Spectrophotometric analysis

G - Physics – 01 – N

Patent

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Details

G01N 21/25 (2006.01) G01J 3/42 (2006.01) G01N 21/35 (2006.01)

Patent

CA 2163993

A method of and apparatus for spectrophotometric analysis of a powder material by reflectance measurements of a near infrared beam has a sample cell (2) within which the powder (20A) is compressed between a spring biased plate (13) and a window (8) to a predetermined density. Spectrophotometric analysis is effected on the powder (20A) through the window (8) by scanning with the infrared beam over an area of the powder (20A) which when multiplied by the density of the powder and the depth of penetration of the beam is consistent with a predetermined dosage weight - such as that at which the powder may be marketed.

Un procédé et un appareil d'analyse spectrophotométrique d'un matériau en poudre, par mesure du facteur de réflexion d'un rayon proche de l'infrarouge, comporte une cellule pour échantilon (2) dans laquelle la poudre (20A) est comprimée à une certaine densité entre une plaque (13) soumise à l'action d'un ressort et une fenêtre (8). L'analyse spectrophotométrique est effectuée sur la poudre (20A), à travers la fenêtre (8) en balayant avec le rayon infrarouge, une surface de la poudre (20A) qui, lorsqu'elle est multipliée par la densité de la poudre et la profondeur de pénétration du rayon est constante avec un poids de dosage prédéterminé - tel que celui avec lequel la poudre est vendue.

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