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Acoustic vibrator with variable sensitivity to external acceleration

  • US 5,153,476 A
  • Filed: 03/11/1991
  • Issued: 10/06/1992
  • Est. Priority Date: 03/11/1991
  • Status: Expired due to Fees
First Claim
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1. An acoustic vibrator subject to external stresses comprising:

  • a substrate;

    first electrode means arranged on said substrate for creating a mechanical mode shape of said substrate, said mechanical mode shape having a predetermined characteristic frequency in the absence of external stresses, said first electrode means being electrically connected to a first external means for supplying a first group of signals; and

    second electrode means electrically connected to a second external means for supplying a second group of signals, said first and second external means being separate from each other, said second electrode means arranged on said substrate for generating bias stresses by application of electrical bias signals, said second electrode means being arranged around the first electrode means such that said electrical bias signals do not effect said mechanical mode shape, said second electrode means arranged to detect external stress on said substrate and adjust said biasing signals in response thereto;

    wherein frequency perturbations caused by external stresses are compensated for by said electrical bias voltages applied to said second electrode means.

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