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Hall effect pressure transducer

  • US 4,936,148 A
  • Filed: 10/17/1988
  • Issued: 06/26/1990
  • Est. Priority Date: 10/17/1988
  • Status: Expired due to Fees
First Claim
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1. A pressure transducer providing a voltage output which is a linear function of pressure, comprising:

  • a housing;

    a diaphragm within said housing dividing said housing into a reference pressure chamber and a sample pressure chamber, the latter adapted for receiving pressurized fluid at a selected pressure;

    said diaphragm having a pattern of depressions for providing deflection of said diaphragm along a direction coinciding with an axis of rotation thereof, said deflection closely approximating a linear output response function of the applied pressure;

    an O-ring between the periphery of said diaphragm and said housing non-fixedly sealing the periphery of said diaphragm against the interior of said housing;

    magnet means providing a uniform magnetic field gradient and comprising a pair of magnets mounted together along mating planar surfaces to the diaphragm and with their North and South axes oriented parallel and oppositely to one another and transverse to said deflection axis, for providing a uniformly varying magnetic field in the region of said interface; and

    a Hall effect sensor being mounted to the housing and closely adjacent to said magnet means and within the uniform magnetic field gradient proximate said interface.

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