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Pressure transducer

  • US 4,327,350 A
  • Filed: 07/17/1979
  • Issued: 04/27/1982
  • Est. Priority Date: 07/17/1979
  • Status: Expired due to Term
First Claim
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1. A pressure transducer comprising:

  • a support member;

    a first flat sheet of material comprising (a) two apertures arranged so as to form a beam having first and second opposite ends and (b) a margin section which surrounds said apertures and is coextensive with the periphery of said first sheet;

    a second flat sheet having (a) an outer margin section coextensive with its periphery and (b) an inner section forming a flexible diaphragm which is surrounded by its said margin section, said second sheet being interposed between said support member and said first sheet so that said beam overlies and is spaced from said diaphragm;

    means securing said margin sections of said first and second sheets to said support member so that the ends of said beam are fixed relative to said support member and said diaphragm and beam can flex relative to said support member;

    force transmitting means coupling the approximate center of said beam to said diaphragm so that said beam will deflect responsively when said diaphragm is deflected in at least one direction; and

    at least two strain sensors on said beam responsive to the deflection of said beam, said sensors being located on one side of said beam and arranged so that when said beam deflects in said at least one direction one of said two strain sensors senses a tension change in said beam and the other of said two strain sensors senses a compression change in said beam.

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