Electronics > Beginners
Ultrasonic transducers.
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Berni:
Yes its something along those lines. I think it also has to do with some of the material properties not being completely linear.

But for your application it sounds like a MEMS microphone is the way to go mainly because they have a resonably flat freqency response while these ultrasonic distance measurement transducers are designed to only be used at the resonan't frequency so will generally have a frequency response with a huge peak in the middle.
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