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Apparatus and method for measuring the concentration of components in fluids

  • US 4,411,741 A
  • Filed: 01/12/1982
  • Issued: 10/25/1983
  • Est. Priority Date: 01/12/1982
  • Status: Expired due to Term
First Claim
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1. An apparatus for detecting a concentration of components in a fluid, comprising:

  • a semiconductor substrate having a doping polarity;

    at least two diffusion regions located at a surface of said substrate;

    an electrically insulating layer overlying the surface of said substrate between said diffusion regions;

    a bridge member mounted to said insulating layer so as to form a gap therebetween, said bridge member allowing for passage of fluid into said gap and said bridge member being capable of having an electrical charge imposed upon it;

    means for imposing an electrical charge on said bridge member; and

    means for imposing an electrical potential between said diffusion regions.

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