Procedure for determining the size and size distribution of part

Details Procedure for determining the size and size distribution of part Procedure for determining the size and size distribution of part

1991-01-14

1992-10-20

Williams, Hezron E.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G01C 2500

Patent

active

051560399

ABSTRACT:
A procedure for determining particle size and particle size distribution data from sedimentation field-flow fractionation comprises carrying out a calibration run in which a sample of particles of known density and size is injected into a liquid carrier stream flowing through a field-flow fractionation channel. The acceleration G acting on the calibration sample during the calibration run and the density difference .DELTA..rho. between the particles of the calibration sample and the liquid carrier of the calibration run are known. Retention time or retention volume of the particles of different known sizes are measured during the calibration run. The retention times or retention volumes are used to develop a calibration relationship expressing retention time or retention volume as a function of particle size. In a test run, a test sample of particles is injected into the liquid carrier stream flowing through the channel. The density difference .DELTA..rho.' between the test particles and the liquid carrier stream is known, but the test particles have sizes and a size distribution that are unknown. The acceleration G' acting on the test sample is adjusted so that the product G'.DELTA..rho.' for the test run is the same as the product G.DELTA..rho. for the calibration run. The relative concentration of test particles eluted at different times in the test run is determined, and this relative concentration determination is combined with the calibration relationship to calculate the particle sizes and the particle size distribution of the particles in the test sample.

REFERENCES:
patent: 2693706 (1954-11-01), Carpenter et al.
patent: 4193288 (1980-03-01), Berber et al.
patent: 4283276 (1981-08-01), Grant
patent: 4285809 (1981-08-01), Dilks, Jr. et al.
patent: 4331862 (1982-05-01), Ryan
patent: 4434647 (1984-03-01), Whitcomb et al.

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