CN-224216507-U - Dust particle counter

Abstract

The utility model belongs to the technical field of metering detection, and provides a dust particle counter which comprises a laser light source, a detection cavity, a detection unit and a light absorption assembly, wherein the laser light source is coaxial with the light absorption assembly, an axisymmetric plano-concave reflecting mirror group taking an optical axis as a symmetry axis is arranged in the detection cavity, and the detection unit is arranged on two sides of the axisymmetric plano-concave reflecting mirror group. The utility model can effectively improve the peak illumination in the detection cavity by utilizing the converging characteristic of the axisymmetric plano-concave reflecting mirror group to light, so that the light signal intensity scattered by dust particles is enhanced, thereby greatly improving the light signal collecting efficiency, ensuring that a detection unit can capture clearer and more accurate light signals and providing powerful guarantee for accurately measuring the quantity and the particle size of the dust particles. Meanwhile, the axisymmetric plano-concave reflecting mirror group is simple in structure, and compared with a complex optical system, the axisymmetric plano-concave reflecting mirror group is low in installation and debugging difficulty, and manufacturing and maintenance cost is reduced.

Inventors

• Yan Qingpeng
• Du Mengna
• Fan Haiyue
• ZHAO WEIHONG
• YANG WENFA
• DU ZHENXING

Assignees

• 麦克微尔(天津)科技有限公司

Dates

Publication Date

20260508

Application Date

20250509

Claims (10)

1. 1. A dust particle counter, comprising: the device comprises a laser light source, a detection cavity, a detection unit and a light absorption assembly; The laser light source is coaxial with the light absorption component, an axisymmetric plano-concave reflecting mirror group taking an optical axis as a symmetry axis is arranged in the detection cavity, and the detection units are arranged on two sides of the axisymmetric plano-concave reflecting mirror group.
2. 2. The dust particle counter of claim 1, further comprising a signal processing system, wherein the detection unit is coupled to the signal processing system.
3. 3. The dust particle counter of claim 1, wherein the detection unit comprises two photodetectors; The two photoelectric detectors are axisymmetrically arranged on two sides of the axisymmetric plano-concave reflecting mirror group.
4. 4. A dust particle counter according to claim 3, further comprising a differential amplifying circuit and a signal processing system, the two photodetectors being connected to the signal processing system by the differential amplifying circuit.
5. 5. A dust particle counter according to claim 1, wherein the light absorbing assembly is a graded index light trap device.
6. 6. The dust particle counter of claim 1, further comprising an air inlet and an air outlet.
7. 7. A dust particle counter according to claim 6, wherein a filter is provided at the air outlet.
8. 8. The dust particle counter of claim 1, wherein a temperature control system is disposed within the laser light source.
9. 9. A dust particle counter according to claim 1, wherein the mode of operation of the laser light source is a pulsed drive mode.
10. 10. The dust particle counter of claim 1, wherein the laser light source is a near ultraviolet semiconductor laser tube.

Description

Dust particle counter Technical Field The utility model belongs to the technical field of metering detection, and particularly relates to a dust particle counter. Background The working principle of the dust particle counter is mainly based on the light scattering principle, and relates to optical and electronic technologies such as an optical system, a laser technology, photoelectric conversion and the like. The dust particle counter emits light through the light source, when dust particles pass through the measuring cavity, the light is scattered, the light signal is converted into an electric signal through the light detector, and the electric signal is amplified, screened and counted through the electronic circuit, so that relevant data of the dust particles are finally obtained. At present, dust particles attenuate along with the performance of a light source in the using process, so that the light intensity changes, the accurate detection of particle scattered light signals is affected, the measurement precision is reduced, and the integration level and the precision of an optical system and a photoelectric conversion system are insufficient. Disclosure of utility model In view of the above, the present utility model provides a dust particle counter, which aims to solve the problem of lower detection precision in the prior art. A first aspect of the present utility model provides a dust particle counter comprising: the device comprises a laser light source, a detection cavity, a detection unit and a light absorption assembly; The laser light source is coaxial with the light absorption component, an axisymmetric plano-concave reflecting mirror group taking the optical axis as a symmetry axis is arranged in the detection cavity, and the detection units are arranged on two sides of the axisymmetric plano-concave reflecting mirror group. In a possible implementation, the dust particle counter further comprises a signal processing system, and the detection unit is connected to the signal processing system. In one possible implementation, the detection unit comprises two photodetectors; the two photodetectors are axisymmetrically arranged on two sides of the axisymmetric plano-concave reflecting mirror group. In one possible implementation, the dust particle counter further comprises a differential amplifying circuit and a signal processing system, and the two photodetectors are connected with the signal processing system through the differential amplifying circuit. In one possible implementation, the light absorbing component is a graded index light trap device. In one possible implementation, the dust particle counter further comprises an air inlet and an air outlet. In one possible implementation, a filter is provided at the air outlet. In one possible implementation, a temperature control system is provided within the laser light source. In one possible implementation, the mode of operation of the laser light source is a pulsed drive mode. In one possible implementation, the laser source is a near ultraviolet semiconductor laser tube. The dust particle counter provided by the embodiment of the utility model comprises a laser light source, a detection cavity, a detection unit and a light absorption assembly, wherein the laser light source is coaxial with the light absorption assembly, an axisymmetric plano-concave reflecting mirror group taking an optical axis as a symmetry axis is arranged in the detection cavity, and the detection unit is arranged on two sides of the axisymmetric plano-concave reflecting mirror group. The utility model can effectively improve the peak illumination in the detection cavity by utilizing the converging characteristic of the axisymmetric plano-concave reflecting mirror group to light, so that the light signal intensity scattered by dust particles is enhanced, thereby greatly improving the light signal collecting efficiency, ensuring that a detection unit can capture clearer and more accurate light signals and providing powerful guarantee for accurately measuring the quantity and the particle size of the dust particles. Meanwhile, the axisymmetric plano-concave reflecting mirror group is simple in structure, and compared with a complex optical system, the axisymmetric plano-concave reflecting mirror group is low in installation and debugging difficulty, reduces manufacturing and maintenance costs, is more stable in light path construction, can effectively reduce the influence of external interference on a light path, avoids detection errors caused by light path deviation or shaking, and further improves the accuracy and reliability of overall detection of the dust particle counter. Drawings In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description