Tech

Do you know the working principle of pm2.5 sensor?

PM2.5 sensor is also called dust sensor, dust sensor.

PM2.5 sensor is also to call dust sensor, dust sensor. It can be to use to detect the dust concentration in the air around us, that is, the value of PM2.5. Aerodynamically, the dust that can enter the alveolar area with a diameter of less than 10 μm is usually to call respirable dust. Dust particles with diameters above 10 μm are mostly to deposite by impact. Most of it is deposited in the nasopharynx during inhalation. And dust below 10μm can enter the deep part of the respiratory tract. Most of the dust deposited in the alveoli is dust below 5 μm. PM10 refers to particulate matter with aerodynamic equivalent diameter less than or equal to 10 μm in ambient air. PM2.5 fine particles are small in diameter. Suspended in the atmosphere for a long time. spread over a long distance. And usually contains a lot of toxic and harmful substances. Therefore, it has a greater impact on human health. PM2.5 can enter the lungs and blood. If it contains germs, it will cause great harm to the human body. Including to our respiratory system, cardiovascular system, and even reproductive system.

How pm2.5 sensor works

The working principle of pm2.5 dust sensor is to develope according to the principle of light scattering. Light scattering occurs when particles and molecules are to irradiate by light. At the same time, it also absorbs part of the energy of the irradiated light. When a beam of parallel monochromatic light is incident on the particle field under test. The light intensity will be to attenuate due to scattering and absorption around the particle. In this way, the relative attenuation rate of incident light passing through the concentration field to be to measure can be to obtain. The relative attenuation rate can basically linearly reflect the relative concentration of dust in the test field. The magnitude of the light intensity is proportional to the intensity of the electrical signal converted by photoelectricity. The relative attenuation rate can be to obtain by measuring the electrical signal. Then, the concentration of dust in the field to be to measure can be to determine.

The pm2.5 sensor is designed to sense dust particles in the air.

The pm2.5 sensor is designed to sense dust particles in the air.Infrared light-emitting diodes and phototransistors are placed diagonally inside. Their optical axes intersect. When the dust-laden airflow passes through the intersection area where the optical axes intersect. Dust reflects infrared light, and the reflected light intensity is proportional to the dust concentration. Phototransistors enable it to detect light reflected from dust in the air. Even very fine particles such as tobacco smoke can be to detect. Infrared light-emitting diodes emit light and meet dust to produce reflected light. The receiving sensor detects the light intensity of the reflected light and outputs a signal. The dust concentration is to judge according to the light intensity of the output signal. Different dust particle concentrations are to distinguish by outputting two different PWM signals. According to the working principle of the pm2.5 sensor, the pm2.5 sensor can generally be to use to help detect the air environment. Its main applications are mostly air purifiers, fresh air systems, portable instruments, air quality monitors, air conditioners, consumer electronics and other equipment.

 

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