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[DPRG] Measuring Speed of sound in a liquid

Subject: [DPRG] Measuring Speed of sound in a liquid
From: Bill Boyer daweasel at swbell.net
Date: Fri Sep 3 06:25:31 CDT 2004

120 kHz, I believe.

They also run alot of power so they can read depths of 100 feet or more.

And actually, you can couple a standard transom-mount depth finder
sensor through the bottom of a fiberglass boat by suspending it in a
pipe filled with mineral oil glued to the bottom of the hull.

> It is a way to tell the percentage of one chemical in another.  There are a 
> few ways, refractometer is one ($15K-$25K). The speed of sound through the 
> liquid is another. pH is another method but is not as accurate and the 
> probes could contaminate the solution. Conductivity is a fourth option but 
> again it is not as accurate and the probes could contaminate the sample by 
> adding a metal to it.
> 
> It is to replace a system that currently uses titration.  Take a sample add 
> a reagent to it, then add another chemical until the color 
> changes.  Problem is that it wastes an expensive chemical. (They are 
> currently sampling only 1 time per hour to try to keep the expense down.)
> 
> The problem is finding a membrane that will pass the high frequency sound 
> waves, but not interact to bases or acids.  See water is a problem with 
> corrosion, but this environment is worse.  I do not know what frequency 
> depth sounders use.



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