数字化演示实验助力光学慕课西行——以圆孔衍射实验为例

Application of digital demonstration experiment in optics MOOC Going West——Taking circular aperture diffraction as example

为了提升光学慕课西行线上同步课堂的教学效果,中山大学光学教学团队运用数字化技术手段,在课堂上通过多镜头线上实时呈现光学演示实验结果,实现了理论与实验相结合,为专业课教学提供数字化教学以及定量分析的功能.以圆孔衍射演示实验为例,从标量衍射理论出发推导圆孔夫琅禾费衍射以及菲涅耳衍射公式,同时测量圆孔衍射的光斑图样随衍射距离的变化.通过对比理论分析与实验结果,将专业课理论数字化呈现,并通过云端实现同步效果,有助于学生理解相关知识点,提升课程的教学效果.

The online synchronous classroom of optics in the“MOOC course Going West”at Sun Yat-sen University utilized digital technology to enhance teaching effectiveness.The classroom employed multiple cameraed to present optical demonstration experiments in real time,realizing the combination between theory and practical experiments,thus providing digital teaching and quantitative analysis capabilitied for professional course instruction.The demonstration experiment on circular aperture diffraction served as a typical case in the optics course.Starting from scalar diffraction theory,the Fraunhofer diffraction and Fresnel diffraction formulaed for circular apertures were derived.Simultaneously,the variation of the spot pattern of circular aperture diffraction was measured with diffraction distance.By comparing theoretical analysis with experimental results,the course effectively presented the digitalized representation of theoretical concepts,effectively contributing to students’comprehension of relevant knowledge points and enhancing the teaching effectiveness of the course.This case could provide the beneficial reference for the counterparts to develop the exporation on the the synchronized digital classroom.