Means and method for nonuniform poling of piezoelectric transducers

Patent · Tue Oct 09 04:00:00 EDT 1990

OSTI ID:867548

Hsu, David K ^[1]; Margetan, Frank J ^[1]; Hasselbusch, Michael D ^[1]; Wormley, Samuel J ^[1]; Hughes, Michael S ^[1]; Thompson, Donald O ^[1]

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1. Ames, IA

An apparatus and method for nonuniform poling of piezoelectric transducers includes machining one or more indentation into an end of a piezoelectric rod and cutting the rod to present a thickened disk shape. Highly electrically conductive material is deposited on at least the indentations in the one end and on at least portions of the opposite face of the member. One or more electrodes are configured to matingly fit within the indentations on the one face of the disk, with a like number of electrodes being positionable on the opposite face of the material. Electrical power is then applied to the electrodes in desired amounts, polarity, and duration. The indentations vary the electrical field produced within the piezoelectric material to produce nonuniform poling in the material. The thick disk is then cut to remove the indentations and to present a thin, flat two sided disk for installation in a conventional piezoelectric transducer probe. The indentations are selected to produce poling in accordance with desired transducer response profiles such as Gaussian or Bessel functions.

• Research Organization: Ames Laboratory (AMES), Ames, IA; Iowa State University, Ames, IA (US)
• DOE Contract Number: W-7405-ENG-82
• Assignee: Iowa State University Research Foundation, Inc. (Ames, IA)
• Patent Number(s): US 4961252
• Application Number: 07/447,831
• OSTI ID: 867548
• Country of Publication: United States
• Language: English

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/29/264/310/
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