体上复振幅在记录面上的叠加可以等效为一个点光源在记录面上产生的效果 ,进行了相应的实验研究。结果表明 :数字全息术中采用球面参考光波可以比采用平面参考光波更容易满足采样和分离条件 ,并可以记录到更多的物体信息 ;在物体至CCD的距离固定的情况下 ,无透镜傅里叶变换全息术是优化的记录光路结构 ;散射物体比衍射物体的数字全息图更容易满足采样和分离条件。
A detailed analysis of the sampling and reproduction separation conditions of a digital hologram recorded using a spherical wave as a reference light is carried out. The relationship between the horizontal size of the CCD and the object, the distance between the object and the reference light source and the distance from the CCD to the CCD is deduced when the separation and sampling conditions are both satisfied. It is proved that the superposition of the complex amplitude on the recording surface of a fully scattering object Equivalent to the effect of a point light source on the recording surface, the corresponding experimental study. The results show that the use of spherical reference light in digital holography can more easily satisfy the sampling and separation conditions than the use of plane reference light and can record more object information. In the case of a fixed distance from the object to the CCD, Leaf-transform holography is an optimized recording optical path structure; scattering objects can more easily satisfy the sampling and separation conditions than the digital holograms of diffractive objects.