Re: Sonoluminescence

Kenneth Carrigan ( (no email) )
Tue, 2 Feb 1999 11:13:55 -0500

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Well, obviously this must be a question for me <g> as I have done =
sonoluminescence
and seen it work. Only, this last time.. I blew up the transducers to =
see how much
power I could pump into the transducer at harmonics. Seems combining =
the 1st and
2nd harmonics together in phase increases the amount of glow by 300%! =20
Never tried pulse electric current though.. as the sound pressure wave =
is the key,
as the propagation time constant slows down the waves meeting at the =
middle
and creates a standing wave pattern. Any bubbles close to the center =
are assimilated
into a single bubble which shrinks in size to about 1/2 mm where it will =
start to glow
very dimly blue (uv) and the microphone will pick up some harmonic =
distortion in
the sinewave pattern .. probably showing the nonlinear junction of the =
plasma in the
bubble. I have not measured the pulsing of the plasma, but it is stated =
that the
pulse rate is about 12ps and super super stable.. maybe even better than =
atomic
clocks (what I read about it.. anyway). This effect is even greater =
with Helium and
diffenent types of inert gases. The glow is thought NOT to be due to =
oxygen or Nitrogen
but possibly argon in the air..which is inert. Hummm Testing of this =
has been done
with only oxygen, hydrogen and nitrogen but no luminescence. Also the =
type of fluid
play an important part.. as not all fluids produce bubble luminescene. =
hummm

So I would predict electric current.. would not work as the effect of =
sono... requires
sound pressure levels. By the way.. it is some 20,000 times efficient =
(plasma temp)
from energy of sound input.. just no one can tap the plasma and "sucl it =
off" <g>
Solve that.. and we'll have something!

v/r Ken Carrigan
With respect to Sonoluminescence, does the size of the bubble have =
any direct correlation to the wave length of the sound wave used? and =
could one use a pulsing electric current instead of sound to create the =
standing waves?
BillP

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Well, obviously this must be a question for =me=20<g> as I have done sonoluminescence
and seen it work.  Only, this =last time.. I=20blew up the transducers to see how much
power I could pump into the transducer at harmonics.  Seems =combining=20the 1st and
2nd harmonics together in phase increases the amount of glow by =300%! =20
Never tried pulse electric current though.. as the sound pressure =wave is=20the key,
as the propagation time constant slows down the waves meeting at =the=20middle
and creates a standing wave pattern.  Any bubbles close to the =center=20are assimilated
into a single bubble which shrinks in size to about 1/2 mm where it =will=20start to glow
very dimly blue (uv) and the microphone will pick up some harmonic=20distortion in
the sinewave pattern .. probably showing the nonlinear junction of =the=20plasma in the
bubble.  I have not measured the pulsing of the plasma, but it =is=20stated that the
pulse rate is about 12ps and super super stable.. maybe even better =than=20atomic
clocks (what I read about it.. anyway).   This effect is =even=20greater with Helium and
diffenent types of inert gases. The glow is thought NOT to be due =to oxygen=20or Nitrogen
but possibly argon in the air..which is inert.  Hummm  =Testing of=20this has been done
with only oxygen, hydrogen and nitrogen but no luminescence. Also =the type=20of fluid
play an important part.. as not all fluids produce bubble=20luminescene.  hummm
 
So I would predict electric current.. would not work as the effect =of=20sono... requires
sound pressure levels.  By the way.. it is some 20,000 times =efficient=20(plasma temp)
from energy of sound input.. just no one can tap the plasma and ="sucl=20it off" <g>
Solve that.. and we'll have something!
 
v/r Ken Carrigan
With respect to Sonoluminescence, does the size of the =bubble=20 have any direct correlation to the wave length of the sound wave =used? and=20 could one use a pulsing electric current instead of sound to create =the=20 standing waves?
BillP
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