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Hermetically sealed hydrophones with very low acceleration sensitivity

  • US 10,001,574 B2
  • Filed: 12/21/2015
  • Issued: 06/19/2018
  • Est. Priority Date: 02/24/2015
  • Status: Active Grant
First Claim
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1. A hydrophone comprising:

  • a single piezoelectric crystal ring poled in the shear mode in the axial direction, said ring having an inner surface and an outer surface;

    a metallic inner crystal support epoxied to the inner surface of the piezoelectric ring, said inner crystal support having an inertial mass;

    a metallic outer crystal support epoxied to the outer surface of the piezoelectric ring, said outer crystal support having an inertial mass;

    a metallic inner support shoe epoxied to the inner crystal support, said inner support shoe having an inertial mass;

    a metallic outer support shoe epoxied to the outer crystal support, said outer support shoe having an inertial mass;

    wherein a combined inner inertial mass of the metallic inner crystal support and the metallic inner support shoe is substantially the same as a combined outer inertial mass of the metallic outer crystal support and the metallic outer support shoe, and configured to provide no net shear force on the crystal ring during acceleration but provides a net shear force in response to an acoustic pressure.

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