PM Sensor

PM sensor (particulate matter sensor) and dust sensor are key devices for monitoring suspended particulate matter (e.g. PM1.0, PM2.5, PM10) in the air, which are widely used in environmental monitoring, indoor air quality control, industrial safety, and smart home applications. SUCH brings together a wide range of particulate matter detection sensors, including laser and infrared types, to meet a variety of needs, from high-precision air quality monitoring to portable measurements for home use.

PM Sensor / Dust Sensor Working Principle

Infrared PM sensor:

Infrared PM sensors are designed based on the principle of light scattering. Light scattering occurs when infrared light hits particulate matter. The sensor detects the signal change of the scattered light and calculates the concentration of the particulate matter based on the intensity of the electrical signal. The electrical signal is proportional to the intensity of the detected light. The electrical signal is amplified by an amplifier, and then a microcontroller performs a series of calculations and calibrations to finally output the particle concentration value.

Laser PM sensor:

The laser particulate matter sensor contains a laser light source and a photodetector, which collects the intensity of the scattered light in real time. When the air containing particulate matter flows through the sensor pipe, the particulate matter in the air inside the pipe will cause laser scattering, and the photoelectric element collects the changes in the intensity of the scattered light. The subsequent acquisition circuitry calculates the equivalent particle size of the particles and the number of particles of different sizes per unit volume based on MIE theory.

Advantages of PM Sensors/Dust Sensors

• High Sensitivity: The PM sensor employs advanced principles such as laser scattering or infrared detection, enabling precise capture of particles as small as 0.3μm.
• Real-time Monitoring: Fast response time and support for high-speed sampling allow for rapid detection of particulate matter concentration changes and real-time air quality monitoring.
• Multi-Particle Size Detection: Simultaneously outputs the concentration and quantity of different particle sizes (e.g., PM0.3, PM1.0, PM2.5, PM10), meeting comprehensive analysis needs.
• High Integration: Both infrared and laser dust sensors support continuous online detection and are easily integrated into various terminal devices.
• Easy Maintenance: Possesses strong anti-interference capabilities and long-term durability, low cost, low power consumption, and compact size, making it suitable for various environmental air quality monitoring needs.

PM Sensor/Dust Sensor Applications