Optics: measuring and testing – For size of particles – By particle light scattering
Patent
1988-04-22
1990-03-06
Willis, Davis L.
Optics: measuring and testing
For size of particles
By particle light scattering
356246, 356339, G01N 1502
Patent
active
049060945
ABSTRACT:
A fine particle measuring method of this invertion is characterized in that the laser beams for forming the scattered lights comprises the following features. That is, the method comprises a first step of splitting laser beam having an intensity increasing gradually inward from its peripheral portion and the portion inner of and near to the peripheral portion into at least two parallel beams which have respective given intensity distributions, deviating from each other orthogonally to the flow direction of the laser beams in a range in which the beam spots thereof overlap each other in the flow direction, and deviating from each other by a given distance in the flow direction a second step of detecting at least two scattered light formed continuously by one of fine particles passing subsequently the parallel laser beams of the scattered lights formed by the fine particles passing the parallel laser beams; a third step of selecting an area of a scattering region to be detected; and a fourth step of computing the particle diameters of the fine particles.
REFERENCES:
patent: 4140395 (1979-02-01), Kreikebaum
patent: 4276475 (1981-06-01), Nelson
patent: 4355897 (1982-10-01), Kaye
patent: 4547075 (1985-10-01), Fei
patent: 4636075 (1987-01-01), Knollenberg
patent: 4781459 (1988-11-01), Suzuki
Koren Matthew W.
Sumitomo Chemical Co,. Ltd.
Willis Davis L.
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