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Pressure sensor system

  • US 4,875,368 A
  • Filed: 12/22/1988
  • Issued: 10/24/1989
  • Est. Priority Date: 09/08/1987
  • Status: Expired due to Fees
First Claim
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1. A measurement system comprising:

  • measurement transducer means for measuring pressure as a function of displacement of capacitor plate members in said transducer means relative to one another and to a displacement axis;

    bellow means aligned and coupled to said transducer means for displacement relative to said displacement axis, said bellow means having an interior space space for receiving fluid for pressure measurement;

    housing means enclosing said bellow means and said transducer means whereby fluid under pressure, when applied to the interior space of said bellow means produces displacement of said bellow means and said transducer means relative to said displacement axis as a function of the fluid under pressure;

    said bellow means and said transducer means being attached to opposite ends of said housing means so that said transducer means is in compression in a static condition; and

    said transducer means being constructed of a material which when subjected to compression has a relatively small displacement along said displacement axis as compared to the displacement of said bellow means and where said material responds to compression forces applied by said bellow means with repeatable elastic characteristics and has a low temperature coefficient of expansion.

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