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Digital pressure transducer

  • US 4,455,874 A
  • Filed: 12/28/1981
  • Issued: 06/26/1984
  • Est. Priority Date: 12/28/1981
  • Status: Expired due to Term
First Claim
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1. A transducer for providing an electrical signal having a frequency indicative of a differential fluid pressure, comprising:

  • a resilient, elongated pressure vessel having at least one closed end, said pressure vessel having an interior and an exterior between which said differential pressure is applied, said pressure vessel having a nonsymmetrical configuration so that it bends responsive to variations in said differential pressure; and

    a force-sensitive crystal resonator generating said electrical signal, said resonator having at least one resonant element connected between a pair of mounts, said resonant element having sufficient compressional stiffness that its resonant frequency is dependent on the elastic properties of said resonant element and the compression or tension applied to said resonant element so that the frequency of said electrical signal is a function of the force applied to said resonator through said mounts, said mounts being coupled to said pressure vessel so that the force applied to said resonant element varies in accordance with said differential pressure.

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