Particle sensor with low-pressure-drop air flow system

Details Particle sensor with low-pressure-drop air flow system Particle sensor with low-pressure-drop air flow system

1994-12-23

1996-05-07

Pham, Hoa Q.

Optics: measuring and testing

By particle light scattering

With photocell detection

356246, 250576, G01N 2105, G01N 2153

Patent

active

055151647

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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