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Laser dust particle counter sensor working principle

Update: 2019-12-10 15:24 Source: LUFTMY Reading: ↻ News
 

The detailed working principle of the dust particle counter sensor: the light from the light source is focused into the measuring cavity by the lens. When every particle in the air passes through the measuring cavity quickly, the incident light is scattered once to form the light pulse signal. The optical signal is sent to the photodetector, converted into electric pulse signal, then amplified and shielded by the electronic equipment of the instrument to obtain the required signal and display it through the counting system.

Laser dust particle counter sensor working principle
Laser dust particle counter sensor working principle

Particles in the air are scattered by light. This phenomenon is called light scattering. Light scattering is related to particle size, light wavelength, refractive index of particles and absorption characteristics of particles.However, in terms of the intensity of the scattered light and the size of the air particles, there is a basic rule: the intensity of the scattered light of the particles increases with the increase of the surface area of the particles.Therefore, as long as the intensity of scattered light is measured, the size of particles can be inferred, which is the basic working principle of light scattering particle counter.

In fact, each particle produces a weaker intensity of scattered light. This is a very small optical pulse, which needs to be amplified by a photoelectric converter, converted into an electrical pulse with a large signal amplitude, and then passed through an electronic circuit. Further amplifying and screening can complete the counting of a large number of electric pulses. At this time, the number of electric pulses corresponds to the number of particles, and the amplitude of electric pulses corresponds to the size of particles.

Understanding the working principle of laser dust particle counter can better test the data in the use process, and ensure the accuracy and stability of the data.

PM2.5 monitor
PM2.5 monitor

PM2.5 detector is a special instrument for measuring PM2.5 (particulate matter that can enter the lungs) in the air. It is applicable to the determination of public environment, atmospheric environment, indoor air and interior air, and can also be used for the evaluation and analysis of air purifier purification efficiency. Air particle counter is based on Mie scattering principle of spherical particles, and POS particle swarm optimization algorithm is used to invert particle mass concentration, so the data can be read quickly and accurately.

LD11 Laser PM2.5 dust sensor
LD11 Laser PM2.5 dust sensor

Particle sensor manufacturer LUFTMY——Laser digital PM2.5 sensor LD11 is a high-precision particle concentration sensor based on laser Mie scattering theory. It can continuously collect and calculate the number of suspended particles with different particle sizes in the air per unit volume, i.e. particle concentration distribution, and then convert it into mass concentration, and output it in the form of general digital interface.Particle counter LD11 has the characteristics of small volume, high precision, strong anti-interference ability, low power consumption, long life, short response time of zero error alarm rate, etc. the air particle counter can be embedded with various instruments or environmental improvement equipment related to the concentration of suspended particles in the air, such as indoor air quality detector, PM2.5 detector, etc., to provide timely and accurate concentration data.

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