MadSci Network: Physics

Re: can you sense a sound wave in (salinated) water by electrical resistance

Date: Wed Aug 27 17:33:57 2003
Posted By: Gus Calabrese aka puppet boy, Design Engineer
Area of science: Physics
ID: 1061934444.Ph

The short answer is " I don't Know "
The longer answer:
" What a great idea.  Definitely worth experimenting with.
I would recommend measuring the resistance by applying
an AC voltage at constant amplitude.  I recommend a frequency
of 1 to 10MHz.  Measure the current at peak voltage.
( AC prevents electrolysis of probes )

Measure the resulting samples and throw away the component
below the water-borne sound frequencies of interest.  This avoids
long and short term changes in salinity.

If you need more help, such as a block diagram or suggested electronics,
send me another message.

Gus S. Calabrese

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