阿贝—波特实验的空间滤波方法和频谱综合的观点,现今公认为是现代信息光学技术的开端。本文对这些实验的原理作了严格的数学分析,定量地说明了所观察到的实验现象。照明网格的频谱将网格光场作出了数学表达式,进行傅里叶变换,得到频谱的数学表达式。从中得到三点结论:(一)衍射图样阵列的周期由网格的周期决定,两者成反比; The idea of ​​spatial filtering and spectrum synthesis of Abe-Porter experiments is nowadays recognized as the beginning of modern information optics. This paper makes rigorous mathematical analysis of the principle of these experiments, quantitatively illustrates the experimental phenomena observed. The spectrum of the lighting grid makes a mathematical expression of the grid light field and performs Fourier transform to obtain the mathematical expression of the spectrum. From which we can get three conclusions: (1) The period of the diffraction pattern array is determined by the period of the grid, and the two are inversely proportional;