Particle size analyzer

Details Particle size analyzer Particle size analyzer

1978-05-15

1979-12-18

Corbin, John K.

Optics: measuring and testing

For size of particles

By particle light scattering

250574, 356 285, G01N 2126

Patent

active

041792181

ABSTRACT:
A particle size analyzer that measures the intensity of light scattered by moving particles passing through the probe of a crossed beam laser anemometer, verifies that the measured signal was produced by a particle passing through a region near the center of the probe, and stores count values related to the number of particles producing the same scattered light intensity value is disclosed. Since scattered light intensity values are related to particle size, the stored count values equal the number of particles of the same size detected by the analyzer. In the preferred form of the invention, the measured light intensity determines the address of a particular intensity bin of a storage system. After verification to determine if a measured intensity value was produced by a particle passing through a region near the center of the probe, the count value stored in an intensity bin related to the measured value is updated by one. When any bin reaches the maximum value that can be stored therein, the particle light intensity measuring mode of operation ends and the particle size analyzer is placed in a readout mode of operation. In the readout mode of operation, the intensity bin count values are sequentially read out, converted into analog form, and displayed.

REFERENCES:
patent: 3680961 (1972-08-01), Rudd
patent: 3830568 (1974-08-01), Allen
Applied Optics, vol. 12, No. 6, Jun. 1973, pp. 1145-1156, Brayton et al, "Two-Component Dual Scatter Laser Doppler Velocimeter with Frequency Burst Signal Readout".

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