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Capacitor and pressure transducer

  • US 5,230,250 A
  • Filed: 09/03/1991
  • Issued: 07/27/1993
  • Est. Priority Date: 09/03/1991
  • Status: Expired due to Fees
First Claim
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1. A dual capacitor device for utilizing dependent capacitances for measurement purposes comprising:

  • an upper capacitor base member and a fixed lower capacitance base member arranged with parallel capacitor surfaces in horizontal planes where said parallel capacitor surfaces are located on opposite sides relative to a vertical central axis and said capacitance surfaces define first and second capacitors;

    said lower capacitor base member having a centrally located section connected to an outer section of said lower capacitor base member by a torsion beam member, said centrally located section being attached to said upper capacitor base member by a vertical arm member;

    said torsion beam member having a displacement axis normal to said central axis so that angular displacement of said torsion beam member and said centrally located section about said displacement axis produces a capacitance change in said first and second capacitors; and

    force means coupled to said centrally located section in a diametrically located position to said torsion beam member for producing a torsion moment force on said torsion beam member for developing angular displacement of said centrally located section and a capacitance change as a function of said torsion moment force.

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