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Author Topic: Lissajous' Figures  (Read 9831 times)
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Fu-Kwun Hwang
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on: June 13, 2010, 01:58:21 pm » posted from:Taipei,T\'ai-pei,Taiwan

Lissajous' Figures
When we superpose two simple harmonic movements with perpendicular directions, we obtain a planar movement that is described by the equations x = A1 * cos(w1*t) y = A2 * cos(w2*t + d)  where the A's denote the amplitudes of the respective movements (horizontal the first one, vertical the second), the w's denote the respective frequencies and d denotes the phase delay between both movements.
If we supply these two signals to the horizontal and vertical inputs of an oscilloscope, its beam will describe a movement that is the result of the superposition of both individual movements and that can adopt several nice figures, depending on the value of the ratio w1/w2 and on d.
These curves are called Lissajous' figures and are specially nice for certain values of the parameters.

Author : Francisco Esquembre 

 Date : February 2002

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Fu-Kwun Hwang
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Reply #1 on: June 13, 2010, 02:01:32 pm » posted from:Taipei,T\'ai-pei,Taiwan

Lissajous' Figures
When we superpose two simple harmonic movements with perpendicular directions, we obtain a planar movement that is described by the equations x = A1 * cos(w1*t) y = A2 * cos(w2*t + d) where the A's denote the amplitudes of the respective movements (horizontal the first one, vertical the second), the w's denote the respective frequencies and d denotes the phase delay between both movements.
If we supply these two signals to the horizontal and vertical inputs of an oscilloscope, its beam will describe a movement that is the result of the superposition of both individual movements and that can adopt several nice figures, depending on the value of the ratio w1/w2 and on d.
These curves are called Lissajous' figures and are specially nice for certain values of the parameters.

Author : Francisco Esquembre

 Date : February 2002

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  • Please feel free to post your ideas about how to use the simulation for better teaching and learning.
  • Post questions to be asked to help students to think, to explore.
  • Upload worksheets as attached files to share with more users.
Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!
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