说明：  模拟小孔衍射实验，可任意控制孔半径大小，得到小孔衍射模拟图像、光量等高线分布图、小孔衍射的3D模拟图
(Analog pinhole diffraction experiments, may optionally control the size of the pore radius obtained pinhole diffraction simulation image, the light amount and contour maps, pinhole diffraction 3D simulation of FIG.)