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Author Topic: What sensor to measure liquid alcohol?  (Read 1818 times)
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Anyone have any ideas on what type of sensor I should use to measure the alcohol percent in vodka or other booze? If I were at a bar and ordered a shot of straight booze (nothing with sugar or sugar added) what sensor could I use to confirm the strength?  Liquid is the key, not vapor.
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I don't think you connected the grounds, Dave.
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Gunpowder is a tried and tested method.
Might raise (and singe) a few eyebrows though.
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I'm looking for something with a bit greater sensitivity range and that does not contaminate the sample.   The fun factor certainly drops though.
« Last Edit: December 19, 2011, 03:52:24 pm by leehelzer » Logged

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I'd go the conductance route. Simple, cheap, easy. May even work.
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Capacitative measurement might well work at low voltages - water has a dielectirc constant of around 80 at room temp, while alcohol is closer to 35.  A 40% spirit will therefore have a dielectric constant 22%-ish lower than pure water.
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The simplest test for alcohol purity is a hydrometer.  Does not affect the product and requires no external power supplies but is slightly influenced by product temperature.
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