菲涅耳直边衍射的边界波处理

The Boundary Wave Approach for Diffraction of Fresnel Straight-edge

要本文运用边界波理论对菲涅耳直边衍射问题进行了研究．分别对Ｅ偏振和Ｈ偏振情况下相应的场分布用边界波理论进行了理论分析和计算，并将它们与严格的电磁理论作了比较．结果表明，边界波处理方法中的基尔霍夫和瑞利-索末菲理论，分别与直边衍射的严格电磁理论解中的电场分布和磁场分布符合较好．前两者在远场时一致，而在近杨衍射存在差别．同时也表明，边界波处理方法具有物理图像清晰，计算简洁的特点．

The theoretical analysis of the diffraction of Fresnel straight--edge is presented in this paper by the boundary wave approach. The field distributions given by Kirchhoff theory and Rayleigh-Sommerfield theory are studied respectively, and further comparisons with the exact electromagnetic theory are also given. The results show that excellent agreements between them are achieved and the boundary wave approach has the characters of vividly physical view and directly calculation.