Draught-fan-free laser particulate matter detection device and equipment

Abstract

The invention provides a draught-fan-free laser particulate matter detection device and equipment. The draught-fan-free laser particulate matter detection device comprises a detection cavity, a laserlens group, a first reflection delustering module and a light sensitive element; the laser lens group is arranged on an entrance of the detection cavity and is used for emitting a laser beam focused in a target area in the detection cavity to the detection cavity; the first reflection delustering module is arranged on an exit of the detection cavity and is used for delustering the laser beam and reflecting the laser beam to the outer part of the detection cavity, the laser beam incidents upon the incidence direction of the first reflection delustering module, the included angle of the laser beam and the reflection direction of the first reflection delustering module is more than or equal to 90 degrees; the light sensitive element is arranged in the detection cavity and is used for measuring the light intensity of scattered light formed by enabling the laser beam to irradiate on a particulate matter. The draught-fan-free laser particulate matter detection device achieves the technical effects that: the stray light is eliminated, the reflected light is prevented from affecting the detection, the light sensitive element is guaranteed not to be affected by external air flow, and the detection accuracy of the particulate matter is improved.

Description

technical field [0001] The invention relates to the technical field of air quality detection, in particular to a detection device and equipment for fanless laser particles. Background technique [0002] Particulate matter refers to the particulate matter in the ambient air with an aerodynamic equivalent diameter less than or equal to 2.5 microns. The concentration of particulate matter directly affects the quality of ambient air. The elastic light scattering measurement method has the characteristics of fast speed and high sensitivity, and is one of the main methods to monitor the concentration of aerosol particles. Particles in the gas will scatter under the irradiation of light. There is a basic law between the intensity of scattered light and the size of particles, that is, the intensity of light scattered by particles increases with the increase of the surface area of ​​the particles. In this way, the size of the particle can be inferred only by measuring the intensity...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a fanless laser particle detection device and equipment to alleviate the technical problem of low detection accuracy of the fanless laser particle detection device in the prior art

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