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Science Experiments
Cello vibrations and how a violin bow works - Garage Science
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Cello vibrations and how a violin bow works - Garage Science
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thedoc
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Cello vibrations and how a violin bow works - Garage Science
«
on:
13/07/2010 14:44:25 »
For this week's kitchen science I took some high speed footage of some cello strings but there were some fascinating effects which didn't really fit into the kitchen science, so I thought I would post them here.
Read more about this experiment.
Garage science is a blog of science experiments you probably can't or shouldn't do at home
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Last Edit: 13/07/2010 14:44:25 by _system
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RD
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Cello vibrations and how a violin bow works - Garage Science
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Reply #1 on:
09/03/2009 12:35:42 »
If you don't mind getting flour/talc on your cello you could try to obtain Chladni patterns...
[ Invalid Attachment ]
http://en.wikipedia.org/wiki/File:Chladni_guitar.png
http://en.wikipedia.org/wiki/Ernst_Chladni#Chladni_plates
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Last Edit: 09/03/2009 12:37:39 by RD
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Chemistry4me
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Cello vibrations and how a violin bow works - Garage Science
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Reply #2 on:
10/03/2009 05:01:46 »
Neat little new Board you've got here. [
]
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Physics, Experiments
Cello vibrations and how a violin bow works - Garage Science
«
Reply #3 on:
11/03/2009 13:21:52 »
I had a go at looking for the chaladni patterns directly with the high speed camera but I think the movements were far too small to be visible. My housemate who owns the cello wouldn't be keen on covering it with sand...
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BenV
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Cello vibrations and how a violin bow works - Garage Science
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Reply #4 on:
11/03/2009 13:43:47 »
I've got a 'spare' acoustic guitar you can test it on...
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RD
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Cello vibrations and how a violin bow works - Garage Science
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Reply #5 on:
11/03/2009 13:44:37 »
It may be possible to use interferometry to record the minute movements of the cello's surface e.g. reflecting a laser off it, (use a diverging lens to create a cello sized disc of monochromatic light), and record the changing interference patterns on camera...
http://www.wim.ma.htwg-konstanz.de/de/inhalt/50_Studierende/20_Studien-,%20Bachelor%20und%20Projektarbeiten/Poster_Speckle_Interferometrie_Grundler_2.pdf
http://www.h.amu.cz/zvuk/studio/dokumenty/Lit145.pdf
http://en.wikipedia.org/wiki/Laser_Doppler_Vibrometer
(No sand, talc or flour required)
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Last Edit: 11/03/2009 13:54:41 by RD
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daveshorts
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Physics, Experiments
Cello vibrations and how a violin bow works - Garage Science
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Reply #6 on:
11/03/2009 16:26:03 »
Yes a guy I know who does some science lectures called Mark Lewney did a PhD on this subject. However It would require quite a powerful laser to make it work - or I guess a strobed much less powerful laser and a long exposure time.
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RD
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Cello vibrations and how a violin bow works - Garage Science
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Reply #7 on:
12/03/2009 00:58:35 »
No indication of the power of the laser used on this guitar, (image published 1983)...
[ Invalid Attachment ]
http://books.google.co.uk/books?id=iiCZwwFG0x0C&pg=PA225
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Last Edit: 12/03/2009 01:01:33 by RD
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daveshorts
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Physics, Experiments
Cello vibrations and how a violin bow works - Garage Science
«
Reply #8 on:
30/07/2009 09:56:31 »
From Mark Lewney
"
Since you ask about their origin, they were made in the Cardiff Uni
acoustics lab using a powerful green YAG laser (can't remember the exact
power - think it averaged a few kW). In fact, I once blew the power amp
on it: holograms need silence, since if the whole object shakes more than
a quarter wavelength you see diddly squat. The fan on this thing was
making quite a racket, so I muffled it with my coat during exposure, then
remembered to remove it afterwards.
Until the time I forgot. Those big capacitors make a hell of a mess when
they get so hot they explode."
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