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Journal of Guangdong Polytechnic Normal University

The Computer Simulation of Intensity Distribution in Young's Double-slit Interference

Guo Lin

Published Jan 1, 2015• 0 citations
OpenAlex

Abstract

Considering double-slit interference as an optical wave passing a through double-slit hard aperture, the intensity expression of Young's double-slit interference is derived based on Collins diffraction integral. The intensity distribution of Young's double-slit interference is graphically demonstrated. The interference fringes will be changes by adjusting the parameter of slit width, double-slit separation, incident wavelength, etc. Meanwhile, the causes for the different brightness at bright fringe center in Young's double-slit interference are discussed. Additionally, the interference fringe width is calculated. The result agrees well with optical interference theory. As an expanding teach method, it will be helpful to understand the double-slit interference characteristics.

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Considering double-slit interference as an optical wave passing a through double-slit hard aperture, the intensity expression of Young's double-slit interference is derived based on Collins diffraction integral. The intensity distribution of Young's double-slit interference is graphically demonstrated. The interference fringes will be changes by adjusting the parameter of slit width, double-slit separation, incident wavelength, etc. Meanwhile, the causes for the different brightness at bright fringe center in Young's double-slit interference are discussed. Additionally, the interference fringe width is calculated. The result agrees well with optical interference theory. As an expanding teach method, it will be helpful to understand the double-slit interference characteristics.
Employing with MatLab, the relative light density distribution of Thomas Young dual-slit interference experiment is presented. This paper analyzes the light density distribution of Thomas Young dual-slit interference under different wavelengths and slit widths, and explains the causes for the different light density distribution in Thomas Young dual-slit interference. It reaches that slit widths are the factors for the uneven intensity distribution of Thomas Young dual-slit interference experiment, and the fringe width is inversely proportional to slit widths. Various parameters impacting on the interference is visually analyzed by means of computer simulation. It has an important guiding role on the optical theoretical study and experimental teaching.
T.Young's double slit interference experi m ent had played an important role in the foundation and development of wave optic s.The paper proposes a new methodthe spectrum method which calculates the distribution of intensity of light in the double slit experiment.Because the calculative program of the method is standard,the spectrum method which cardina l instrument in math is Fourier transform can be used,in principle,to tackle wit h the optical program of both interference and diffraction in general.