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Method and apparatus for dry particle analysis

  • US 5,579,107 A
  • Filed: 05/25/1995
  • Issued: 11/26/1996
  • Est. Priority Date: 05/25/1995
  • Status: Expired due to Fees
First Claim
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1. A dry particle analyzer comprising:

  • means for drizzling particles from a bulk sample thereof, means for providing a downward flow of first sheath ambient air around said drizzling particles in a flow regime of laminar bulk flow with a surrounding viscous boundary layer, means for suddenly changing the flow regime of said drizzling particles and first sheath air to a flow regime with a surrounding second sheath of high velocity air causing high shear and acceleration of said drizzling particles and first sheath air flow and with admixture of said second sheath air, means for columnating and decelerating said particles and said admixture of first sheath air and second sheath air, means for providing a downward and columnar flow of third sheath ambient air around said columnated drizzled particles and first and second air flows admixed together and substantially in velocity union therewith, and means defining a vertically downwardly extending optical analysis cell passage receiving the unified downward flow of drizzled particles and admixed first and second sheath air surrounded by said third sheath air for columnated downward flow therein, whereby the drizzled particles flow downwardly continuously from said bulk sample and through said analysis cell passage.

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