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Re: Cryogenics Bat

On Wed, 12 May 1999, brian whatcott wrote:

Fitting a miniature spark plug in a mouthpiece, and capturing the impulse
response
from a microphone capsule via an A/D sounds relatively easy to set up.
A kitchen piezo gas igniter could provide the spark. an ordinary plotter
shareware package offers FFT.... Now THERE's a science fair experiment!

...or for a quick check, clamp two similar bits of metal in small vises,
adjust them to give identical tones when plucked, then dip one in LN2.
When the sample has warmed up again, has the resonant frequency changed
as compared to the control?

Hey, I know! See if LN2-dipping can de-tune one of a pair of identical
tuning forks. If whacked simultanously, any changes to their beat-note
would be pretty obvious. If this demonstration gives large results, then
it might be interesting to see how low a temperature is required to achive
an easily-measured effect. What happens in a -30F freezer? Or in a
dry-ice/alcohol bath? Does temporarily *heating* the treated fork remove
the changes, or make them even larger?


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