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Acceleration sensor with oppositely-polarized piezoelectric plates

  • US 5,473,930 A
  • Filed: 02/06/1995
  • Issued: 12/12/1995
  • Est. Priority Date: 10/26/1991
  • Status: Expired due to Fees
First Claim
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1. A testable acceleration sensor comprisinga base (3);

  • at least one piezoelectric element (1), mounted on said base (3), and formed as a sandwich structure of at least two piezoelectric plates (2) superposed on each other and having respective opposite polarizations, and an intermediate solid layer (10) mechanically interconnecting said plates; and

    at least two electrodes (9) applied to each of first and second lateral portions (11a, 11b) of said piezoelectric element;

    wherein,said lateral portions (11a, 11b) are electrically isolated from each other by an air gap (13) but are mechanically coupled to each other by a mechanical bridging means (12); and

    the sensor is testable by applying an electrical voltage to electrodes on said second lateral portion (11b), thereby causing a bending deformation of said element (1), said bending deformation giving rise to a test signal which is detectable at electrodes (9) on said first lateral portion (11a).

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