I received this email from a fellow who reads the
discussion list archives and wanted to make some
useful comments, I think they are certainly worth
posting so here goes;
---------------------------
Date: Sun, 19 Mar 2000 23:06:46 -0700
From: Christopher Fitzgerald
To: jdecker@keelynet.com
Subject: Hi again.
Dear Jerry Decker,
You probably didn't expect to hear from me again;
however I assure you that it was inevitable. I keep
an active eye on the KeelyNet discussion list and web
site.
It is one of the most interesting and compelling
sources that I have found, and on a subject I would
love to see brought to the attention of the general
populous. Sadly enough, what I can do is small,
mostly because I'm only a post secondary student,
without a job, and having trouble attaining the $45ca.
for my monthly bus pass. But enough of my problem, let
me get down to the reason for this email.
Now I can guarantee that I am in now way experienced
in much (if not all) of the topics presented, and
although I am familiar in theory, I have no time, let
alone enough resources, to perform any experiments to
become experienced; so what I cite from is simply
speculation, imagination, and a collage of ideas that
have been attained over time from a plethora of
sources.
I recently read a message from the discussion list,
and I was reminded of a movie, and an experiment I had
heard of (probably from KeelyNet).
The movie was Chain Reaction (I believe you have an
article about it on the site somewhere too).
The experiment they were performing in attempt to
dissociate water into hydrogen and oxygen, was a form
of sonoluminescence. They had to overcome a problem
of the bubble being unstable, and collapsing, stopping
them from producing enough hydrogen to burn.
Ken Carrigan had brought up the point in his message
(1) that "The sound waves are what make the bubble
collase in the center.. thus resulting in constructive
inferference to the injected bubble shinking it and
making it collapse."
This is what queued my memory of the experiment. This
experiment pertained to ultrasonic weapons, or more so
the resonance of objects all around us.
It was proposed (and I believe proved) that when a
reference wave was aimed at an object, a reflecting
wave produced could be captured.
The reference wave could then be adjusted to tend
towards the reflecting wave, so as to reach the limit
of convergence and produce a resultant wave form that
would be the resonance frequency of the object.
Thus, after moments, the target object would basically
reach an oscillating resonance, and possibly explode.
Now, with this in mind, I will term this as
constructive feedback; using the feedback (reflecting
wave) to alter the reference wave each cycle, and thus
push the feedback a step closer to the resonance
frequency of the target object.
Below is an excerpt of the sonoluminescence process
that I obtained from a web site (2):
"Sonoluminescence is the conversion of sound into
light. Ultrasonic waves are aimed at an air bubble in
a small water cylinder. The sound waves cause the
bubble to oscillate furiously:
(a) the bubble starts out at a size around 5 microns
(millionths of a meter);
(b) then it expands to a maximum size (not to scale)
of about 50 microns.
At this large size there is a near-vacuum inside the
bubble because of the relatively few air molecules
present. This low-pressure near-vacuum region is
surrounded outside the bubble by a much
higher-pressure region, which causes
(c) a catastrophic collapse of the bubble to between
0.1 and 1 microns. During this compression phase a
flash of light (d) emerges from the bubble."
Now with this in mind, it's simply a task of aiming
ultrasonic sound waves at a bubble within a liquid
(presumably water; or a solution derived thereof).
Sound familiar? As Ken stated, the bubble collapsed
due to constructive interference. Now from wave
physics, I can infer that the interference is due to
the reference wave (in this case the ultrasonic
wave)which remains constant, thus not allowing itself
to tend towards the bubble's resonant wave; and so it
ultimately produces only interference which is the
cause of the bubble's destruction.
The question I propose, is if one were to use a
constructive feedback system to feed the bubble with
the appropriate ultrasonic wave, would it tend towards
the resonance, and reach an equilibrium that would
keep the bubble alive, or would it only further its
destruction?
There's no way to guarantee that my ideas are sound,
let alone adequate for any review; it's just that this
idea kind of struck me, and since there was no one
else I knew who would really be interested let alone
educated in such an area, I thought those with and for
KeelyNet may.
Thus if you actually believe this has some merit,
rather than just being the rambling mind of another
uneducated dreamer, you are free to post it in its
entirety, excluding only my email address, for reasons
of keeping this address free from probing site
scanners' spamming antics.
If anyone wishes to contact me, I can make a more
suitable email address known.
Bibliography of Sources
1 - Carrigan, Ken, (19 Mar 2000), "RE: SL Lasers",
Available at:
http://www.escribe.com/science/keelynet/m8164.html
[2000]
2 - Tarlton, Malcolm, - American Institute of
Physics, (2000),
"Physics News Graphics: The Sonoluminescence Process",
Available at:
http://www.aip.org/physnews/graphics/html/sono1.htm
[2000]
Regards,
- Christopher Fitzgerald
---------------------
I will add that Dan Davidsons Dr. X experiment uses
precisely that technique of monitoring the height of
the water column so that a standing wave can always be
maintained by monitoring the gradual dissipation of
the water.
The file is;
http://www.keelynet.com/energy/docx.htm
A Barium Titanate ultrasonic transducer was fixed to
the bottom of a quartz tube which was closed at the
bottom and open at the top.
Pure water was poured into the tube and the water
column was "tuned" so that a standing wave was
produced at 40,000 CPS (cycles per second).
The transducer was powered by a 700 Watt power
amplifier which was driven by an ultrasonic frequency
generator.
Because of the large amount of power put into the
column of water a certain amount of evaporation took
place at a constant rate when the transducer was
energized.
Therefore, to maintain a standing wave in the water
column a feedback device caused the frequency to be
raised as the water evaporated and the temperature
changed.
---------------------------
It would be a great experiment to try but, strike or
ignite a sonoluminscent bubble and see if a resonance
between the bubble size or the water would produce
useful phenomena.
I'd think simply creating a standing wave in the
container of water wouldn't make much difference, an
effect might appear if the bubble diameter was
resonated.
--- "Carrigan, Ken" <kcarrigan@anteon.com> wrote:
> I have tried and obtained results in
> sonoluminescence with a boiling flask, about 250ml.
> But 'exact' wavelengths of violet light (blue)
> is about 400 to 500nm (nano meter). This made no
> sense to me.. seeming that the flask diameter is
> around 76,000 um or 76,000,000 nm? It maybe a
> multiple but... The sound waves are what make the
> bubble collase in the center.. thus resulting in
> contructive inferference to the injected bubble
> shinking it and making it collapse.
> v/r Ken Carrigan
>
> -----Original Message-----
> From: Bill Perry
> To: keelynet
> Sent: 3/18/00 9:52 PM
> Subject: SL Lasers
>
> In regards to sonoluminescence, has anyone every yet
> tried making the flasks for the experiments to have
> a width of an exact multiple of the blue light from
> the bubble, and possibly, make the glass reflective,
> so the light would lase inside the flask, and
> possibly add energy to the bubble?
> BillP
=====
=================================
Please respond to jdecker@keelynet.com
as I am writing from my work email of
jwdatwork@yahoo.com.........thanks!
=================================
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