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Apparatus to measure volume

by saplingg
Tags: apparatus, measure, volume
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saplingg
#1
Apr19-07, 10:18 AM
P: 27
Could anyone recommend a piece of lab apparatus which will measure the volume of an irregular object? I cannot use displacement of water as the object will compress under pressure and I suspect submerging the object in water will give a different displacement from the actual volume at 1 atm.

Ideally I would use something that could measure volume optically... Anybody know of an apparatus which does that?
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berkeman
#2
Apr19-07, 10:31 AM
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If you know its density, you could just weigh it.

Otherwise, you could use a 3-D digitizing device to digitize its outline. I've seen them in the past, but will have to do a quick search to see if I can find one. It's like a wand mounted on an articulated arm with rotary and linear encoders to pick up where the tip of the wand is.

I don't think you'll be able to do it optically in the general case. If your object is always convex, then you could probably do it optically with a laser grid projected on the object, and a TV camera picking up the image as you rotate it.
berkeman
#3
Apr19-07, 10:33 AM
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Wow, I just did a google search on 3D Digitizer, and got a bzillion hits. Here's one:

http://3ddigitalcorp.com/escan.htm

They do it optically. And here's an article about doing it with a wand:

http://lear.inrialpes.fr/people/trig...os/aritaki.pdf

saplingg
#4
Apr19-07, 10:50 AM
P: 27
Apparatus to measure volume

Thanks alot! that's just what i needed.


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