Method and apparatus for particle counting and size measurement

Details Method and apparatus for particle counting and size measurement Method and apparatus for particle counting and size measurement

2006-01-12

2008-09-02

Nguyen, Vincent Q. (Department: 2831)

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

Particle counting

Reexamination Certificate

active

07420360

ABSTRACT:
An improved electrical sensing zone apparatus and method for counting and measuring size of particles suspended in a diluted electrolytic solution. The apparatus includes an aperture that is optimized with the use of double or single tapered shapes that approximate a hyperboloid of one sheet. The flow rate is selectably controlled to maintain a sufficiently low Reynolds number to avoid boundary layer separation effects that cause noise and consequently low sensitivity. By measuring statistical moments within the aperture, an approximation of the distribution of particle sizes is achieved.

REFERENCES:
patent: 6566853 (2003-05-01), Li et al.

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