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The working principle of dust particle sensor is briefly introduced

Update: 2020-05-12 10:31 Source: LUFTMY Reading: ↻ News

With the popularization of smart home and the demand of improving air quality, dust particle sensor has been widely used in air purifier, vacuum cleaner, fresh air system, PM2.5 detector and other equipment. The following is a brief introduction of the working principle of dust particle sensor.

The working principle of dust particle sensor is briefly introduced
The working principle of dust particle sensor is briefly introduced


What is a dust particle sensor

Dust particle sensors, also known as dust sensors and PM2.5 sensors, can be used to detect the concentration of dust in the air around us, known as PM2.5.PM2.5 fine particles have small diameter, long suspension time in the atmosphere, long propagation distance, and usually contain a large number of toxic and harmful substances, which have a great impact on human health.PM2.5 can enter the lungs and blood.If it carries bacteria, it can do great harm to the human body, including our respiratory system, cardiovascular system, and even reproductive system.

Working principle of dust particle sensor

Based on the scattering principle of light, the working principle of dust particle sensor was developed.Particles and molecules scatter light when exposed to light.At the same time, they absorb some of the energy of the light that hits them.When a parallel beam of monochromatic light enters the field of the particle being measured, it will be affected by the scattering and absorption around the particle, and the light intensity will be weakened.In this way, the relative attenuation rate of the incident light passing through the concentration field to be measured can be obtained.The relative attenuation rate can reflect the relative concentration of dust in the area to be measured almost linearly.According to the algorithm and calibration method, the dust concentration can be obtained by counting the real-time particle number concentration.

Dust particle sensors are designed to sense dust particles in the air.For example, the structure consists of the following parts, its inner diagonal Settings have infrared light-emitting diode and the phototransistor, infrared light-emitting diodes and phototransistor optical axis intersection, when the airflow through the intersection area of the optical axis intersect with dust, dust reflected infrared light, phototransistor phototransistor can detect the reflected light, the dirt in air even can detect very small particles, such as tobacco smoke, receiving sensors detect the reflected light intensity, the reflected light intensity is proportional to the dust concentration, the output signal, according to the output signal intensity of dust concentration, through the output of different pulse width modulation signal to distinguish,Thus, PM2.5 and PM10 can be measured.

LD13 dust particle sensor
LD13 dust particle sensor

About dust particle sensor Luftmy Wallace recommend this LD16 laser type dust particle sensor, the module is based on laser MIE MIE scattering theory of particle concentration and high precision sensors, can continuous acquisition 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.The sensor can be embedded into various instruments or environmental improvement equipment related to the concentration of suspended particulate matter in the air to provide timely and accurate concentration data.

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