Method and device for determining particle size categories of pa

Details Method and device for determining particle size categories of pa Method and device for determining particle size categories of pa

1974-03-05

1976-09-21

Lieberman, Eli

Radiant energy

Coded record and readers; invisible radiant energy type

250273, 356102, G01N 2320

Patent

active

039821269

ABSTRACT:
In order to determine the size category or categories of particles dispersed in a liquid a sample flow is passed through a flow channel of sufficient length to allow, at a certain point, a stable flow with a predetermined flow velocity distribution over the channel cross section, such velocity distribution also causing a distribution of the particles over the channel cross section according to the particle size, whereupon a measure of the size category is obtained by determining the amounts of particles appearing in different areas of the channel cross section. The method for determining the particle amount in a certain area of the cross section comprises use of an X-ray spectrometer, whereby the size category may be determined for different materials selectively, and at a second point of the channel there may be caused a strong turbulence to assure a uniform distribution of the particles, whereby at this second point there is obtained a corresponding normalizing measure for the equalization of the effects e.g. of density variations in the liquid.

REFERENCES:
patent: 3519353 (1970-07-01), Franz et al.
patent: 3529151 (1970-09-01), Carr-Brion
patent: 3621243 (1971-11-01), Olivier et al.
patent: 3666943 (1972-05-01), Carr-Brion et al.
patent: 3739180 (1973-06-01), Carlson
patent: 3749910 (1973-07-01), Carr-Brion et al.
patent: 3822095 (1974-07-01), Hirschfeld

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