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Method for Querying a Piezoelectric Resonator and Querying Device Implementing Said Querying Method

  • US 20100332157A1
  • Filed: 02/19/2009
  • Published: 12/30/2010
  • Est. Priority Date: 02/22/2008
  • Status: Active Grant
First Claim
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1. A method for interrogating a passive sensor comprising at least one piezoelectric resonator comprising the following steps:

  • the identification of the characteristic width of the resonant frequency band of the resonator Δ

    f0S;

    the determination of a scan interval equal to a third of the measured bandwidth Δ

    f=Δ

    f0S/3;

    a first series of three interrogation measurements with signals respectively at a first frequency (f1), at a second frequency (f2) and at a third frequency (f3) making it possible to define a first resonance value (Y1), a second resonance value (Y2) and a third resonance value (Y3);

    the determination by a parabolic fitting operation of the resonator response curve on the basis of said first, second and third resonance values, so as to calculate a first value of the frequency in real time (f01) of the resonator.

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