Method of measuring the flux of a soil gas

G - Physics – 01 – F

Patent

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G01F 1/00 (2006.01) G01N 13/00 (2006.01) G01V 9/00 (2006.01)

Patent

CA 2746698

A method for determining a flux of a gas contained in a medium through a boundary of the medium comprises 1) measuring at least twice with a probe a concentration C of the gas over a time interval .about.t and 2) determining the flux of the gas using the following mathematical equation: (I) where F is the gas flux, D is the diffusivity value and .about.C is a variation in the gas concentration during the time interval .about.t. The probe is placed proximate the boundary. The probe has a gas inlet, a cavity, a gas concentration sensor and a membrane. Each element is in fluid communication with each other so that the gas flows from the gas inlet through the membrane and contacts the gas concentration sensor.

Procédé pour déterminer un flux de gaz contenu dans un milieu à travers une limite du milieu, comprenant les étapes suivantes : 1) mesurer au moins deux fois à l'aide d'une sonde une concentration C du gaz sur un intervalle de temps ?t, et 2) déterminer le flux du gaz en utilisant l'équation mathématique suivante : où F est le flux de gaz, D est la valeur de capacité de diffusion, et ?C est une variation de la concentration de gaz pendant l'intervalle de temps ?t. La sonde est placée à proximité de la limite. La sonde comprend une entrée de gaz, une cavité, un capteur de concentration de gaz et une membrane. Chaque élément est en communication fluidique avec les autres de telle sorte que le gaz s'écoule de l'entrée de gaz à travers la membrane et entre en contact avec le capteur de concentration de gaz.

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