G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 21/01 (2006.01) G01N 21/25 (2006.01) G01N 21/31 (2006.01)
Patent
CA 2201786
According to an embodiment of the invention, the device comprises a unique optical path and a movable means providing for the selective passage of a light beam respectively through a transparent cell (4) containing a subtance to be studied, at least one reference filter (6). The light reflected successively by one and the other of said two components is selectively applied to three filters (F1-F3) which filter three wavelengthes selected as a function of the substance to be analyzed. Three detectors (D1-D3) are used to measure the successive light intensities which have gone through each of the filters, and from the measures obtained, it is possible to determine a correction coefficient before calculating a characteristic of the substance contained in the transparent cell.
Selon un mode de réalisation, le dispositif comporte un parcours optique unique et un moyen mobile permettant le passage sélectif d'un faisceau de lumière respectivement à travers une cellule transparente (4) contenant une substance à étudier, au moins un filtre de référence (6). La lumière émanant successivement de l'un et l'autre de ces deux composants est appliquée sélectivement à trois filtres (F1-F3) filtrant trois longueurs d'onde choisies en fonction de la substance à étudier. On mesure par trois détecteurs (D1 à D3) les intensités lumineuses successives ayant traversé chacun des filtres et à partir de ces mesures on détermine un coefficient de correction avant de calculer une caractéristique de la substance contenue dans la cellule transparente.
Delignieres Robert
Durand Christian
Institut Francais Du Petrole
Robic
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