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Theoretical and experimental research of Lissajous figures of square wave

WANG Jian-bo,HUANG Shi-hua,ZHENG Jian-long,LI Wei(Department of Physics,Zhejiang Normal University,Jinhua 321004,China)  
Lissajous figures produced by taking two square waves and taking a sine wave and a square wave are investigated respectively.Using Fourier series theory,the square wave is expanded by sine and cosine Fourier series,and the Lissajous figures are produced by taking a square wave and a sine wave,and two square waves using Matlab.The differences between the theoretical simulations and the experimental results are analyzed,and a simple explanation is also given.
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