Field focused particle sensing zone

Details Field focused particle sensing zone Field focused particle sensing zone

1981-06-29

1983-12-13

Tokar, Michael J.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

Particle counting

324 711, 324 713, 377 11, G01N 2700

Patent

active

044207204

ABSTRACT:
A particle analyzer wherein a flow of liquid suspension, having individually entrained particles, flows along a predetermined path; a center pair of electrodes are positioned on opposed sides of the predetermined path: the center electrodes are energized to provide an electrical sensing field therebetween, two pairs of outer electrodes are positioned so that one pair is on each side of the center electrodes; the outer electrodes are oriented and/or energized so that their electrical fields bulge outward in the direction of the sensing field of the center plates to narrow the width of the sensing field along the predetermined path. Additionally, the field between the center plates can be focused in additional directions and the sensing electrode arrangement can be implemented in a flow cell, with or without an aperture, or on the surface of a substrate.

REFERENCES:
patent: 2649573 (1953-08-01), Goldberg
patent: 2667159 (1954-01-01), Goldberg
patent: 2683986 (1954-07-01), Bartlett
patent: 3560847 (1971-02-01), Boyd
patent: 3853750 (1974-12-01), Volsg
patent: 3863159 (1975-01-01), Coulter
patent: 4298836 (1981-11-01), Groves

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