Particle detector and particle detecting apparatus having the de

Details Particle detector and particle detecting apparatus having the de Particle detector and particle detecting apparatus having the de

1991-09-11

1992-09-22

Wieder, Kenneth A.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

Particle counting

324446, 137806, 137 13, 738655, G01N 1500, G01N 2707

Patent

active

051500370

ABSTRACT:
A particle detector is designed to detect particles such as cells and blood corpuscles, and this particle detector includes means for passing and recovering a multilayer flow consisting of an inner layer A of conductive liquid specimen, a middle layer B of conductive first sheath liquid, and an outer layer C of nonconductive second sheath liquid surrounding them, in an orifice 12, and a pair of electrodes disposed on both sides of the orifice so as to contact the conductive liquid respectively. A detector circuit 44 is connected to the pair of electrodes so as to detect a particle signal on the basis of difference of electric impedance between the electrodes. The diameter of the orifice 12 is substantially the diameter of the middle layer. By varying the flow rate balance of the conductive liquids and nonconductive liquid, the diameter of the middle layer may be freely changed. Accordingly, the diameter of the orifice may be apparently changed as desired.

REFERENCES:
patent: 3779279 (1973-12-01), Schon
patent: 4237416 (1980-12-01), Zold
patent: 4284496 (1981-08-01), Newton
patent: 4891575 (1990-01-01), Kogo

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