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    Publication Date: 2019-07-13
    Description: Trapped-energy focusing transducers operating in the 2-5 MHz range have been fabricated by plating concentric rings of electrodes on a piezoelectric plate. The concentric ring structure acts as a Fresnel lens and can be used to obtain excellent lateral focusing of ultrasonic waves. The trapping is sufficiently strong to permit optimization of electrode spacings to suppress spurious virtual foci and ring sidelobes.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: International Symposium on Acoustical imaging. Visualization and characterization; December 3-6, 1979; Houston, TX
    Format: text
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