Ultrasonic Transducer interfacing help.

[rohitsay89]

Yesterday I bought an Ultrasonic Transducer pair. i am trying to work with it. i am giving a 40khz square wave 14Vpp(peak to peak) to the transmitter and trying to receive it through the receiving transducer. but cannot get any voltage at the receiver. please help me out...

 

[davenn]

without seeing your circuits I can't tell you where you may have made an error

but here is a ultrasonic transmitter and receiver circuit...

cheers
Dave

 

[Bobbywhy]

Why have you driven your transmitting transducer with a square wave? I have, after more than 25 years in specialized sonar, never heard of using a square wave drive signal! Where did you get that plan? Why not use a sine wave? Piezeoelectric materials react well to sine waves. Think about it: a square wave is really an infinite number of odd harmonics superimposed. Sound in air does not propagate by changing pressure levels from zero to maximum instantaneously.