Ultrasonic Transducer interfacing help.

AI Thread Summary
An individual is attempting to interface an ultrasonic transducer pair by applying a 40kHz square wave at 14Vpp to the transmitter but is not receiving any voltage at the receiver. A responder questions the use of a square wave, suggesting that a sine wave would be more effective due to the nature of piezoelectric materials. The responder emphasizes that square waves contain multiple harmonics, which may not propagate sound effectively. They recommend reconsidering the drive signal to improve performance. The discussion highlights the importance of using appropriate waveforms for ultrasonic applications.
rohitsay89
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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...
 
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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...

attachment.php?attachmentid=50867&stc=1&d=1347773619.jpg


attachment.php?attachmentid=50868&stc=1&d=1347773609.jpg


cheers
Dave
 

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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.
 
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