Apparatus for counting and classifying particles

Details Apparatus for counting and classifying particles Apparatus for counting and classifying particles

1980-05-30

1982-08-10

Corbin, John K.

Optics: measuring and testing

For size of particles

250222PC, 356440, G01N 1502, G01N 2101

Patent

active

043435513

ABSTRACT:
An apparatus for hydrodynamically focusing particles to permit counting and classification of the particles, which apparatus includes a flow nozzle terminating in a capillary nozzle that forms a thin stream containing the particles and having a circular cross section with the particles oriented along one axis of the thin stream, and a jacket pipe enclosing the capillary nozzle for providing an entraining stream for the thin stream of particles leaving the capillary nozzle, is further provided with a further flow nozzle located downstream of the capillary nozzle and presenting a circular cross section for receiving the stream leaving the capillary nozzle, and changing its cross section from circular to rectangular such that the stream exits from the further nozzle with a rectangular cross section, a device directing a laser beam normally to one flat side of the rectangular cross section at a location downstream of the further nozzle, and a radiation detector disposed for detecting radiation resulting from impingement of laser radiation on particles in the stream of rectangular cross section.

REFERENCES:
patent: 2535181 (1950-12-01), Way
patent: 2909960 (1959-10-01), Orr, Jr. et al.
patent: 3702403 (1972-11-01), Kishi
patent: 4110043 (1978-08-01), Eisert

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