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Concepts*
Equipment *
Explanation
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Beats
- Visualization
Demonstration
created by: Dr. Scott Dwyer - 2002
Modified
8/13/03
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CONCEPTS: |
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| Beats |
Lissajous figures |
| Frequency |
Sound Waves |
| Fundamental Frequency |
Waves |
| Interference |
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EQUIPMENT: |
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EXPLANATION: |
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| As a last look at wave interference,
here is a device for making Lissajous figures. All
you do is take two speakers and link them to a mirror
at 90 degrees apart. That way, one speaker drives
the x-direction of the mirror, and the other drives
the y-direction. The motions combine in two dimensions.
Bounce a laser off the mirror and you can project
these cool images on the wall. They appear 3-dimentional
and rotate in space. They change shapes if the frequency
difference between the speakers changes. |
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If you get to a point where you can hear slow
beats, you will notice the shape pulsating with
the beat frequency. This is a cool way to actually
"see" something you hear.
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Left Mirror Only:
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Right Mirror Only:
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Various Other Frequencies:
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