泊松亮斑演示实验的数值研究  

Simulated Study on Demonstration of Poisson Bright Spot

作　　者：张鑫[1] ZHANG Xin(School of Science,Tianjin University of Technology and Education,Tianjin 300222,China)

机构地区：[1]天津职业技术师范大学理学院,天津300222

出　　处：《大学物理实验》2023年第5期44-48,共5页Physical Experiment of College

摘　　要：泊松亮斑是由于光衍射而产生的经典光学现象,在“大学物理”课程中经常被用来说明光的波动性,并作为典型的演示实验在课堂中展现。对圆屏衍射图样进行了数值计算,系统分析了光源波长l、圆屏半径R、圆屏和接收屏间距z,以及圆屏粗糙度对泊松亮斑的影响。结果显示,圆屏对接收屏中心遮蔽的半波带数k是影响泊松亮斑的重要参数。在保证亮斑光强和对比度的前提下,k越小,越有利于演示。Poisson bright spot is a classic optical phenomenon caused by light diffraction,which is used as a typical demonstration experiment in the college physics for proving the wave character of light.The diffractions of circular screen are numerical calculated.And the influences of several parameters are systematically analyzed,including wavelength l,radius of circular screen R,distance between circular screen and receiving screen z,and roughness of the edge of circular screen.The results show that the number of Fresnel half-wave zones k is an important parameter.For the values of k that supporting high levels of Poisson bright spot intensity and contrast,the smaller k is supposed to benefit the demonstration.

关 键 词：泊松亮斑 菲涅耳-基尔霍夫衍射积分 菲涅耳半波带 演示实验 

分 类 号：O436.1[机械工程—光学工程]