Infrared spectrometer

G - Physics – 01 – J

Patent

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Details

G01J 3/42 (2006.01) G01J 3/08 (2006.01) G01N 21/27 (2006.01) G01N 21/35 (2006.01) G01N 21/39 (2006.01)

Patent

CA 2715157

Method and apparatus for detecting, by absorption spectroscopy, an isotopic ratio of a sample, by passing first and second laser beams of different frequencies through the sample. Two IR absorption cells are used, a first containing a reference gas of known isotopic ratio and the second containing a sample of unknown isotopic ratio. An interlacer or reflective chopper may be used so that as the laser frequencies are scanned the absorption of the sample cell and the reference cell are detected alternately. This ensures that the apparatus is continuously calibrated and rejects the baseline noise when phase sensitive detection is used.

Linvention concerne un procédé et un appareil pour détecter, par spectroscopie dabsorption, un rapport isotopique dun échantillon, en faisant passer des premier et second faisceaux laser de différentes fréquences sur léchantillon. Deux cellules dabsorption IR sont utilisées, une première contenant un gaz de référence du rapport isotopique connu et la seconde contenant un échantillon de rapport isotopique inconnu. Un entrelaceur ou hacheur réfléchissant peut être utilisé de sorte que lorsque les fréquences laser sont balayées, labsorption de la cellule échantillon et labsorption de la cellule de référence sont détectées de manière alternée, ce qui garantit que lappareil est étalonné en continu et rejette le bruit de référence lors de lutilisation dune détection sensible à la phase.

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