On Thu, 8 Feb 2001 12:25:31 -0500, you wrote:

>For the purposes of running experiments, I have the need to apply a high
>voltage 40KHz wave to an ultrasonic transducer.  The waveform could be
>sine or square (will both drive the ultrasonic)?

Yes, but hopefully you have a good acoustic conjugate impedance match at
your frequency of interest, or you will have, depending on power (<1Watt) a
broken transducer or coupling. So higher harmonics may not couple well, and
result in heating of the adhesive (silver epoxy?). Should be able to fix
that with a cap and inductor filter. I wonder if you could wrap a bifilar
(Ruthroff), resonant directional coupler for that frequency, and measure it
the way you would an RF signal?


>I could sample and do math (but 80+KHz sounds like a monster), or I
>could use one of those power meter watt calculation chips, say from
>Analog Devices.  I do not care which way, as long as I get the highest
>precision one could ask within reason.

Doesn't Microchip have an app note for a watt-hour meter, that does cosine
and power-factor conversion? As long as the signal is sinusoidal and
repetitive, it should be adaptable.
.
Scott

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