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BULK ACOUSTIC WAVE (BAW) SENSORS FOR LIQUID LEVEL MEASUREMENTS

  • US 20150177045A1
  • Filed: 12/19/2014
  • Published: 06/25/2015
  • Est. Priority Date: 12/24/2013
  • Status: Active Grant
First Claim
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1. A method for sensing at least one level parameter of at least one liquid in a tank, comprising:

  • providing at least one bulk acoustic wave (BAW) sensor positioned inside said tank, wherein electrodes of said BAW sensor are at least switchably connected to a positive feedback loop across an amplifier to provide an electronic oscillator;

    determining at least one acoustic viscosity measurement from an output of said electronic oscillator, wherein said output of said electronic oscillator is different when said BAW sensor contacts said liquid as compared to when said BAW sensor contacts air, anddetermining said level parameter from said acoustic viscosity measurement.

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