Resistive gas sensing

Details Resistive gas sensing Resistive gas sensing

G - Physics

01

N

G01N 27/12 (2006.01)

Patent

CA 2188771

A resistive gas sensor has a porous semiconducting oxide body in which the pore surfaces are decorated with a precious metal. The sensor operates at ambient temperatures for detection and measurement of target gases, especially carbon monoxide. For this purpose, parameters of the oxide and of the metallic phase are defined. The sensors operate best in the dark, and may be connected in an oscillator circuit so that the output signals representing gas concentration are frequency signals.

Capteur résistif de gaz pourvu d'un corps poreux d'oxyde semi-conducteur dans lequel les surfaces des pores sont parées d'un métal précieux. Ce capteur fonctionne à température ambiante afin de détecter et mesurer les gaz cibles, notamment le monoxyde de carbone. A cet effet, on a déterminé les paramètres de l'oxyde et de la phase métallique. Les capteurs fonctionnent mieux dans l'obscurité, et on peut les connecter à un montage oscillateur de manière que les signaux de sortie représentant la concentration en gaz soient des signaux de fréquence.

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