PM2.5 sensors, also called dust sensors and dust sensors, can be used to detect the concentration of dust in the air around us, i.e. the size of the PM2.5 value. Aerodynamics refers to dust with a diameter of less than 10μm that can enter the alveolar region as usually also called respirable dust. Most of the dust particles above 10μm in diameter are deposited through impact, mostly in the nasopharynx when inhaled by humans, while dust below 10μm can enter the deeper part of the respiratory tract. In contrast, most of the dust deposited in the alveoli is dust below5μm.
PM2.5 fine particles are small in diameter, suspended in the atmosphere for a long time, spread far away, and usually contain a large number of toxic and harmful substances, and therefore have a greater impact on human health, PM2.5 can enter the lungs, blood, if with germs will have a great danger to the human body, including to our respiratory system, cardiovascular system, and even reproductive system. work of PM2.5 dust sensor The principle is developed based on the light scattering principle, where particles and molecules produce light scattering phenomenon under the light irradiation, and at the same time, absorb part of the energy of the irradiated light.
When a parallel monochromatic light is incident on the particle field to be measured, the light intensity will be attenuated by scattering and absorption around the particles. In this way, the relative attenuation rate of the incident light through the concentration field to be measured can be obtained. The magnitude of the relative attenuation rate is basically a linear response to the relative concentration of dust in the field to be measured. The magnitude of the light intensity is proportional to the strength of the electrical signal converted by the photoelectricity, and the relative attenuation rate can be obtained by measuring the electrical signal, and then the concentration of dust in the field to be measured can be determined.
