Particle sampling preconcentrator

G - Physics – 01 – N

Patent

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Details

G01N 1/22 (2006.01)

Patent

CA 2579836

An apparatus is provided for identifying trace amounts of substances of interest in an air flow. The apparatus includes an inlet for receiving the air flow and an outlet for exhausting major portions of the air flow. The outlet is offset from the inlet. A porous impactor is disposed in alignment with the inlet and is impacted by particles entrained in the air flow. The porous impactor is heated sufficiently to vaporize particles impinging thereon. A detector communicates with the porous impactor and is operative for identifying substances of interest in the vaporized particles.

L'invention concerne un dispositif permettant d'identifier dans un écoulement d'air des quantités de matières étudiées, présentes à l'état de trace. Le dispositif comprend une entrée pour recevoir le flux d'air, et une sortie pour évacuer des majeures parties de celui-ci. La sortie est décalée de l'entrée. Un impacteur poreux aligné sur l'entrée reçoit l'impact de particules entraînées par l'écoulement d'air. L'impacteur poreux est chauffé suffisamment pour vaporiser les particules qui le frappent. Un détecteur communiquant avec l'impacteur poreux permet d'identifier les matières étudiées dans les particules vaporisées.

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