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Image‐Sedimentation technique for practical size analysis
Author(s) -
Ma Xinghua,
Wan Mingrui
Publication year - 1997
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.19970140602
Subject(s) - sedimentation , suspension (topology) , settling , particle size , optics , materials science , particle size distribution , intensity (physics) , beam (structure) , light intensity , point (geometry) , particle (ecology) , image sensor , image processing , image (mathematics) , physics , chemistry , computer science , mathematics , computer vision , geology , paleontology , geometry , oceanography , sediment , homotopy , pure mathematics , thermodynamics
A method called “image‐sedimentation”, based on the application of Stokes' law to suspension and image techniques, is proposed for the rapid analysis of particle size distributions. A parallel beam of optical light, after passing through a cell containing particles, is measured with a linear image sensor with 2048 photodetectors to determine the attenuated light intensity displayed on a monitor screen. The settling height between any given point and the liquid surface can be measured accurately by use of this image technique without any additional mechanical device to move either the light beam or the glass cell containing the suspension. Consequently, the total time required for the determination of the particle size distribution, typically of a carborundum powder having a median diameter of 5 μm, takes only 5 min as compared with more than 20 min by using other instruments based on the sedimentation principle.