Method and apparatus for monitoring the diameter of...

G - Physics – 01 – N

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G01N 15/14 (2006.01)

Patent

CA 2198159

In a method of monitoring in-flight particles, a mask in a is places in a plane generally parallel to the direction of travel of the particles. The mask defines at least two slits that are generally parallel and lie in a direction having at least a component at right angles to the direction of travel. The have their ends offset relative to each other. The radiation emitted, scattered or absorbed by the particles is monitored as they traverse the slits. The particles for which the radiation, emitted, scattered or absorbed at each slit as they sequentially traverse said slits bears a predetermined relationship are identified, and the size of the identified particles is determined from the amount of radiation emitted, scattered or absorbed as the identified particles traverse the slits.

Dans une méthode d'observation de particules en vol, un masque est placé dans un plan généralement parallèle à la direction de déplacement des particules. Ce masque définit au moins deux fentes généralement parallèles dans une direction ayant au moins une composante perpendiculaire à la direction de déplacement des particules. Les extrémités des fentes sont décalées l'une par rapport à l'autre. Le rayonnement émis, diffusé ou absorbé par les particules est observé quand celles-ci passent par les fentes. Les particules avec lesquelles le rayonnement émis, diffusé ou absorbé à chacune des fentes quand elles passent séquentiellement par ces fentes a une relation prédéterminée sont identifiées et la taille des particules identifiées est déterminée à partir de la quantité de rayonnements émis, diffusé ou absorbé quand les particules identifiées passent par les fentes.

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