Particulate matter sensor working principle

The particle sensor is an advanced device widely used in the field of environmental monitoring. It can detect and measure tiny particles in the air, providing us with important air quality information. This article will delve into the Particulate matter sensor working principle to help readers better understand the basic principles of this technology.

Particulate matter sensor working principle

Particulate matter sensor working principle is based on the interaction of optics and electricity. The sensor captures tiny particles in the air through a sophisticated optical system and then conducts precise measurements electrically. The following are the main working principles of particulate matter sensors:

Laser Dust Sensor FS00201

Particulate matter sensor working principle

Optical Scattering Principle: Particle sensors use the optical scattering principle to detect particles in the air. The sensor contains a light source that emits a beam of light and a receiver that measures the intensity of the beam after it is scattered by particles. The size and concentration of particles affect the scattering of light, so the intensity of scattered light can be measured to infer the concentration and size of particles.


Electrical measurement principle: On the basis of optical measurement, electrical measurement is used to further improve the accuracy of the sensor. By directing the scattered light beam into electronic components, the sensor converts the optical signal into an electrical signal. These electrical signals change as the concentration of particulate matter changes, and the sensor quantitatively assesses the concentration of particulate matter in the air by measuring changes in the electrical signal.


Data processing and output: The electrical signals collected by the sensor are processed by the built-in microprocessor. The microprocessor uses a preset algorithm to convert the measured data into actual particle concentration values. These data are finally presented to the user through the sensor’s output interface, such as a digital display or wireless communication module.


Calibration and Compensation: To ensure sensor accuracy, calibration and compensation are often required. The calibration process ensures the accuracy of the measurement results by calibrating the sensor at zero point and full scale. Compensation is used to eliminate the effects of external factors on sensor performance, such as humidity and temperature changes.

FS00203 (3)
Laser Dust Sensor FS00203

In general, particle sensors achieve efficient detection of tiny particles in the air through the synergy of optics and electricity. This technology can not only be widely used in indoor and outdoor air quality monitoring, but also provides important data support for environmental pollution control and public health management. By in-depth understanding of the working principle of particulate matter sensors, we can better grasp the key technologies of air quality monitoring and provide strong support for creating a cleaner and healthier environment.