大学物理 ›› 2009, Vol. 28 ›› Issue (8): 35-35.

• 著者文摘 • 上一篇    下一篇

随机分布的多圆孔的夫琅禾费衍射场分布研究

李多 柯晓露 景红梅 平澄 张萍 周静   

  1. 北京师范大学物理系,北京100875
  • 出版日期:2009-08-20 发布日期:2009-08-20

Analysis on the Fraunhofer diffraction of random distributed holes

  • Online:2009-08-20 Published:2009-08-20

摘要: 采用蒙特卡罗方法先对随机分布的多圆孔构成的衍射屏进行了分析计算,并与单个圆孔的衍射场进行了比较,结果表明,多圆孔的衍射场与单个小圆孔的衍射场有相同的条纹形状和条纹半径,但多圆孔衍射场的能量比单个圆孔的衍射场能量明显增加,同时场强变化不均匀,有叠加噪声的效果,在衍射艾里斑的中心处有一个强亮点.然后对大圆孔内随机分布着的小圆屏构成的衍射屏进行分析,得到了与多圆孔衍射类似的结论,这些结论与实验结果一致.

关键词: 圆孔衍射, 蒙特卡罗方法, 演示实验

Abstract: The Fraunhofer diffraction of random distributed circular holes is analyzed using the Monte-Carlo method and is compared with the diffraction distribution of a single circular hole. It is shown that the diffraction pattern of the random distributed circular holes has the same geometry characters as that of a single hole with the same radius. The former has a power stronger than the latter and has a very strong point in the center. Besides, the diffraction field of multi-holes has an unsmooth distribution which is similar to be added some noises. These conclusions are in agreement with the experimental results.

Key words: circular aperture diffraction, Monte-Carlo method, demonstrated experiment

中图分类号: 

  • O436.1