Particle size and shape detection optical system capable of improving detection accuracy

Abstract

The invention discloses a particle size and shape detection optical system capable of improving the detection accuracy; after laser beams are subjected to optical fiber homogenization treatment, parallel light beams with good homogeneity can be formed, are emitted into a rotational-symmetry elliptic cavity mirror along the principal axis direction of a spherical cavity mirror system through the reasonable light path layout and are converged at a focal point of the rotational-symmetry elliptic cavity mirror together with sample air flow, the sample air flow is led in along the direction vertical to the principal axis of the system, and forward scattering light signals of particles are received by a photomultiplier so as to be taken as main signals for measuring the particle sizes. The scattered light is emitted into another focal point of the rotational symmetry elliptic cavity mirror within the large angle range except for the forward scattered light, and a surface-shaped charge coupled device (CCD) is arranged on the image plane of an objective lens behind the focal point and is mainly used for detecting the shape information of the particle sizes. The particle size and shape detection optical system is ingenious in layout, reasonable in structure and good in working effect.

Description

[0001] The present invention is a divisional application with application number: 201310307346.1, title: "Optical System for Detecting the Size and Shape of Particles Using a Rotationally Symmetric Elliptical Cavity Mirror", and filing date: 2013.7.22. technical field [0002] The invention relates to an optical sensor. Background technique [0003] Particle detection technology plays a vital role in scientific research, industrial sites, and atmospheric environment monitoring. Its detection technologies mainly include optical method, electrical method, and kinetic method. Among them, optical method is the most widely used for its wide measurement range, no contact with samples, fast, automatic and real-time. Typical instruments such as Coulter, Climet and ROYCO particle counter, domestic laser particle counter, etc. However, these instruments can only be used to measure the size of the particles, and the detection of the shape is rarely involved; not only that, but these i...

AI Technical Summary

Problems solved by technology

However, these instruments can only be used to measure the size of particles, and the detection of the shape is rarely involved; not only that, but these instruments also have the defects of limited acceptance angle range and poor light uniformity in the photosensitive area

For this reason, in the patent [CN201110346535.0], an optical sensor with a rotationally symmetrical elliptical cavity mirror is designed to measure the size and shape of particles. The uniformity of light has also been improved to some extent, but because the large-angle scattered light receiver only uses three photocells located at the vertices of the triangle, the amount of information collected is too small, which affects the detection accuracy of the shape, and also has a certain degree of difficulty in the detection of the size of the particles. Influence; In addition, the optical path layout adopted in this design to improve the beam uniformity is complex and easily affected by transportation, etc.

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