圆孔衍射中心显现亮暗斑的实验设计与实施

Experimental design and implementation of bright and dark spots in the center of circular hole diffraction

根据半波带法的理论推导,发现了在圆孔衍射实验中难以观察到衍射图样中心为暗斑的原因,并利用几何画板软件进行了模拟实验,快速找出了合理的实验参量.根据这些参量,采用简单的实验器材在课堂上为学生演示出了丰富的衍射现象.

In the circular hole diffraction experiment,it is difficult to observe the experimental phenomenon if a dark spot is in the center of the diffraction pattern,and the reason could be found by the theoretical derivation of the half-wave strip method.By using the Geometer Sketchpad software to carry out a simulation experiment,the reasonable experimental parameters were quickly found.Based on these parameters and using some simple experimental equipment,a wealth of diffraction phenomena could be demonstrated in the classroom.