The Construction Of Optical Experiment Computer Simulation Platform

With the development of computer technology, computer-assisted instruction has stepped into the teaching of modern education system. MATLAB software has powerful image processing and numerical computing functions, the simulation of optical experiments, which involve practical difficulties, can be realized by modeling and programming. The simulation can enable students to preview experiment, understand experiment, complete experiment and review experiment much better.People do a lot of research on the optical experiment simulation system by using MATLAB. But there are still many defects, such as, there is no graphical user interface, the parameters can not be freely adjusted, lacking of the simulation of laser experiment, and it can not run without MATLAB background. In this paper we use MATLAB to develop a well extensible and portable optical experiment platform, which including the interference and diffraction of basic optics experiment, the optical image processing of information optics and laser experiment simulation. Details are as follows:(1) The simulation of based optical experiments. According to the basic theory of optical interference and experimental device, we set up a mathematical model of the interference experiment and give the process of algorithm, which can realize the simulation of the optical beats experiment, the interference experiment of spherical wave light source vertical and parallel to the observation screen, Young's double holes and double-slit interference experiment and equal inclination, equal thickness interference experiment. Further we discuss the simulation realization of polychromatic light as the light source. Based on the basic theory of the Fresnel and Fraunhofer diffraction, we establish the mathematical model of diffraction experiment simulation, analyze diffraction pattern with its intensity distribution of Fraunhofer diffraction and Fresnel diffraction under different apertures, and complete the simulation of grating diffraction successfully.(2) The simulation of information optics experiment. The 4f imaging system theory has been discussed in this paper, based on which we establish a spatial filtering simulation algorithm and achieve the low pass, high pass, band-pass filter simulation. Then we briefly analyse the basic methods of edge detection, feature extraction and image enhancement, and proceed the simulation at last.(3)The simulation of laser experiment. In the paper we analyse the principle and corresponding theoretical deducement of the Gaussian beam, self reproduce mode and laser mode-locking. So we can propose the basic ideas and the simulation algorithm by MATLAB that can achieve simulation. Finally the idea has been proved well by comparing a set of results, which attained by setting different parameters on the simulation, with the theoretical and practical record.(4) Construction of optical experiment platform. We discuss the reason of using MATLAB GUIDE as development environment, and analyse the principles and steps of designing the graphical user interface. On this basis, we make the simple, artistic interface and well scalable optical experiments simulation platform, which realize flexibility in setting the experimental parameters and include good human-computer interaction function, finally we make MCC compiled to generate the independent and executable files, which can run separately without MATLAB environment.