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Pressure transducer

  • US 4,433,580 A
  • Filed: 07/22/1982
  • Issued: 02/28/1984
  • Est. Priority Date: 07/22/1982
  • Status: Expired due to Fees
First Claim
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1. A capacitive type pressure sensing transducer comprising:

  • (a) a first transducer body element formed of dielectric material and with two like recesses on a first planar surface thereof;

    (b) a second transducer body element formed of dielectric material and positioned in parallel relationship with said first body element adjacent the second planar face of said first element;

    (c) a first pair of like electrically conductive flat capacitor plates located between said first and second body elements and aligned with the recesses on the first planar face of said first body element;

    (d) a second pair of like electrically conductive flat capacitor plates aligned with said first pair of capacitor plates and spaced therefrom by the second tranducer body element, said first and second pairs of capacitor plates forming two plate type capacitors of like fixed electrical capacitive value; and

    (e) a pair of like electrically conductive pressure sensitive elements spanning the recesses on the first planar face of said first body element and sealed at their respective peripheries to said body element to form two like pressure chambers, said pair of pressure sensitive elements and said first pair of capacitor plates with the intervening pressure chambers and dielectric material of said first body element forming two plate type capacitors of like variable electrical capacitive value, the application of an external pressure force to said pressure sensitive elements causing deflection thereof and a change in the spacing distance between said pressure sensitive elements and said capacitor plates thereby varying the electrical capacitive value of said variable value capacitors in direct relationship to the applied pressure force value.

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