论微波单缝衍射实验中主极大的缺失

The Discussion of Absence of Main Diffraction Peak about the Experiment of Microwave Single-slot' Diffraction

针对微波单缝衍射实验中出现的主极大缺失的现象,从基尔霍夫标量式出发,假定电场在衍射屏上按高斯分布,在振幅、倾斜因子一级近似和相位二级修正近似下,用mathematica计算获得微波经不同宽度三缝的衍射分布,与微波光学实验仪上所得的实验结果较为一致.从而可以证实主极大的缺失主要是因为有部分微波从单缝板边缘绕射过来,三部分微波叠加的结果.

To the question of absence of main diffraction peak about the experiment of microwave single-slot＇ diffraction,based on Kirchhoff’s diffraction formula,under first order approximation of amplitude,second order approximation of phase and Gauss-distributing of electric field on the diffraction screen conditions,the diffraction patterns of various single-slot width are obtained in microwave band by mathematica.Meanwhile,the experimental results which are carried out on microwave spectrometer are in accord with that of calculation.Therefore,the main reason for the absence of main diffraction peak about the experiment of microwave single-slot＇ diffraction is that some microwave from the edge of the single-slot board acts on the microwave from the single-slot