Method and apparatus for measuring the size of a single fine par

Details Method and apparatus for measuring the size of a single fine par Method and apparatus for measuring the size of a single fine par

1991-11-20

1993-07-20

Rosenberger, Richard A.

Optics: measuring and testing

For size of particles

By particle light scattering

356340, 356343, 356364, G01N 1502, G01N 2100

Patent

active

052298396

ABSTRACT:
The invention relates to a method and an apparatus for determining the size or the size distribution of fine particles. A single particle or a group of particles are shone by a parallel polarized beam of a single wave length and the scattered intensity on the plane of polarization of the incident beam is measured by a photodetecting array. For a single particle the size is determined from the peak scattering angle at which the profile of the product of the scattered intensity and the scattering angle has the peak. On the other hand, for a group of particles, the size distribution is determined from the angular variation of the scattered intensity or the profile of the product of the scattered intensity and the scattering angle measured on the plane of polarization of the incident beam. For fine particles mixed with large particles the scattered intensities on the plane at a right angle to the plane of polarization measured by another photodetecting array is used to improve the accuracy of size determination of the fine particles.

REFERENCES:
patent: 3612689 (1971-10-01), Liskowitz
patent: 3901602 (1975-08-01), Gravatt
Powder Metallogy Int'l, vol. 10, No. 2 May 1978 p. 98.

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