 Sonoluminescence experiments
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Conundrum
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Sat Aug 11 2012, 08:17AM
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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
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Hi all.
Has anyone else had any luck building an SL cell?
It appears that I may be able to build one using 1.6 MHz fogger transducers.
The secret is to hand blow the glass bulb to exactly the right size, so that it resonates at
400 kHz (second fundamental)
Doing the calculations, this means that the required glass sphere would need to be
25khz*15 = 390 kHz
therefore 65mm / 15 =
4.3mm in diameter (!)
which is ridiculous.
this sounds plausible, however I am not sure about this.
Can anyone else suggest an alternative?
I did wonder about using two sheets of glass and epoxying the transducers to those, then using a
vernier adjustment to precisely set the gap.
A related experiment, instead of using a single spherical glass tube use a glass test tube with the transducers glued to that.
Then immerse this in a spherical flask filled with fluorinert or something non conductive and experiment with different solutions.
It has been reported that SL in sulphuric acid with dissolved argon can be 50* brighter than regular water SL.
I'd be interested to hear if anyone else has tried this approach, in addition to providing cooling for the transducers it should allow
much higher peak powers as the main limiting factor is complex I2R heating in the transducers either cracking the glass or depolarising the ceramic.
-A
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