Optical sensor capable of detecting granularity and shape feature of particles in real time

An optical sensor and real-time detection technology, which is applied in the field of optical sensors, can solve the problems of low instrument repeatability, shape detection, and limited precision, and achieve the effects of reducing residue and pollution, reducing stray light generation, and increasing uniformity

Inactive Publication Date: 2013-04-24
NANTONG UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned existing instruments only check the size of the particle, but cannot detect the shape. In addition, due to certain limitations in the range of acceptance angles, the accuracy is limited, especially the repeatability of the instrument is not high.

Method used

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  • Optical sensor capable of detecting granularity and shape feature of particles in real time
  • Optical sensor capable of detecting granularity and shape feature of particles in real time

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Embodiment Construction

[0013] see figure 1 , due to the small size of the semiconductor laser 1, it can be fixed on the outer frame of the rotationally symmetrical elliptical cavity mirror 10, the light beam emitted by it is incident on the lens 3 after passing through the reflector 2, and forms a beam expansion, and the aperture 4 plays the role of eliminating impurities. The lens 5 makes the incident light into a parallel beam, the aperture 6 reduces the cross-sectional area of ​​the beam, and makes the intensity uniform everywhere on the beam cross-section, and the reflector 7 makes the beam accurately enter the photosensitive area along the direction of a small angle with the long axis of the elliptical cavity mirror, The beam cross-section has the same dimension as the gas inlet and outlet channels, with a diameter of 2 mm. The aperture 8 prevents stray light from entering the cavity. The entire beam generating and incident system is compact in structure. The incident light beam and the sample...

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Abstract

The invention discloses an optical sensor capable of detecting the granularity and the shape feature of particles in real time. The optical sensor comprises a laser, a beam expanding collimation system, a light diaphragm, a light trap, a gas inlet and outlet passage, a pure gas sample diluting passage, a rotary symmetrical elliptical cavity mirror, a lens, a photomultiplier tube and a combined photoelectric tube detector, wherein a laser beam can be emitted into the elliptical cavity mirror in a way forming a small angle with a symmetric shaft of the rotary symmetrical elliptical cavity mirror, the laser beam and sample gas flows are converged at a focal point of the elliptical cavity mirror, the sample gas flows are guided in a direction vertical to the symmetrical shaft, scattered lightin a large-space angle range is emitted at the other focus point of the elliptical cavity mirror, and the combined photoelectric tube detector is placed on an objective lens plane behind the focus point for detecting the granularity and the shape information. The optical sensor has the advantages that the structure is reasonable, and the work effect is good.

Description

technical field [0001] The invention relates to an optical sensor. Background technique [0002] Particle detection technology is widely used in industrial and mining enterprises, atmospheric environment, medicine and scientific research fields. Its detection technologies mainly include optical method, electrical method, and kinetic method. Among them, optical method is the most widely used because of its wide measurement range, no contact with samples, fast, automatic and real-time. The optical method also includes line scanning and field scanning technology. The detection limit of line scanning technology can reach submicron level, which is suitable for low concentration and thin environment. Typical instruments are Coulter instrument. The field scanning technology is mostly suitable for environments with larger particles and higher concentrations, typical instruments such as Malvern instruments. These instruments are used to measure the size of particles, but the detect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/02G01B11/24
Inventor 戴兵袁银男戴未然
Owner NANTONG UNIVERSITY
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