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Pendular non-servoed tuning beam accelerometer

  • US 4,939,935 A
  • Filed: 02/21/1989
  • Issued: 07/10/1990
  • Est. Priority Date: 02/22/1988
  • Status: Expired due to Fees
First Claim
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1. Pendular accelerometer comprising a base, a pendular seismic mass of flat shape connected to the base by a flexure hinged connection for pivotal movement of said seismic mass about a hinge axis perpendicular to major surfaces of said pendular seismic mass, along a sense direction perpendicular to the hinge axis of the hinged connection and sensor means connecting the seismic mass to the base, wherein said sensor means comprises:

  • at least two vibrating beams of piezo-electric material, each connected to the base at an end thereof and to the seismic mass at the other end thereof, and each provided with electrode means for vibrating the respective beam at a tuning frequency thereof, said beams being directed orthogonally to the same axis and being located symmetrically with respect to the seismic mass on both sides of the hinge axis of the hinged connection, whereby any acceleration along the sense axis creates tractive stresses in one beam and compression stresses in the other beam, andcircuit means connected to the electrodes and arranged for delivering a signal which is responsive to the difference between the resonant frequencies of the two beams when said seismic mass is subjected to an acceleration.

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