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Ultrasonic transducers for on-line applications

  • US 4,713,572 A
  • Filed: 06/06/1986
  • Issued: 12/15/1987
  • Est. Priority Date: 06/06/1986
  • Status: Expired due to Fees
First Claim
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1. A transducer for transmitting ultrasound through flexible sheet material such as paper, or receiving ultrasound therefrom in an on-line application, comprising:

  • (a) a piezoelectric element having the shape of a parallelepiped with corresponding dimensions of length, width, and thickness wherein length is greater than width and width is greater than thickness, and having an electrode film deposited on first and second surfaces whose dimensions are the length and width of the element, the dimensions of the element being selected so that when a voltage pulse is applied across the first and second surfaces, the element undergoes resonant vibration, predominantly in a direction parallel to the first and second surfaces; and

    (b) a nosepiece having a joining surface that is rigidly attached to the second surface, and having a contacting surface for contact with the sheet material.

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