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How does the PM2.5 sensor detect particulate pollutants in the air through dust concentration

Update: 2021-07-19 10:46 Source: LUFTMY Reading: ↻ News

Air particulate pollutants consist of particles, acid droplets, organic chemicals, metals, soil, or dust.Moreover, the size of air particulate pollutants is closely related to the risk of disease, and the smaller the size, the greater the harm.Particulate matter smaller than 10 microns (PM10) -- about one-eighth the diameter of a human hair -- can pass through the throat and into the lungs, causing serious health problems.


Particles are more harmful when they are smaller than 2.5 micrometers (PM2.5) in size and can travel deep into the body's lungs, where there is no natural way to avoid them.The particles are too large for the body's immune system to process, but they are small enough to penetrate deep into the body's respiratory system.Therefore, Luftmy dust sensor is currently able to accurately detect the weight of particulate matter and provide particulate matter mass concentration sensor.


Particulate matter sensors commonly used include two kinds of PM10 sensors and PM2.5 sensors. The principle of sensors is commonly used in two categories: laser principle and infrared principle.


Infrared principle: infrared light intensity is very weak, in the measurement of particle intensity is insufficient, can be replaced by turbidimetric method.The so-called turbidimetric method is to determine the current air turbidity by the fact that light is emitted on one side and received on the other. The more cloudy the air is, the more energy is lost by the light.In fact, this method is not able to accurately measure PM2.5, and even the transmitting and receiving parts of light are covered by dust adsorbed by static electricity, which will directly lead to inaccurate measurement.This method to make the sensor can only be qualitative measurement, because the value will float, can not be quantitative measurement.


Laser principle: the measurement technology based on laser scattering principle is the most widely used particle measurement technology.This is an optical method, but the principle of optical imaging is different from that of microscopy.The principle of laser scattering is to generate scattering by irradiating suspended particles in the air with laser, and collect the scattered light to a specific Angle to obtain the curve of the scattering light intensity changing with time.Then, the equivalent particle size and the number of different particle sizes per unit volume were obtained by the microprocessor using the algorithm based on Mie theory.


In recent years, the portable particle sensor based on light scattering principle has become a new type of monitoring equipment in the field of environmental air monitoring. Its emergence leads and occupies the development direction of the new generation of monitoring instruments.Luftmy provides laser PM2.5 sensor -LD15 is a general purpose fine particulate matter concentration sensor designed to obtain quality data of PM2.5 and PM10 per unit volume of air and output it in the form of digital interface.The sensor can be embedded in various fine particulate concentration-related instruments, air purifiers and other environmental improvement equipment, or used in other scenarios where PM2.5 concentration needs to be detected.

How does the PM2.5 sensor detect particulate pollutants in t


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