G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 21/35 (2006.01)
Patent
CA 2597457
A gas concentration measuring apparatus of high sensitivity utilizing a gas correlation method capable of simultaneously measuring multiple analyte gas concentrations, wherein use is made of infrared source (2), such as infrared semiconductor diode or quantum cascade laser, to thereby increase the intensity of collimated infrared rays (5) and decrease infrared rays not needed for measuring so as to improve the S/N ratio, thereby attaining a sensitivity enhancement. Multiple analyte gases are simultaneously measured by means of a gas correlation filter composed of reference gas cell (6a) wherein multiple analyte gases are wholly charged and probe gas cell (6b) wherein all other analyte gases excluding the above multiple analyte gases are charged.
La présente invention concerne un appareil de mesure de la concentration gazeuse de sensibilité élevée utilisant un procédé de corrélation gazeuse pouvant mesurer simultanément des concentrations gazeuses d~analytes multiples, dans lequel on utilise une source d~infrarouges (2), telle qu~une diode semi-conductrice à infrarouges ou un laser en cascade quantique, afin d~augmenter ainsi l~intensité des rayons infrarouges collimatés (5) et de réduire les rayons infrarouges inutiles pour la mesure de manière à améliorer le rapport signal/bruit, donnant ainsi une amélioration de la sensibilité. Des gaz d~analytes multiples sont mesurés simultanément au moyen d~un filtre de corrélation gazeuse composé d~une cellule gazeuse de référence (6 a) dans laquelle des gaz d~analytes multiples sont entièrement chargés et d~une cellule gazeuse de sonde (6 b) dans laquelle tous les autres gaz d~analytes, à l~exception des gaz d~analytes multiples ci-dessus, sont chargés.
Japan Science And Technology Agency
Marks & Clerk
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