Method of and an apparatus for determining particle size distrib

Details Method of and an apparatus for determining particle size distrib Method of and an apparatus for determining particle size distrib

1992-06-05

1994-05-03

Rosenberger, Richard A.

Optics: measuring and testing

For size of particles

356442, G01N 1502

Patent

active

053092163

ABSTRACT:
A method of determining particle size distributions in the range of from about 0.03 to 10 .mu.m by measuring the spectral light extinction during sedimentation of particles suspended in a transparent liquid in a centrifugal field. The light transmissions through the suspension of light of different wavelengths are measured in response to the settling time and the particle size distribution is determined from the light transmissions measured. No knowledge of the optical data of the particles is needed. The integral equation to be solved for that purpose is given. A wide particle size range can be covered precisely within short times of analysis.

REFERENCES:
patent: 4055076 (1977-10-01), Tropea
patent: 4279512 (1981-07-01), Tunstall
patent: 4609991 (1986-09-01), Minton et al.
Dobbins et al., "Particle Size Measurements Based on Use of Mean Scattering Cross Section", Journal of the Optical Society of America, vol. 56, No. 10, (Oct. 1966), pp. 1351-1354.
Weichert, "Determination of Extinction Efficiency and Particle Size Distribution by Photosedimentation using Light of Different Wavelengths", Preprints of Papers to be Presented at the Fourth Particle Size Analysis Conference, Loughborough University of Technology, England, 21-24, pp. 28-35 (1981).
Svarovsky et al., "A New Amalogue Data Analyser for Particle Size Distribution Measurements in a Disc Centrifuge", Journal of Physics E, vol. 9, No. 11, pp. 959-962 (1976).
Groves et al., "Development Studies of a Centrifugal Photosedimentometer Using Laser Light", Powder Technology, vol. 11, No. 3, pp. 245-255 (1957).

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