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Reversible sensor for detecting solvent vapors

  • US 5,417,100 A
  • Filed: 03/10/1993
  • Issued: 05/23/1995
  • Est. Priority Date: 03/10/1993
  • Status: Expired due to Term
First Claim
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1. A fugitive emissions sensor for reversibly detecting solvent vapors comprising:

  • (a) a dielectric substrate having a major surface;

    (b) a pair of electrically conductive electrodes disposed on said major surface of said substrate, said electrodes each comprising a plurality of fingers interdigitated with the other electrode; and

    (c) a composite coating covering the interdigitated electrodes and comprising (1) a conductive polymer, said polymer having a conductivity in the range of 10-6 to 1 S/cm, and (2) a dielectric polymer with an affinity for said solvent vapors to be detected, the ratio of said conductive polymer to said dielectric polymer ranging from about 1;

    1 to 1;

    5.

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