Assembly of an acoustic laser
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I'm not trying to denigrate your work. This is clearly a wonderful experiment. However, what makes you call it a laser? If it were the acoustic equivalent of a laser wouldn't most of the sound be traveling in one direction. I would expect to hear only a hint of sound if this were a saser(?) .
salaciousBastard 11 months ago
The tube can also be heated externally (by an alcohol lamp or a blow torch) and a piece of steel wool can replace the porous plug.
KevinByrne2 1 year ago
The device is a thermoacoustic "engine". Specifically, it's a Sondhauss tube -- a quarter-wavelength acoustic resonator. The closed end of the tube is heated by a filament. Hot air then oscillates through the porous plug (the white object inserted into the tube), transferring heat from the hot, closed end towards the cool, open end of the tube. The air's motion reinforces sound waves in the tube, generating the sound heard.
KevinByrne2 1 year ago
so what's happening?
happyking9 1 year ago
tis sound is so crazy
johny166 2 years ago
Nah, just a Rijke tube. But... isn't the asymmetrical hot section behaving as a sound amplifier? If you piped some noise through the tube, then turned the heater on and off, would the sound intensity get higher and lower? Could an audio amp be built from a large flat array of these devices? Just play a musical instrument on one side of the panel!
wbeaty 4 years ago