Optical flow meter for measuring gases and liquids in pipelines

G - Physics – 01 – P

Patent

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Details

G01P 5/26 (2006.01)

Patent

CA 2537344

An optical system design for measuring the velocity of fluids flowing through pipes or other conduits is disclosed. The optical system is comprised of a means for delivering two beams through a window in the wall of the pipe, focused to two points aligned along an axis of the pipe and separated by a known distance, and means for detecting light that is scattered by particles carried in the fluid stream through a second window, that is disposed on the opposite side of the pipe. By measuring the time delay between detected signals, the velocity of the fluid can be determined. The delivered light beams are focused in a shallow cone of light and are blocked by an obstruction disposed behind the second window. The scattered light passes through an aperture behind the second window that surrounds the obscuration, and is focused on to a detector surface.

L'invention concerne une conception de système optique permettant de mesurer la vitesse de fluides s'écoulant des conduites ou d'autres canalisations. Le système optique est constitué de moyens permettant d'administrer deux faisceaux à travers une fenêtre dans la paroi de la conduite, focalisé sur deux points alignés sur un axe de la conduite et séparés par une distance connue, et de moyens permettant de détecter la lumière diffusée par des particules portées dans le courant de fluide à travers une deuxième fenêtre qui se trouve sur le côté opposé de la conduite. On peut déterminer la vitesse du fluide en mesurant la délais temporels entre les signaux détectés. Les faisceaux lumineux envoyés se sont focalisés dans un cône creusé de lumière et sont bloqués par un obstacle placé derrière la deuxième fenêtre. La lumière diffusée traverse une ouverture derrière la seconde fenêtre entourant l'occultation et est focalisée sur une surface de détection.

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