Ultrasonic problem!

When i want to transmit echo sound through ultrasonic transducer, did the ultrasonic device acts like a switch to turn ON and OFF to generate the pulse and convert to sound wave?
Thanks a lot.

Ultrasonic transducer works like a "microphone" for reception and as a "speaker" for transmission and in the latter case you have to drive it(transducer) with an ulltrasound wave in order to transmit it(wave) ..
Some devices may have ultrasonic transducer and generator/driver built into one enclosure ..