Apparatus, system and method for the detection of an analyte...

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G01N 1/40 (2006.01) G01N 1/24 (2006.01) G01N 1/34 (2006.01) G01N 1/22 (2006.01)

Patent

CA 2293778

An apparatus, a system and a method for the detection of an analyte in air comprising an air sampling system (1) comprising a mouthpiece (10) and a fan, a first enrichment stage (11) for enrichment of the analyte comprising a thermally regulated adsorption/desorption filter (20) creating a non-laminar gas flow for adsorption of the analyte, a heat source for heating the filter to evaporate the analyte, a second enrichment stage (30) for the further enrichment of the gaseous analyte comprising a cold trap (32) for condensing the analyte, extraction of the condensed material with a solvent, and collecting the solution, and analyzing the collected liquid sample with an analytical detection system, are disclosed. Further, an adsorption/desorption filter creating a non-laminar gas flow comprising a winding (21) of a resistance wire coated with an active material electric heating of the wire, is described. A specific application is detection of a gaseous component of explosives or mines, e.g. TNT, in air.

L'invention porte sur un appareil, un système et un procédé de détection d'un analyte dans l'air. Cet appareil comprend un système d'échantillon d'air (1) comportant un embout (10) et un ventilateur, un premier étage (11) d'enrichissement permettant d'enrichir l'analyte et comprenant un filtre (20) d'adsorption/désorption créant un écoulement de gaz non laminaire qui permet d'adsorber l'analyte, une source de chaleur qui chauffe le filtre de manière à faire évaporer l'analyte, et un second étage (30) d'enrichissement permettant d'enrichir l'analyte gazeux et comprenant un piège à condensation (32) qui condense l'analyte, un dispositif d'extraction de la substance condensée au moyen d'un solvant et un dispositif de récupération de la solution, ainsi qu'un dispositif permettant d'analyser l'échantillon liquide récupéré à l'aide d'un système de détection analytique. D'autre part, le filtre d'adsorption/désorption créant un écoulant gazeux non- laminaire comprend un enroulement (21) de fil de résistance recouvert d'un matériau actif et deux bandes de raccordement (22) chauffant électriquement le fil métallique. Cet appareil peut être utilisé spécifiquement dans la détection, dans l'air, d'un composant gazeux d'explosifs ou de mines tel que le TNT.

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