基于光传播的角谱理论和抽样定理，讨论了给定抽样频率下同轴数字全息图的记录条件以及所适合的物体尺寸。CCD面阵尺寸、像素单元尺寸和间距限制了物体尺寸和全息图的记录距离。只有在满足抽样条件下所记录到的数字全息图才可能包含物体的三维信息。导出了用已知参数的CCD记录数字全息图时的适用范围。

Base on the angular spectrum theory and sampling theorem, recording condition and the size of suitable object are discussed during an in-line hologram recorded in given sampling frequency. The total size of CCD, detecting unit size and pitch limit the size of object and recording distance. Under the condition that sampling condition is satisfied, recorded hologram could contain three-dimensional information about object. Starting with this principle, application range is presented when a CCD with given parameters is used to record a hologram.