Method and apparatus for optical measurement of...

G - Physics – 01 – N

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G01N 21/41 (2006.01) G01K 11/00 (2006.01) G01N 21/43 (2006.01)

Patent

CA 2348541

Disclosed are a method and an apparatus for precision optical measurement of solute concentration and temperature of a transparent liquid. The apparatus includes a vessel (12) which contains a sample of liquid (14), the refractive index of which is to be determined, a light source (22), and a beam position sensor (30). The vessel (12) has an entrance side and an exit side, with a known angular relationship therebetween, and is situated in a known ambient. The light source (22) is located so as to cause a beam of light to impinge on the entrance side at an angle with respect to a normal to an outer surface of the entrance side, to pass through the liquid (14), and to then pass through the exit side, from which it exits at an angle with respect to a normal to an outer surface of the exit side. The beam position sensor (30) provides data for determining the exit angle thereby permitting the refractive index of the liquid to be determined, based on the angles.

L'invention concerne un procédé et un dispositif pour mesurer avec précision par voie optique la concentration d'un soluté et la température d'un liquide transparent. Ce dispositif comprend une cuve (12) contenant un échantillon de liquide (4) dont l'indice de réfraction doit être déterminé, une source lumineuse (22) et un détecteur de position de rayonnement (30). La cuve (12) présente un côté entrée et un côté sortie, qui forment un angle l'un par rapport à l'autre, et est située dans un milieu connu. La source lumineuse (22) est placée de sorte qu'un rayon lumineux arrive sur le côté entrée en formant un angle par rapport à la normale à une surface extérieure du côté entrée, traverse le liquide (14) puis traverse le côté sortie, d'où il sort en formant un angle par rapport à la normale à une surface extérieure du côté sortie. Le détecteur de position de rayonnement (30) fournit des données servant à déterminer l'angle de sortie et permettant ainsi de déterminer l'indice de réfraction du liquide, d'après lesdits angles.

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