Science > Physics > What can I use to induce RESONANCE in certain materials
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Science > Physics |
| User: |
"ABF" |
| Date: |
20 Jul 2005 10:43:41 AM |
| Object: |
What can I use to induce RESONANCE in certain materials |
Resonance can be induced to materials and system via waves or vibrations. I
would like to use sound-waves or radio-frequencies to induce resonance in
certain material, like liqueds and solids. What equipment can I use to
achieve this? (Some sort of wave/sound/frequency generator)
Sorry for the stupid question, but I am not an engineer.
Thanks
Anton
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| User: "CWatters" |
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| Title: Re: What can I use to induce RESONANCE in certain materials |
20 Jul 2005 02:05:31 PM |
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"ABF" <anton@dokker.com> wrote in message
news:dblrfe$nb4$1@ctb-nnrp2.saix.net...
Resonance can be induced to materials and system via waves or vibrations.
I
would like to use sound-waves or radio-frequencies to induce resonance in
certain material, like liqueds and solids. What equipment can I use to
achieve this? (Some sort of wave/sound/frequency generator)
Blow across the top of a beer bottle. Drink beer first!
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| User: "Llanzlan Klazmon" |
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| Title: Re: What can I use to induce RESONANCE in certain materials |
20 Jul 2005 06:42:17 PM |
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"ABF" <anton@dokker.com> wrote in news:dblrfe$nb4$1@ctb-nnrp2.saix.net:
Resonance can be induced to materials and system via waves or
vibrations. I would like to use sound-waves or radio-frequencies to
induce resonance in certain material, like liqueds and solids. What
equipment can I use to achieve this? (Some sort of
wave/sound/frequency generator)
Concert organs are good for this. Cover plenty of frequency and amplitude
range. ;0)
Klazmon.
Sorry for the stupid question, but I am not an engineer.
Thanks
Anton
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| User: "Uncle Al" |
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| Title: Re: What can I use to induce RESONANCE in certain materials |
20 Jul 2005 01:04:21 PM |
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ABF wrote:
Resonance can be induced to materials and system via waves or vibrations. I
would like to use sound-waves or radio-frequencies to induce resonance in
certain material, like liqueds and solids. What equipment can I use to
achieve this? (Some sort of wave/sound/frequency generator)
Sorry for the stupid question, but I am not an engineer.
You don't tell it, it tells you. You pick the frequency window, hope
for a decent Q, and apply a suitable signal generator in a cavity.
Off the shelf is hardware is good for subsonic, sonic, radio,
microwave, visible, UV, and x-ray/gamma ray resonances. Is
compression vs. shear excitation interesting?
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz.pdf
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| User: "Autymn D. C." |
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| Title: Re: What can I use to induce RESONANCE in certain materials |
21 Jul 2005 09:02:32 PM |
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subsonic -> infrasonic
ABF, you might want to look into Fresnel zone plates, lovely
diffractive amplifiers that take up almost no space.
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| User: "Martin" |
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| Title: Re: What can I use to induce RESONANCE in certain materials |
20 Jul 2005 11:56:43 AM |
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ABF wrote:
Resonance can be induced to materials and system via waves or vibrations. I
would like to use sound-waves or radio-frequencies to induce resonance in
certain material, like liqueds and solids. What equipment can I use to
achieve this? (Some sort of wave/sound/frequency generator)
Sorry for the stupid question, but I am not an engineer.
Thanks
Anton
Sounds an interesting set of experiments you can conduct here.
To start with, if you have a reasonably good audio amplifier and pair of
speakers you can start with this rather than investing in expensive
linear amplifers - this assumes you can start by experimenting with
audio frequencies.
Then you need a source, you're right, you need a signal generator, these
can be expensive, but you can build one or use a hobby kit (something
like Maplin if you were in the UK).
I'd get a small 'scope as well so you can see what it is you're doing,
look round electrical junk stores, you can plug a microphone into it and
actually see the kind of wave forms you are generating.
Plug the signal generator into your amplifer, set it to something like
1kHz 2V peek-peek and slowly turn up the amplifer until you can hear a
nice (hopefully pure) tone.
Check with the 'scope that it resembles a sine wave and off you go.
You can stand various fluids in different containers on top of the
speakers and watch the ripples, adjusting the frequency and volume as
you think fit. If you want to take it further you can purchase a light
strobe and tune it to a few hertz off your sample tone and see the
actual movements of the ripples slowed right down.
I know there are some short cuts here and it's not going to be
laboratory quality equipment, but for amature experimentation I think it
should be a good start and if you get excited about it you can get
better quality equipment as money suggests.
Good luck with it, you will learn a lot and maybe even discover
something unique.
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| User: "Zigoteau" |
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| Title: Re: What can I use to induce RESONANCE in certain materials |
20 Jul 2005 11:46:27 AM |
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Hi, Anton,
Resonance can be induced to materials and system via waves or vibrations.
Sure can.
I would like to use sound-waves
or radio-frequencies to induce resonance in
certain material, like liquds and solids.
Fine. It might help if you said what you wanted to do it for. If it is
just for general interest, then sound waves in the range 20 Hz - 20 kHz
have the decided advantage that you have a built-in receiving
apparatus.
What equipment can I use to
achieve this? (Some sort of wave/sound/frequency generator)
How about a guitar? You can possibly see the pattern of vibration of
the string if it's loud enough.
If your aim is what I think it is, there are lots of high-Q resonators
based on air which would be appropriate. There are penny whistles as
well as flutes, recorders, etc, and bottles half-filled with water.
For the sound source, you most probably have a music center. Most
electronic hobby shops sell a cheap signal generator which you could
use to set the frequency and amplitude, then you'll just have to get
the right connectors to feed the signal to your music center. If you've
got a PC, there are programs which allow you to use the loudpeaker
output as a signal generator.
Sorry for the stupid question, but I am not an engineer.
I may have gotten your motivation wrong. If so, apologies, and could
you explain the reason you want to use liquids and solids?
You say 'sound-waves or radio-frequencies'. These are not mutually
exclusive. It is quite possible to generate sound at MHz frequencies,
but the transducers are then specialist items. For a few hundred
dollars you can buy an ultrasonic bath which is designed to couple
sound into water. To detect the resulting acoustic field, you then need
a specialist microphone and amplifier, plus possibly an oscilloscope.
If you want to go into this scientifically, then electrical resonance
can be controlled much more closely. Not much of a role for liquids and
solids, though. There are a number of programs which will run on a PC
and allow the signal on the microphone input to be displayed on the
screen, for frequencies up to a few tens of kHz. Do a web search for
'Ines', 'Picoscope' or 'PC-based oscilloscope'.
Cheers,
Zigoteau.
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| User: "Mark Fergerson" |
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| Title: Re: What can I use to induce RESONANCE in certain materials |
21 Jul 2005 12:03:34 PM |
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Zigoteau wrote:
It is quite possible to generate sound at MHz frequencies,
but the transducers are then specialist items.
Scientific American (back when it was worth reading;
"Kilomegacycle Ultrasonics" in the June 1963 issue) had an article
about generating ultrasound in the _giga_Hertz. Just stick a big
hunk of quartz into a hole in a powered resonant microwave cavity,
and whammo- gigaHertz ultrasonic transducer. Okay, the hunk of
quartz had to be machined to provide a decent acoustic match to the
free air and aligned properly to the E field in the cavity, but some
fun might be had with a Gunnplexer and some relatively inexpensive
"jewelry-grade" quartz...
Mark L. Fergerson
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| User: "Zigoteau" |
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| Title: Re: What can I use to induce RESONANCE in certain materials |
23 Jul 2005 02:21:48 AM |
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Hi, Mark,
I understand that there is significant propagation loss of sound in air
at MHz frequencies. Surely this is a killer at GHz frequencies?
Cheers,
Zigoteau.
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| User: "Helmut Wabnig " |
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| Title: Re: What can I use to induce RESONANCE in certain materials |
20 Jul 2005 12:01:30 PM |
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On Wed, 20 Jul 2005 17:43:41 +0200, "ABF" <anton@dokker.com> wrote:
Resonance can be induced to materials and system via waves or vibrations. I
would like to use sound-waves or radio-frequencies to induce resonance in
certain material, like liqueds and solids. What equipment can I use to
achieve this? (Some sort of wave/sound/frequency generator)
Sorry for the stupid question, but I am not an engineer.
If you can't, go and raise sheep.
It is unclear from your text what you are talking of.
Just come along and try to explain
resonance of a liquid
resonance of a solid
Explain a little more in detail what you expect to find.
w.
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