Device for determining the histogram of sizes of particles

Details Device for determining the histogram of sizes of particles Device for determining the histogram of sizes of particles

1980-06-24

1981-11-10

Corbin, John K.

Optics: measuring and testing

For size of particles

By particle light scattering

350162SF, G01N 1502

Patent

active

042994896

ABSTRACT:
A particle size analyzer device for granular and cellular substances composed of particles having sizes lying in a given dimensional range comprises a coherent light source for illuminating a sample of the substance and means for forming the two variable Fourier transform of the sample, i.e. its bidimensional diffraction spectrum. A monodimensional portion of the bidimensional spectrum is isolated along a radius thereof determining an amplitude function versus the radial distance from the center of the spectrum. This amplitude function is processed by successively (i) computing its Hankel transform, (ii) and deriving the second derivative of the Hankel transform. This second derivative is a convolution product of the distribution function of the particle sizes by another function. The distribution function is extracted from said convolution product.

REFERENCES:
patent: 4037965 (1977-06-01), Weiss
Anderson, N. L. and Beissner, R. E., "Counting and Classifying Small Objects by Far-Field Light Scattering", Applied Physics, Jul. 1971, vol. 10, No. 7, pp. 1503-1508.
Mohandas, Bessis and Narla, Transactions of the Academy of Sciences of Paris, Jun. 17, 1974, vol. 278, pp. 3263-3265, and Apr. 26, 1976, vol. 282, pp.1567-1570.
"Laser Granulometer, Model 227", Compagnie Industrielle des Lasers, NC 227-5, 1978.
Leeds and Northrup Co., Microtrac (TM) Particle Size Monitor for On-Stream Dry-Powder Measurement and Control.

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