Multisensor particle counter utilizing a single energy source

Details Multisensor particle counter utilizing a single energy source Multisensor particle counter utilizing a single energy source

1989-08-03

1991-04-30

Rosenberger, Richard A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356338, G01N 2100

Patent

active

050112864

ABSTRACT:
An apparatus and method for particle detection which includes a plurality of sample regions. A sensor body has internal walls which define spaced apart sample regions, with each sample region having an inlet port and an exhaust port. An aggregate sample flow is divided into partial flows which are directed from the inlet port to the exhaust port of an associated sample region. A light source, typically a laser, is positioned to project an incident beam along a light path which intersects each of the partial sample flows through the sample regions. Particles contained within the partial sample flows scatter light as the particles pass through the incident beam. The light from a sample region is directed to a photodetector which provides a signal corresponding to the sensed light. Particle detection in each sample region is operationally independent of the others, but the information is combined to provide a total particle count of the aggregate sample flow. Alternatively, the apparatus may be utilized to provide simultaneous particle detection of separate sources of particle-bearing gas. For example, adjacent clean room areas may be monitored channelling separate sample flows directly into separate inlet ports of adjacent sample regions.

REFERENCES:
patent: 3798465 (1989-01-01), Knollenberg
patent: 4134679 (1979-01-01), Wertheimer
patent: 4387993 (1983-06-01), Adrian
patent: 4448500 (1985-10-01), Wyatt et al.
patent: 4639137 (1987-01-01), Hagan et al.
patent: 4726681 (1988-02-01), Webb
patent: 4728190 (1988-03-01), Knollenberg
Fukushima, N., et al., "A New Particle Counter (UPC) and its Performance," 9th ICCCS Proceedings 1988, Osaka, Japan, p. 220.

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