Sheathed particle flow controlled by differential pressure

Details Sheathed particle flow controlled by differential pressure Sheathed particle flow controlled by differential pressure

1987-11-25

1991-08-20

Rosenberger, Richard A.

Optics: measuring and testing

With plural diverse test or art

356 73, G01N 2101

Patent

active

050408909

ABSTRACT:
A flow apparatus for the analysis of particles passing substantially one at a time through an analysis region includes a flow rate control responsive to changes in the pressure used to drive the particles through the analysis region. The flow rate control automatically regulates the flow to a preset value throughout the analysis by adjusting the particle driving pressure to be uniform even though the sheathe liquid supply is depleted during the analysis. A method for controlling the flow of a supply of particles to be analyzed includes steps of sensing differential pressure and regulating the differential pressure to a preset reference.

REFERENCES:
patent: 4070617 (1978-01-01), Kachel et al.
patent: 4285245 (1981-08-01), Kennedy
patent: 4503385 (1985-03-01), Haynes
patent: 4683212 (1987-07-01), Uffenheimer

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