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Piezoelectric ultrasonic transducers usually perform well over a wide range of receive frequencies. You didn't say what type transducer you have, but 10kHz sounds like a very friendly frequency. I would expect the transducer to accurately convert the acoustic signal into a voltage signal. If the input is a sine wave, then the output will be a sinewave.
Dear echo47,
In my circuit i am driving a transducer by a 40KHz square wave. this wave gets reflected back and is picked by a different transducer of similar kind. the output of this is a voltage waveform (sine or square I donot know).
Will the output from the receiving transducer be square or sine.
Transmitting too? Oh that's different, because a transducer usually transmits efficiently only near its resonant frequency. Then it works like a bandpass filter. Assuming its resonant frequency is 40kHz, then it would probably filter your squarewave into a sinewave. If it's resonant frequency is not 40kHz ... well ... the results could be poor.
Without knowing any details of your particular transducers, my best suggestion is to try some bench tests and see what happens!
I think it will send square wave because 40 khz is low freq in comparing with common "urtrasonic" transducers (about 1-5 mhz ) so it won't be filtered ...
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