Focused aperture module

Details Focused aperture module Focused aperture module

1980-11-24

1983-07-26

Tokar, Michael J.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

Particle counting

377 10, G01N 2700

Patent

active

043956769

ABSTRACT:
A particle analyzer for a sample suspension of particles originating in a container in which: a flow director is mounted between the container and a first chamber, a particle sensing aperture is mounted between the first chamber and a second chamber, a liquid sheath is introduced into the first chamber for hydrodynamically focusing the particles through the sensing aperture, an electrical current passes through the sensing aperture for generating impedance signals, the pressure drop is regulated across the flow director to assure a constant flow of the suspension through the flow director and the aperture, and the flow director is formed into an optical element for viewing the sensing aperture.

REFERENCES:
patent: 2656508 (1953-10-01), Coulter
patent: 3299354 (1967-01-01), Hogg
patent: 3549994 (1970-12-01), Rothermel
patent: 3710933 (1973-01-01), Fulwyler
patent: 3793587 (1974-02-01), Thom
patent: 4001678 (1977-01-01), Berg
patent: 4014611 (1977-03-01), Simpson et al.
patent: 4165484 (1979-08-01), Haynes

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