摘要
把菲涅耳衍射积分化为含快速傅里叶变换的积分,对任意形状衍射屏的衍射进行模拟,其特点是直接用含快速傅里叶变换的积分求解出不同传播距离观察屏上的光场分布,得出菲涅耳衍射和夫琅禾费衍射的衍射花样.通过计算机对常见的缝孔的衍射的模拟,有助于理解衍射光在传播方向上近场衍射和远场衍射的不同和衍射花样的分布特征.
The Fresnel diffraction integral is carried out with numerical methods using fast Fourier transform （FFT）, and the diffraction of light wave by different screens are simulated. The light field distribution of Fraunhofer diffraction and Fresnei diffraction can be calculated directly when an observer plane is placed at different distances from the screen. Simulation of diffraction of common slit/ hole on computer is of advantage for us to understand the difference of diffraction in near and far fields and the pattern distribution.
出处
《物理实验》
2006年第10期14-17,共4页
Physics Experimentation
关键词
菲涅耳衍射
夫琅禾费衍射
快速傅里叶变换
Fresnel diffraction
Fraunhofer diffraction
fast Fourier transform
