Gas sensor with phased heaters for increased sensitivity

Details Gas sensor with phased heaters for increased sensitivity Gas sensor with phased heaters for increased sensitivity

G - Physics

01

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G01N 30/12 (2006.01) G01N 1/40 (2006.01) G01N 1/44 (2006.01) G01N 33/00 (2006.01) G01N 1/22 (2006.01) G01N 30/30 (2006.01)

Patent

CA 2380477

A concentrator and sensor assembly are disclosed that use phased heaters to multiply the concentration levels that can be eluted, relative to operation with a single interactive element having a sorbent material to increase the concentration of desired gas constituents at a detector. This is accomplished here by providing two or more interactive concentrator elements that are selectively heated in a time phased sequence so that each of the interactive elements becomes heated and desorbs gas constituents into the sample fluid stream at substantially the same time that an upstream concentration pulse, produced by heating one or more upstream interactive elements, reaches the interactive element. This produces a multiplication effect that significantly increases the concentration of the gas constituents at the detector, thereby increasing the effective sensitivity of the detector.

L'invention concerne un ensemble concentrateur et capteur, qui utilisent des dispositifs de chauffage en phase permettant de multiplier les niveaux de concentration pouvant être élués, en ce qui concerne le fonctionnement d'un seul élément en interaction comprenant un matériau sorbant permettant d'augmenter la concentration des constituants gazeux souhaités au niveau d'un détecteur. Pour cela, au moins deux éléments de concentrateur interactifs sont chauffés de façon sélective dans une séquence en phase dans le temps, de façon que chacun des éléments interactifs soient chauds et désorbent les constituants gazeux dans le flux de fluide d'échantillonnage, sensiblement au même moment qu'une impulsion de concentration amont, produite par le chauffage d'un ou de plusieurs éléments interactifs amont, atteint l'élément interactif. Il en résulte un effet multiplicateur augmentant de façon significative la concentration des constituants gazeux au niveau du détecteur, et ainsi, la sensibilité du détecteur.

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