Fluid presence and qualitative measurements by transient...

G - Physics – 01 – N

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G01N 27/02 (2006.01) G01N 27/22 (2006.01) G01R 27/08 (2006.01) G01R 27/26 (2006.01) G01N 27/60 (2006.01)

Patent

CA 2477594

An apparatus and method for obtaining a measurement of various qualities of an electrochemical cell (12). The apparatus includes first (9) and second (10) electrodes and an excitation source (8) for providing a time varying excitation voltage to the first electrode (9). The excitation voltage (8) is switched between two voltage levels with the first and second voltages alternately applied to the first electrode for predetermined times. An external capacitance (Cout) is connected between the second electrode (10) and ground. The apparatus is capable of determining the time related rates at which electrical charge is transferred from the first electrode (9) to charge the external capacitance (Cout). These rates, here termed Transient Immitivity Response (TIR), may be provided as a digital or analog output (11).

L'invention concerne un appareil et un procédé permettant d'obtenir un mesure concernant différentes qualités d'une cellule électrochimique (12). L'appareil comprend une première (9) et une seconde (10) électrodes et une source d'excitation (8) destinée à fournir une tension d'excitation variable dans le temps à la première électrode (9). La tension d'excitation (8) est commutée entre deux niveaux de tension, les première et seconde tensions étant appliquées de façon alternative à la première électrode selon des durées déterminées. Un condensateur externe (Cout) est connecté entre la seconde électrode (10) et la terre. L'appareil est capable de déterminer les cadences temporelles auxquelles les charges électriques sont transférées de la première électrode (9) afin de charger le condensateur extérieur (Cout). Ces cadences, nommées ici réponses <= d'immitivité >= transitoire (TIR) peuvent être obtenues sous forme de sortie numérique ou analogique (11).

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