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RESONANT SENSOR MEASUREMENT DEVICE

  • US 20130192372A1
  • Filed: 01/24/2013
  • Published: 08/01/2013
  • Est. Priority Date: 01/27/2012
  • Status: Abandoned Application
First Claim
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1. A device for the measurement of at least one physical variable, comprising at least:

  • a first and a second resonant sensor, one of the two resonant sensors being sensitive to a variation of the physical variable to be measured and the other of the two resonant sensors not being sensitive to a variation of the physical variable to be measured;

    means capable of imposing a same resonant frequency on the first and the second resonant sensors;

    means of measuring a phase shift between the output signals from the first and the second resonant sensors;

    in which the means capable of imposing the same resonant frequency on the first and the second resonant sensors comprise at least;

    two amplifiers, the inputs of which are connected to outputs from the first and the second resonant sensors, anda phase shift circuit, one input of which is connected to an output of one of the two amplifiers and one output of which is connected to the inputs to the first and second resonant sensors;

    or in which the means capable of imposing the same resonant frequency on the first and the second resonant sensors comprise at least;

    a differential amplifier comprising a non-inverting input connected to an output of the first resonant sensor, an inverting input connected to an output of the second resonant sensor, an inverting output connected to an input of the first resonant sensor, and a non-inverting output connected to an input of the second resonant sensor, anda first capacitor connected to the inverting output of the differential amplifier, and a second capacitor connected to the non-inverting output of the differential amplifier;

    and when the means of imposing the same resonant frequency onto the first and the second resonant sensors comprise said two amplifiers) and said phase shift circuit, the means of measuring the phase shift between the output signals from the first and the second resonant sensors are capable of measuring a phase shift between signals output onto the outputs from the two amplifiers.

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