I think that getting 12 bits out of it is not realistic for something that
is not lab equipment and individually adjusted. I think that you can
calibrate the output power vs. drive voltage for each transducer and
amplifier and get away with just measuring input power to the amplifier
during use. The calibration curve should correct for any changes in
efficiency with varying drive, temperature, etc. Aging may also play a
role in efficiency. I think that this is much simpler than measuring
active power on a 80 kHz wave that can be very much out of phase when the
transducer is not coupled to the medium.

The other way is to measure actual power output using an external sensor.

I am not an ultrasonics old hand, though.

Peter

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