Thermoacoustic 'Laser' Demo
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Specifically, it's a Sondhauss tube.
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This is probably a Rijke tube -- a heat-powered sound generator. (Lord Rayleigh explained how it works.) The test tube acts as a quarter-wave resonator; hence it produces a tone of 500-600 Hz.
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Oh... and ALL branches of science and technology are rife with acronyms.... and worse still... backronyms..!
It's like a darned plague...!!! ;)
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I noticed that toward the end of the vid, the pitch did seem a little higher when the unit was fired up... But it might have been my imagination because my readings didn't register a pitch increase (unless I didn't quite get it at its high point).
I play didge and I often think of didge as an acoustic version of a laser. Your device is probably a closer fit to the analogy though.
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Thanks for that. As the temperature distribution changes, so does the acoustic impedance and therefore the operating frequency you hear.
Thermoacoustics is rife with acronyms! TADTAR, TASHE, TARGET, STAR, TAR, HDTAR, TAD-OPTR, etc. Feel free to add SATSAR to the list.
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Nice demo..
Just for your info... I made a number of frequency measurements from the video and my readings are about 550Hz on a digital scope.
(Accepting margin for error due to media quality, etc)
I guess it should really be called a SATSAR (Sound Amplification by Thermal Stimulation of Audio Resonance)... but it doesn't sound as cool, eh ???
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Can you produce ultasonic waves with that? if so, then I could see why you compare it to a laser.
richphuk 4 years ago
Apparently it's been termed a 'laser' because the tube is a cavity for which the sound is resonant, just like a laser contains a resonant optical cavity. As light rebounds and amplifies itself inside the cavity before discharge, the same thing sort of goes on here, except with sound.
lukez566 4 years ago
Thanks for the quick reply. Is it possible to produce powerful infrasonic waves with this? If I used a 20 meter 4" pvc pipe for example... Also how important is the shape and gemoetric proportions of the stack. I have seen it made from flat plates once, and I also saw it made of a reel of tape with round separators every few inches. How important is spacing and length... would it still work if the holes were round?
richphuk 4 years ago
I've replied via our thermoacoustics forum at the Adelaide University website.
lukez566 4 years ago