Multi-electrode gas sensors and methods of making and using...

Details Multi-electrode gas sensors and methods of making and using... Multi-electrode gas sensors and methods of making and using...

G - Physics

01

N

G01N 27/12 (2006.01) G01N 33/00 (2006.01)

Patent

CA 2213402

A resistive gas sensor has a gas sensing layer (11) overlaid as a layer on an array of electrodes (12, 14, 16) with unequal gaps (22,24) between them. Signals from the different electrodes represent resistances in different regions of the sensing layer. The layer is applied as a succession of sub-layers, with application of each sub-layer modifying the microstructure of the preceding sublayers. The resulting variation in microstructure within the sensing layer (11) is used for distinguishing between a reactive gas and a less reactive gas. The sensor has domestic application for carbon monoxide detection.

La présente invention vise un détecteur de gaz résistif constitué d'une couche sensible (11) recouvrant un réseau d'électrodes (12, 14, 16) disposées à intervalles irréguliers (22, 24). Les signaux émis par les différentes électrodes font office de résistances disséminées dans différentes parties de la couche sensible. Cette couche sensible est réalisée en une série de sous-couches successives, chacune modifiant la microstructure de la précédente. Cette variation de microstructure dans la couche sensible (11) permet de faire la distinction en un gaz réactif et un gaz qui l'est moins. L'appareil objet de la présente invention peut être utilisé à des fins domestiques pour la détection d'oxyde de carbone.

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