Can ultrasonic transmitting probe and receiving head be common? What kind of probe is used in the single-probe ultrasonic ranging circuit?

The piezoelectric ultrasonic generator actually works by using the resonance of the piezoelectric crystal. It has two piezoelectric wafers and a vibrating plate. When a pulse signal with a frequency equal to the natural vibration frequency of the piezoelectric wafer is applied to its two poles, the piezoelectric lens will vibrate and drive the vibrating plate to vibrate, thus generating ultrasonic waves. On the contrary, if no voltage is applied between the two electrodes, when the vibrating plate receives ultrasonic waves, the vibrating plate will press the wafer to vibrate and convert mechanical energy into electrical signals. Then she became an ultrasonic receiver.