Particle sensor with variable-speed blower

Details Particle sensor with variable-speed blower Particle sensor with variable-speed blower

1996-03-15

1997-02-04

Pham, Hoa Q.

Optics: measuring and testing

By particle light scattering

With photocell detection

356246, 250576, G01N 2105, G01N 2153

Patent

active

056004389

ABSTRACT:
Disclosed is a particle sensor having a light beam with a beam long axis and an air flow tube with an inlet end and a particle exit mouth. In an aspect of the invention, the cross-sectional area of the flow passage at the inlet end is greater than the cross-sectional area of the exit mouth. This enlarged area dramatically reduces pressure drop along the tube. The exit mouth is in registry with the light beam and is elongate in a direction substantially parallel to the beam long axis. Thus, particles flowing through the mouth pass through the beam. In another aspect, the invention includes a centrifugal blower which is light in weight and which may be battery powered.

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E G & G Rotron Custom Division, Woodstock, NY; "Low Voltage (4.8-12VDC) Electronically Communtated D.C. Model R203 ECDC"--#1001, Jan., 1991.

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