A Laser Particle Size Analyzer Combining Forward and Inverse Fourier Optical Paths

Abstract

The invention relates to a laser particle size analyzer combining forward and reverse Fourier optical paths, including a laser, a lens, a sample pool and a photodetector, wherein the parallel light of the laser becomes converged light after passing through the lens and enters the sample pool, and the photodetector is Multiple, respectively installed in the front, side and rear of the lens of the sample cell; the photodetector includes a forward detector and a backward detector, wherein the forward detector adopts the form of an inverse Fourier optical path, and is placed obliquely in combination with the sample cell. The backward detector is placed on the curved surface of the rear side of the lens. The invention solves the defect of the single optical path of the laser particle size analyzer, realizes the advantages and disadvantages, and combines the oblique placement of the sample pool in the forward reverse Fourier optical path, breaks through the limitation of the total reflection angle, and realizes a larger forward scattering angle reception scope.

Description

technical field [0001] The invention relates to an optical particle size analyzer, in particular to a laser particle size analyzer combined with forward and reverse Fourier optical paths. Background technique [0002] In the prior art, the laser particle size analyzer usually adopts the form of forward Fourier optical path or inverse Fourier optical path, both of which are pure in a single form. The positive Fourier optical path has the advantage of high convergence accuracy of scattered light at the same angle, but the disadvantage is that it is limited by the lens aperture and the range of receiving scattering angle is limited. The advantage of the inverse Fourier optical path is that the receiving angle of scattered light is not limited by the lens aperture, and the structure is simple. The disadvantage is that the receiving accuracy of scattered light at the same angle is poor. [0003] In addition, the scattering angle receiving range of the current laser particle size...

AI Technical Summary

Problems solved by technology

The positive Fourier optical path has the advantage of high convergence accuracy of scattered light at the same angle, but the disadvantage is that it is limited by the lens aperture and the range of receiving scattering angle is limited

The advantage of the inverse Fourier optical path is that the receiving angle of scattered light is not limited by the lens aperture, and the structure is simple. The disadvantage is that the receiving accuracy of scattered light at the same angle is poor

[0003] In addition, the scattering angle acceptance range of the current laser particle size analyzer is usually limited by the total reflection angle of the sample cell, which is usually less than 48 degrees

In the current inverse Fourier optical path laser particle size analyzer, the backward detectors are placed between the sample cell and the lens, which will reduce the effective focal length of the lens, which is not good for the upper limit of the test range.

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