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Shive Wave Machine - Fabrey-Perot Interferometer
Purpose
To demonstrate the mechanical analog of the optical Fabrey-Perot interferometer.
Equipment
Shive Wave Machine, 4 crossarm weights, wave generator, dashpot, ruler.
Suggestions
This effect is subtle, in that it is not readily observable, so it must be actually measured to be convincing.
Images
Description
Pairs of small weights are connected to two arms six inches apart in the center of the machine. The dashpot is attached to the end of the machine opposite the wave generator to prevent reflections (It must be adjusted.). Measure the difference in amplitude of the transmitted wave by measuring the amplitude of the oscillation of the dashpot, and compare that with the amplitude of the incoming wave as measured by the amplitude of the generator. The maximum transmitted wave occurs when the reflected wave is minimized, that is, when the two arms with the weights are one-quarter wavelength apart.
References
John N. Shive, Similarities In Wave Behavior, Bell Laboraties, (1961).
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See pagesg1. simple harmonic motion
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See pagesg2. resonance & coupled oscillations
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See pagesg3. mechanical waves one dimensional
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See pagesg4. mechanical waves two dimensional
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See pagesg1. simple harmonic motion
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See pagesg2. resonance & coupled oscillations
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See pagesg3. mechanical waves one dimensional
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See pagesg4. mechanical waves two dimensional