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Ultrasonic probe

  • US 4,101,795 A
  • Filed: 06/17/1977
  • Issued: 07/18/1978
  • Est. Priority Date: 10/25/1976
  • Status: Expired due to Term
First Claim
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1. An ultrasonic probe for ultrasonic inspection equipments, comprising:

  • a plurality of transducer elements, each being a rectangular plate of a piezoelectric material with front and back electrode films respectively coated on front and back surfaces thereof, said plate having a width-to-thickness ratio of not greater than 0.8, said transducer elements being arranged in a row at intervals with their longer sides opposite to each other so that said plate can make a width extensional vibration as a fundamental vibration mode; and

    an acoustic impedance matching layer, consisting of a uniformly thick inner layer of a first material placed on said row of said transducer elements to intimately cover said front electrode films of all the transducer elements and a uniformly thick outer layer of a second material placed on said inner layer to intimately cover the outer surface of said inner layer,the acoustic impedance of said first material being 2.5 to 9.5 times as large as the acoustic impedance of an object of ultrasonic inspection, the acoustic impedance of said second material being smaller than the acoustic impedance of said first material but is 1.6 to 2.7 times as large as the acoustic impedance of said object.

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