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MEASUREMENT OF FLUID FLOW

  • US 3,636,767 A
  • Filed: 06/10/1968
  • Issued: 01/25/1972
  • Est. Priority Date: 06/16/1967
  • Status: Expired due to Term
First Claim
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1. Apparatus for sensing the rate of fluid flow through a conduit, comprising flow responsive means rotatably mounted within the conduit for transforming fluid motion into rotational motion;

  • magnetic means mounted on said flow responsive means for producing a time varying magnetic field proportional to the rate of flow of the fluid;

    input potential means for providing a source of electrical energy;

    output signal circuit means for indicating the rate of flow of the fluid; and

    field responsive means mounted adjacent said flow responsive means for providing electrical energy in the form of an output signal responsive to the time varying magnetic field by modulating the electrical energy from said input potential means, said field responsive means including at least one magnetoresistive element of semiconductor material, each said magnetoresistive element having a single input lead connected to said input potential means and a single output lead connected to said output signal circuit means to cause substantially all the energy supplied to said output signal circuit means by said field responsive means to be derived from said input potential means.

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