Continuous particulate emissions monitor calibrator

Details Continuous particulate emissions monitor calibrator Continuous particulate emissions monitor calibrator

G - Physics

01

N

G01N 21/59 (2006.01) G01F 1/66 (2006.01) G01F 1/712 (2006.01) G01F 25/00 (2006.01) G01N 15/00 (2006.01) G01N 15/06 (2006.01) G01N 21/85 (2006.01)

Patent

CA 2188414

A device (10) and method for monitoring particulate (22) flowing through a conduit (20) has a transmitter (16) and a receiver (18) positioned in optical alignment on opposite sides of the conduit (20). A light beam (50) is transmitted across conduit (20) from the transmitter (16) to the receiver (18). Particulate (22) flowing through conduit (20) interrupts light beam (50) causing a signal to be generated from which particulate concentration is determined. A calibrator assembly (40) has a motor (64) adapted to move a filter (100) having a selected percentage opacity within the path of light beam (50). Movement of the filter (100) modulates light beam (50) and a signal corresponding to the concentration associated with the percentage opacity is generated.

La présente invention concerne un dispositif (10) et une technique de contrôle des matières particulaires (22) s'écoulant par un conduit (20). Ce dispositif comprend un émetteur (16) et un récepteur (18) positionnés en alignement optique sur des côtés opposés du conduit (20). Un faisceau lumineux (50) est transmis à travers le conduit (20) de l'émetteur (16) au récepteur (18). Le flux de matières particulaires (22) dans le conduit (20) coupe le faisceau lumineux (50), déclenchant un signal à partir duquel on détermine la concentration de matières particulaires. Un ensemble de calibrage (40) est doté d'un moteur (64) conçu pour déplacer un filtre (100) ayant un certain rapport d'opacité dans la trajectoire du faisceau lumineux (50). Le mouvement du filtre (100) module le faisceau lumineux (50) et un signal est généré, correspondant à la concentration associée au rapport d'opacité.

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