Patent
Apparatus and method for regulating sheath fluid flow in a hydrodynamically focused fluid flow system
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In this article, an apparatus for analyzing particles, adapted to operate continuously even in the absence of particles contained in a sample medium, includes a sensing region and a particle analyzer associated therewith.Abstract:
An apparatus for analyzing particles, adapted to operate continuously even in the absence of particles contained in a sample medium, includes a sensing region and a particle analyzer associated therewith. A fluid flow path, preferably air flow, causes a sample medium with particles therein to flow through the sensing region. Another fluid flow path ensheathes the sample medium with a flowing sheath fluid for hydrodynamically focusing the particles as they pass through the sensing region. The sheath fluid is adapted to flow at a first flow rate compatible with the flow rate of flowing particles. When the apparatus is operating in the absence of a sample medium, the sheath fluid is controlled to flow at a second flow rate, slower than the first flow rate, for collection thereof.read more
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References
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Patent
Device for controlling the particle flow in an apparatus for measuring the properties of particles suspended in liquid
Volker Kachel,Ewald Glossner +1 more
TL;DR: An apparatus for investigating the properties of particles held in liquid spension using the Coulter process is described in this article, wherein the flowrate of the particle suspension into the particle-free electrolyte carrier depends on the pressure difference between these two liquids.
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Particle density measuring system
John L. Haynes,Bernard A Shoor +1 more
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Particle counting apparatus utilizing various fluid resistors to maintain proper pressure differentials
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TL;DR: In this paper, an aperture type transducer is used for counting platelets and red blood cells in a whole blood sample, and alarm techniques are provided for indicating defects in the counting procedure due to excessive noise or red cell fragments, small microcytic red cells, and giant (macro) platelets.