Particulate sensor

Headlight control

Air Quality PM2,5

The concentration of the particulate matters can be measured using laser scattering, with a near-infrared LED or Laser diode, while collecting the scattered light at a specific angle with a Silicon Photodiode. After the microprocessor data collection, the relationship between the time domain and frequency domain by Fourier transform is calculated, and then through a series of complex algorithms the number of particles in the equivalent particulate matter size and volume can be found out.

Particle pollution in the air (named as "particulate matter") is a mixture of very tiny solid and liquid particles and droplets. Particles appear in a wide range of matter sizes. The size of particles is directly linked to their potential for causing health problems. Small particles less than 10 micrometers in diameter pose the greatest problems, because they can affect the lungs and heart and cause serious health problems. Larger particles are of less concern, although they can irritate the eyes, nose, and throat.

Particulate matter less than 2.5 micrometers in diameter are called "fine" particles (PM2.5). They may consist of hundreds of different chemicals. Sources of fine particles include all types of combustion, motor vehicles, power plants, residential wood burning, forest fires, agricultural burning, and some industrial processes. Wind can carry fine particles hundreds of miles from its source. PM2.5 contains more toxic heavy metals and hazardous organic pollutants and can go directly to the lungs. It is more easily attached to bacteria and viruses in the environment, so the particles have greater impact on ecology and human health.

The particulate matter sensors can be embedded in a variety of measuring instruments to provide timely and accurate concentration data of particle pollution in the air.

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