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Vibration measuring and the apparatus therefor

  • US 3,969,927 A
  • Filed: 08/08/1974
  • Issued: 07/20/1976
  • Est. Priority Date: 08/08/1973
  • Status: Expired due to Term
First Claim
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1. A method of measuring or detecting vibration comprising uniformily contacting one of the surfaces of a piezoelectric element comprising a polarization treated polyvinylidene fluoride piezoelectric film having a metal thin film as electrodes deposited on both surfaces thereof with an object to be measured while covering the opposite surface of said piezoelectric element contacted with the object to be measured with a soft polymer film having a lower Young'"'"'s modulus than said polyvinylidene fluoride piezoelectric film, and measuring or detecting the vibration of the object by the changes in the electric field caused by the vibration of the object on the surface of said piezoelectric element.

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