Device and method for pneumatic gas sampling for gas sensors

Details Device and method for pneumatic gas sampling for gas sensors Device and method for pneumatic gas sampling for gas sensors

G - Physics

01

N

G01N 1/24 (2006.01) B01D 46/10 (2006.01) B01D 53/30 (2006.01) G01N 1/00 (2006.01) G01N 1/22 (2006.01) G01N 7/00 (2006.01) G01N 31/00 (2006.01) G01N 33/00 (2006.01) G01N 33/22 (2006.01) G01N 1/34 (2006.01)

Patent

CA 2413940

Apparatus and method for detecting presence of an analyte in ambient air. The apparatus comprising a valve for admitting ambient air, a line for conveying the air to a sensing element, a housing for isolating the environment around the sensing element, an inlet port for flowing the air to the sensing element in a turbulent flow in a direction substantially perpendicularly to the sensing element, an outlet port for conveying the air from sensing element, and a pump (112) in communication with the outlet port for providing suction for drawing the air to the sensing element. The method includes the steps of drawing in ambient air that may contain an analyte, projecting the air at a sensing element in a turbulent flow by flowing the air at the sensing element, the sensing element having on its surface a chemoselective material that selectively interacts with the analyte, and detecting the interaction of the analyte with the sensing element.

L'invention concerne un appareil et un procédé de détection de la présence d'un analysat dans l'air ambiant. L'appareil comprend une soupape d'admission de l'air ambiant, une ligne de transport de l'air vers un élément de détection, un boîtier d'isolation de l'environnement situé autour de l'élément de détection, un port d'entrée permettant l'écoulement de l'air vers l'élément de détection, de façon turbulente, dans une direction sensiblement perpendiculaire à cet élément, et une pompe (112) en communication avec le port de sortie permettant l'aspiration de l'air dudit élément. Le procédé de l'invention consiste à aspirer de l'air ambiant pouvant contenir un analysat, à projeter, de façon turbulente, cet air vers l'élément de détection, cet élément possédant sur sa surface un matériau chimiosélectivif qui interagit avec l'analysat, et à détecter l'interaction de l'analysat avec l'élément de détection.

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