transmiting and capturing ultrasound

hello everybody,
I have a question.I want to use an arduino with a sensor on it for transmiting an ultrasound sinewave,and use another arduino for capturing this ultrasound sinewave for further proccesing.Is it possible and if yes any ideas ?
thank you

If by "capturing" you mean, analogue sampling the 40kHz output of the receiving transducer at better than Nyquist, then the answer is "no".