Particle sizing and concentration sensor using a hollow...

G - Physics – 01 – N

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G01N 15/02 (2006.01)

Patent

CA 2436976

An optical particle detection system produces an optical beam (111) which is scattered by particles (126) in a probe volume area (115). The particles (126) may scatter the beam to the detector (135). The optical beam (111) is a hollow shaped beam which may be circular/doughnut shaped, or made be of any other hollow shape. The particle (126) passes across the beam (111), and those particles (126) which pass through the center of the beam (111) are detected as being desired particles (126) to detect. The system may be used to detect particle concentration, and size. In addition, by producing an asymmetric beam, particle direction also can be detected.

L'invention concerne un système optique de détection de particules produisant un faisceau optique diffusé par des particules dans une aire de volume d'une sonde. Les particules peuvent diffuser le faisceau vers le détecteur. Le faisceau lumineux est un faisceau de forme creuse pouvant être circulaire ou en forme de beignet ou pouvant se présenter sous n'importe quelle autre forme creuse. La particule passe à travers le faisceau et ces particules passant à travers le centre du faisceau sont détectées comme étant les particules que l'on souhaite détecter. Ce système peut être utilisé pour détecter une concentration des particules et une granulométrie. De plus, le fait de produire un faisceau asymétrique permet également de détecter la direction des particules.

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