Electrode

G - Physics – 01 – N

Patent

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Details

G01N 27/30 (2006.01) A61B 5/04 (2006.01)

Patent

CA 2229480

An electrode assembly for sensing an electrochemical signal diffused from a source to a working electrode which assembly includes a scavenging electrode is disclosed. The electrode of the invention is comprised of 1) a working electrode; 2) a scavenging electrode; and 3) an electrically insulating gap defined by adjacent edges of 1) and 2) and electrically isolating 1) and 2). The scavenging electrode substantially reduces or eliminates "edge-effects" or error in signal transported to the working electrode via a path which includes a radial vector component, i.e., eliminates chemical signal other than that which moves to the catalytic surface of the working electrode via a path which is substantially perpendicular to catalytic surface of the working electrode.

L'invention porte sur un système d'électrodes de détection d'un signal électrochimique diffusé par une source et comportant une électrode collectrice. Ledit système comporte: (1) une électrode de travail, (2) une électrode collectrice, et (3) un intervalle isolant délimité par les bords voisins de (1) et de (2) qui se trouvent ainsi isolés électriquement l'un de l'autre. L'électrode collectrice réduit sensiblement ou élimine les effets de bord ou les erreurs affectant le signal acheminé vers l'électrode de travail par un cheminement comportant une composante constituée d'un vecteur radial, c.-à-d. qu'elle élimine les signaux chimiques autres que ceux qui progressent vers la surface catalytique de l'électrode de travail par un cheminement sensiblement perpendiculaire à la surface catalytique de l'électrode de travail.

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