Method for sensing gas composition and pressure

G - Physics – 01 – L

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G01L 9/02 (2006.01) G01N 27/14 (2006.01) G01N 27/18 (2006.01)

Patent

CA 2746335

A method for sensing gas composition and gas pressure, based on the thermal constants of a variable electrical resistor, is presented. The method for sensing gas composition and pressure consists of monitoring a variable electrical resistor whose dynamic thermal response is determined by the thermal conductivity and thermal capacity of the surrounding gas of a given atmospheric environment. In the thermal domain, the sensor has a low-pass characteristic, whose phase delay is determined by the thermodynamic characteristics of the surrounding gas such as composition and pressure. The present invention can be used as a method for sensing gas composition. The present invention can also be used as a method for sensing gas pressure.

L'invention concerne un procédé permettant de détecter la composition d'un gaz et la pression d'un gaz, sur la base des constantes thermiques d'une résistance électrique variable. Le procédé permettant de détecter la composition et la pression d'un gaz consiste à surveiller une résistance électrique variable dont la réponse thermique dynamique est déterminée par la conductivité thermique et la capacité thermique du gaz environnant d'un environnement atmosphérique donné. Dans le domaine thermique, le capteur possède une caractéristique passe-bas, dont le retard de phase est déterminé par les caractéristiques thermodynamiques du gaz environnant comme la composition et la pression. La présente invention peut servir de procédé permettant de détecter la composition d'un gaz. La présente invention peut également servir de procédé de détection de la pression d'un gaz.

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