Measurement of light from a predefined scatter angle from...

G - Physics – 01 – N

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G01N 15/02 (2006.01) G01N 21/53 (2006.01) G01N 33/18 (2006.01)

Patent

CA 2647017

A measurement system that can measure scattered light across a predetermined scatter angle is disclosed. The measurement system has a light source (10) configured to provide light along a first axis. The measurement system has a lens system (3, 4) aligned along a second axis that has a first focus near the first axis and where the second axis is different than the first axis. The measurement system has a sensor (5) located on the second axis at a second focus of the lens system (3, 4) and is configured to detect scattered light near the first focus. The measurement system has a mask (9) located on the second axis and is configured to limit the light that reaches the sensor (5) to a predetermined angle of scatter. The disclosed invention eliminates the need for multiple nephelometric measuring devices and also system verification devices in order to perform assay of the presents or absence or number of suspended particles in a media as well as verification of the systems ability to measure in compliance to required performance attributes.

L'invention concerne un système de mesure qui peut mesurer la lumière diffusée à un angle de diffusion prédéterminé. Le système de mesure comporte une source lumineuse (10) configurée pour émettre une lumière le long d'un premier axe. Le système de mesure comporte également un système de lentilles (3, 4) aligné sur un deuxième axe qui comporte un premier foyer proche du premier axe, le deuxième axe étant différent du premier axe. Le système de mesure comporte aussi un capteur (5) placé sur le deuxième axe au niveau d'un deuxième foyer du système de lentilles (3, 4) et configuré pour détecter la lumière diffusée près du premier foyer, et un masque (9) placé sur le deuxième axe et configuré pour limiter la lumière qui atteint le capteur selon un angle de diffusion prédéterminé. L'invention décrite permet de supprimer les multiples dispositifs de mesure néphélométrique mais aussi les dispositifs de vérification de systèmes nécessaires pour effectuer le dosage de particules en suspension dans un milieu, en vérifier l'absence ou en déterminer le nombre, mais aussi de vérifier la capacité de systèmes à effectuer des mesures conformes à des attributs de performance requis.

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