Nir absorbance measuring instrument with atr probe

Details Nir absorbance measuring instrument with atr probe Nir absorbance measuring instrument with atr probe

G - Physics

01

J

G01J 3/42 (2006.01) G01N 21/41 (2006.01) G01N 21/55 (2006.01)

Patent

CA 2207517

In a near infrared absorbance measurement instrument, an attenuated internal reflectance probe comprises a quartz rod having an inexpensive low purity central core surrounded by two high purity quartz layers. Narrow band infrared light is transmitted axially through the outer layer to cause the light to undergo total internal reflection from the inner and outer surfaces of the outer layer. A near infrared light detector measures the light transmitted through the outer layer to obtain a measurement of the absorbance of the fluid in contact with the outer surface of the outer layer without any interference from suspended particles or bubbles in the fluid being measured.

L'invention est un appareil de mesure de l'absorbance infrarouge qui est doté d'une sonde à réflectance interne atténuée comportant une tige de quartz à âme à faible pureté peu onéreuse entourée de deux couches de quartz de grande pureté. Un faisceau infrarouge à bande étroite est transmis axialement à travers la couche extérieure pour qu'il soit soumis à une réflexion totale par les surfaces interne et externe de la couche extérieure. Un détecteur d'infrarouge proche mesure l'intensité de la lumière infrarouge transmise à travers la couche extérieure pour mesurer l'absorbance du fluide qui est en contact avec la surface externe de la couche extérieure, sans parasitage par les particules en suspension ou les bulles qui se trouvent dans le fluide.

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