Flow apertured intracavity laser particle detector

Details Flow apertured intracavity laser particle detector Flow apertured intracavity laser particle detector

1998-09-24

2000-08-29

Font, Frank G.

Optics: measuring and testing

By particle light scattering

250574, G01N 2100, G01N 1506

Patent

active

061116424

ABSTRACT:
A particle counter (10) passes a sample stream of a carrier gas or fluid containing particles (72) through an elongated, flattened nozzle (16) and into a view volume (18) formed by an intersection of the sample stream and a laser beam (13). Particles entrained in the sample stream scatter light rays while passing through the view volume. The scattered light is collected by an optical system (26) and focused on to a detector (40). The magnitude of signal coming from the detector is indicative of the particle size. To correct for variances in particle velocity and light beam intensity across the view volume, flow aperturing is used. Flow aperture modeling (Eqs. 1-7) provides a format for designing the nozzle such that the lateral velocity profile matches the laser beam lateral intensity profile, thereby providing uniform detection sensitivity to laser light scattered from monodisperse particles distributed laterally across the view volume. Uniform detection sensitivity of monodisperse particles provides accurate particle sizing resolution.

REFERENCES:
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patent: 5565984 (1996-10-01), Girvin
patent: 5642193 (1997-06-01), Girvin et al.
patent: 5671046 (1997-09-01), Knowlton
patent: 5726753 (1998-03-01), Sandberg
patent: 5796480 (1998-08-01), Igushi
"Light Scattering Automatic Particle Counter", Japanese Industrial Standard, JIS B 9921, 1997.

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