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Device for measuring of acceleration by piezo-electric transducers

  • US 5,408,878 A
  • Filed: 12/09/1991
  • Issued: 04/25/1995
  • Est. Priority Date: 04/12/1990
  • Status: Expired due to Term
First Claim
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1. Device for the measurement of the acceleration of a test piece by means of piezo-electric transducer elements, said device comprising:

  • a carrier which is rigidly connectible with the test piece and has a principal axis extending in a direction parallel to the direction of the acceleration to be measured, a seismic mass supported for movement relative to the carrier and piezo-electric elements which cooperate in pairs and are coupled for excitation with the carrier and portions of the seismic mass, an electrical connection of the piezo-electric elements with each other and with a signal output, wherein loading of the piezo-electric elements by the acceleration forces of the seismic mass and the polarity of the piezo-electric elements with respect to the seismic mass are so arranged that the pyro-electric effects which are caused by heat flow from the carrier through the piezo-electric elements to the seismic mass compensate for each other, and the piezo-electric effects caused by the acceleration to be measured reinforce each other, characterized in that the carrier comprises a transverse member extending transversely relative to the principal axis and that the piezo-electric elements of each cooperating pair are installed on opposite sides of the transverse member such that each said piezo-electric element is positioned between said transverse member and a corresponding portion of said seismic mass to provide said piezo-electric elements with opposite polarity with respect to said transverse member, said piezo-electric elements being arranged for compression excitation in directions that are substantially parallel to the principal axis.

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