Optical system capable of simply and conveniently detecting size and shape of particle

Abstract

The invention discloses an optical system capable of simply and conveniently detecting the size and shape of a particle. After a laser beam is subjected to optical fiber homogenization treatment, a parallel beam with good homogeneity is formed, is incident into a rotational symmetrical elliptic endoscope along a spherical endoscope system by virtue of reasonable optical path layout and converges with a sample gas flow at a focal point of the rotational symmetrical elliptic endoscope, the sample gas flow is introduced along the direction vertical to a spindle of the optical system, and a forward scattering optical signal of a particle is received by a photomultiplier and used as a main signal for measuring the size of the particle. Scattering lights, except for a forward scattering light, are incident to the other focal point of the rotational symmetrical elliptic endoscope in a large range, and a planar CCD (Charge Coupled Device) is arranged on an object mirror image plane behind the focal point and is mainly used for detecting shape information of the particle. The optical system capable of simply and conveniently detecting the size and shape of the particle is ingenious in layout, reasonable in structure and good in working efficiency.

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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