a) Piezoelectric effect

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5 Terms

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  • ultrasound


  • a sound wave with a frequency above 20kHz


2
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  • piezoelectric effect (force)


  • stretching a crystal induces an EMF

  • compressing a crystal induces an opposite polarity EMF


3
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  • piezoelectric effect (PD)


  • applying a PD causes the crystal to stretch

  • applying an opposite polarity PD causes the crystal to compress


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  • inside a transducer emitting pulses of ultrasound…


  • an alternating PD equal to the crystal’s natural frequency is applied across opposite sides of the crystal

  • the crystal repeatedly stretches and compresses

  • the crystal resonates and produces ultrasound pulses


5
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  • inside a transducer detecting pulses of ultrasound…


  • ultrasound is incident on the crystal

  • the crystal vibrates

  • an alternating EMF is generated across the crystal

  • the EMF is detected by circuits