Method and device for detecting compounds in a gas stream

Details Method and device for detecting compounds in a gas stream Method and device for detecting compounds in a gas stream

H - Electricity

01

J

H01J 49/16 (2006.01) H01J 49/40 (2006.01)

Patent

CA 2401967

The invention relates to a method and a device for detecting compounds in a gas stream, enabling a plurality of compounds in the analysis gas to be characterised almost simultaneously. The gas stream containing the compounds is guided into the ionisation chamber of a mass spectrometer and exposed to radiation with a UV laser pulse. The resulting ions are detected in the mass spectrometer. The gas stream is exposed to said radiation with said UV laser pulses at regular or irregular intervals by alternate exposure to a vacuum ultraviolet (VUV) laser pulse in the ionisation chamber, the resulting ions being detected in the mass spectrometer.

L'invention concerne un procédé et un dispositif de détection de composés dans un courant gazeux permettant de caractériser, à peu près simultanément, une pluralité de composés dans un gaz d'analyse. Le courant gazeux renfermant les composés est dirigé dans la chambre d'ionisation d'un spectromètre de masse, et irradié par impulsions laser UV, les ions prenant ainsi naissance étant détectés dans le spectromètre de masse ; en alternance au rayonnement à impulsions laser UV, le courant gazeux est irradié, à intervalles réguliers ou irréguliers, dans la chambre d'ionisation, par impulsions laser en ultraviolet sous vide (VUV), et les ions prenant alors naissance sont détectés dans le spectromètre de masse.

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