Laser granularity measurement instrument with combination of dynamic and static light scattering

Abstract

The invention relates to a laser particle size analyzer combining dynamic and static light scattering, which has a laser, a focusing lens, a sample pool, and a measuring optical path, wherein the measuring optical path is installed on a mechanical arm, and one end of the mechanical arm is connected to the outer edge of a rotating platform. The scattered light signal of the sample is received at different angles; the light emitted by the laser is directed to the sample pool through the focusing lens; the sample pool and the rotating platform are both circular, and the sample pool is set in the center of the rotating platform and does not rotate with the rotating platform. The invention installs the measurement optical path on the mechanical arm, and then drives the mechanical arm to rotate by controlling the rotating platform to realize the reception of scattered light signals at different angles, adopts dynamic light scattering to measure the particle size at a fixed angle, and continuously collects scattered signals at various angles when rotating. Scattering Mie theory to measure particle size, for wide distribution samples, both dynamic light scattering and static light scattering are used to measure, which greatly improves the measuring range and measurement accuracy of the instrument.

Description

technical field [0001] The invention relates to a powder particle size measuring instrument, in particular to a laser particle size analyzer combining dynamic and static light scattering. Background technique [0002] Laser particle size analyzer has become the most popular powder particle size measurement instrument. Laser particle size analyzers in the prior art are mostly products based on a single dynamic light scattering principle or a single static light scattering principle. Along the direction of the optical path, the dynamic light scattering instrument usually includes: a laser, the beam of which is filtered, expanded, and collimated, and emitted as parallel light; a focusing lens, which converges the laser beam to the center of the sample cell; the sample cell, the light-transmitting surface It is glass, perpendicular to the incident light, the powder sample (suspension) is in the sample cell, the laser is irradiated on the measured particles through the glass fro...

AI Technical Summary

Problems solved by technology

[0005] Due to the limitations of the measurement principle in the prior art, the accuracy of the single dynamic light scattering or static light scattering laser particle size analyzer for wide dispersion samples, especially for samples with both nanometers and micrometers, has decreased. The problem is to provide a laser particle size analyzer that combines dynamic and static light scattering to achieve the desired range measurement by using both the principles of dynamic light scattering and static light scattering

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