Laser particle analyzer centering and adjusting method and mechanism

Abstract

The invention provides a laser particle analyzer centering and adjusting mechanism which comprises a laser, a collimation and beam expanding system, a sample circulation system, a Fourier transform lens and a scattering detector, wherein the laser is used for emitting laser beams; the collimation and beam expanding system is used for collimating the laser beams; the sample circulation system is used for bearing test samples; a hollow through hole is formed in a position, which corresponds to the position of a focus point of the Fourier transform lens, on the scattering detector; a single-pointdetector is arranged on one side, which deviates from the Fourier transform lens, of the scattering detector; the laser beams emitted by the laser pass through the collimation and beam expanding system and become parallel beams, and the parallel beams pass through the sample circulation system and the Fourier transform lens to be focused on a plane on which the scattering detector is located; when the test sample does not exist, the position of the scattering detector is adjusted, so that the parallel beams are focused by the Fourier transform lens and then pass through the hollow through hole; and the position of the single-point detector is adjusted, so that an output signal is maximum. The light path is aligned by utilizing the hollow through hole on the scattering detector and the single-point detector, so that the whole mechanism is centered. The invention further provides a laser particle analyzer centering and adjusting method.

Description

technical field [0001] The invention relates to the technical field of instruments and meters, in particular to a centering adjustment method and mechanism of a laser particle size analyzer. Background technique [0002] Laser particle size analyzer is an instrument that analyzes particle size through particle diffraction or spatial distribution of scattered light (scattering spectrum). The laser particle size analyzer measures the particle size distribution based on the physical phenomenon that the particles can scatter the laser light. Its specific working principle is as follows: Since the laser has good monochromaticity and strong directionality, a beam of parallel laser light will irradiate to an infinite distance in an infinite space without hindrance, and it will be very fast during the propagation process. There is little divergence. [0003] When the light beam is blocked by particles, part of the light will be scattered. The propagation direction of the scattere...

AI Technical Summary

Problems solved by technology

It is characterized by fast test speed, wide test range, good repeatability and authenticity, and easy operation. However, since the laser particle size analyzer mainly measures the angle and intensity of particle scattered light, for this reason, all components in the instrument are required. The optical axis must be consistent with the main optical axis. It is a relatively cumbersome operation for the mechanical alignment of the laser particle size analyzer.

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