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Reference electrode of insulated gate field effect transistor

  • US 4,269,682 A
  • Filed: 12/11/1978
  • Issued: 05/26/1981
  • Est. Priority Date: 12/12/1977
  • Status: Expired due to Term
First Claim
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1. A system for measuring chemical properties of substances in an electrolyte solution, comprising:

  • a measuring unit comprising an insulated gate FET which selectively detects specific chemical substances;

    a reference electrode comprising an insulated gate FET whose gate region is overlayed with a membrane, said membrane consisting of a hydrophobic organic polymeric membrane material that is impermeable to the electrolyte solution, free of an ionic dissociate group and insensitive to chemical properties of the solution;

    a pseudo reference electrode formed of a good electrical conductor which applies bias to each FET transducer and fixes the electric potential of the electrolyte solution.

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