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The principle of laser dust particle counter sensor

Update: 2019-09-02 15:03 Source: LUFTMY

Laser dust particle counter is often used to detect the concentration of suspended particles in the air, so as to determine whether the dust particle concentration meets the requirements of the relevant national standards, so what is the working principle of laser dust particle counter sensor?

Dust detector
Dust detector

Dust particle detection laser sensor, the light from the light source is focused by the lens in the measurement chamber, when each particle in the air quickly through the measurement chamber, it will scatter the incident light once, forming an optical pulse signal. This optical signal is sent to the optical detector, converted into electrical pulse signal, and then through the amplification and screening of the instrument's electronic circuit, pick out the needed signal, and display it through the counting system.

Air quality sensor module
Air quality sensor module

Particles in the air scatter when they are irradiated by light. This phenomenon is called light scattering.Light scattering is related to particle size, wavelength of light wave, refractive index of particle and absorption characteristics of particle to light. However, in terms of the scattering light intensity and the size of air particles, there is a basic rule that the scattering light intensity of particles increases with the increase of the surface area of particles. Thus the size of a particle can be inferred by measuring the intensity of the scattered light. This is the basic working principle of the light-scattered particle counter.

LD11 laser PM2.5 dust sensor
LD11 laser PM2.5 dust sensor

Air quality sensor module is based on laser MIE scattering theory of particle concentration and high precision sensors, air quality detection sensor can collect continuously per unit volume and calculate the number of different particle sizes of suspended particles in the air, the particle concentration distribution, and conversion into mass concentration, and the output in the form of general digital interface, can accurately detect the clean environment in the air the number of different particle size of dust particles per unit volume, at the same time the output 0.3μm, 0.5 μm, 1.0μm , 2.5 μm,10μm the number of particles, thin design, Suitable for detector, wearable device, air purifier, fresh air system, etc.

TAGdust identification sensor Dust particle detection laser sensor laser dust particle counter sensor air quality sensor module air quality detection sensor