Pressure-invariant trace gas detection

G - Physics – 01 – N

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G01N 21/39 (2006.01) G01J 3/433 (2006.01) G01N 21/35 (2006.01)

Patent

CA 2680798

An apparatus for detecting a concentration of a trace target gas in a sample gas comprises a light source (110), for example a tunable diode laser, for emitting light at a wavelength corresponding to an absorption line of the target gas and means (105) operatively connected to said light source for modulating the wavelength of the emitted light, a detector (125) positioned to detect the intensity of light emitted from the light source that has passed through the sample gas at a multiple of the modulation frequency of the light source, for example second harmonic detection, a pressure sensor (120) for detecting the pressure of the sample gas, and a control unit (135) coupled to the detector, the pressure sensor, and the light source, said control unit being arranged to adjust the modulation amplitude' of the light source based on the detected pressure.

L'invention concerne un système qui comprend une source lumineuse, un détecteur, au moins un capteur de pression et une unité de commande. La source lumineuse émet de la lumière à une longueur d'onde correspondant sensiblement à une ligne d'absorption d'un gaz étudié. Le détecteur est positionné de manière à détecter l'intensité de la lumière émise par la source lumineuse ayant traversé le gaz étudié. Le capteur de pression détecte la pression du gaz étudié. Le circuit de commande est couplé au détecteur et à la source lumineuse afin de régler l'amplitude de modulation de la source lumineuse selon la pression détectée par le(s) capteur(s) de pression. Des systèmes, un dispositif des procédés et/ou des articles associés sont également décrits.

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