Electricity: measuring and testing – Determining nonelectric properties by measuring electric... – Particle counting
Reexamination Certificate
2008-09-02
2008-09-02
Nguyen, Vincent Q. (Department: 2831)
Electricity: measuring and testing
Determining nonelectric properties by measuring electric...
Particle counting
Reexamination Certificate
active
11329829
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.
He Amy
Nguyen Vincent Q.
Sanchelima & Assoc. P.A.
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