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Ultrasonic transducer having impedance matching layer

  • US 6,307,302 B1
  • Filed: 07/23/1999
  • Issued: 10/23/2001
  • Est. Priority Date: 07/23/1999
  • Status: Expired due to Fees
First Claim
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1. A resonant type transducer comprising:

  • a vibrator body comprising piezoelectric or electrostrictive material having a first acoustic impedance associated with a resonant frequency;

    a matching layer coupled to said vibrator body and having a second acoustic impedance;

    said matching layer acoustically matching said piezoelectric or electrostrictive vibrator to a radiation medium contacting said matching layer, said radiation medium having a third acoustic impedance;

    wherein said second acoustic impedance associated with said matching layer is less than said third acoustic impedance associated with said radiation medium and greater than said first impedance associated with said resonance frequency of said vibrator body.

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