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Broadband piezoelectric ultrasonic transducer for radiating in air

  • US 4,677,337 A
  • Filed: 10/29/1986
  • Issued: 06/30/1987
  • Est. Priority Date: 03/16/1984
  • Status: Expired due to Fees
First Claim
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1. A broadband ultrasonic transducer arrangement for radiating and/or receiving ultrasonic energy in the medium of air comprising a plurality of piezoelectric transducer elements disposed in registry in a like plurality of substantially parallel planes and respective layers of acoustically inactive material disposed between said transducer elements and maintaining a spacing between transducer elements in adjacent planes which is substantially larger than a thickness of said transducer elements, said acoustically inactive material being dimensionally stable and having an intrinsic acoustic impedance which is lower by a factor of at least approximately eight than the intrinsic acoustic impedance of said transducer elements and having a mechanical attenuation greater than approximately 0.05, said acoustically inactive material forming at least one closed face of said transducer arrangement for emission and/or reception of ultrasonic energy.

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