Ultrasonic Transducer interfacing help.

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SUMMARY

The discussion centers on interfacing ultrasonic transducers, specifically a transmitter and receiver pair. The user reports supplying a 40kHz square wave at 14Vpp to the transmitter but fails to receive any voltage at the receiver. Expert advice highlights the inefficacy of using a square wave for driving the transducer, suggesting instead the use of a sine wave for optimal performance due to the piezoelectric materials' response characteristics.

PREREQUISITES
  • Understanding of ultrasonic transducer operation
  • Knowledge of waveform types, specifically sine and square waves
  • Basic electronics principles, including voltage and frequency
  • Familiarity with piezoelectric materials and their applications
NEXT STEPS
  • Research the advantages of sine wave driving for ultrasonic transducers
  • Explore circuit designs for ultrasonic transmitter and receiver setups
  • Learn about piezoelectric material properties and their impact on sound propagation
  • Investigate signal generation techniques for producing clean sine waves
USEFUL FOR

Electronics hobbyists, engineers working with ultrasonic sensors, and anyone involved in designing or troubleshooting ultrasonic transducer systems.

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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