A laser dust sensor is a sensor that utilizes laser technology for dust concentration measurement. It consists of a fan, a laser diode, a receiver, and a measurement circuit. It can accurately measure the concentration of dust particles in the air and is currently the highest precision dust sensor available. It is widely praised not only for its ability to detect the number of particles per unit mass but also for its extremely low error rate and consistency, leading to its widespread use in many high-end smart products. What is the working principle of a laser dust sensor? Below, the editor from Luftmy will provide a detailed introduction to help everyone understand.

Application fields for Luftmy laser PM2.5 dust sensors: Air purifiers, air conditioners with purification functions, PM2.5 detectors, range hoods, smoke alarms, fresh air systems, specialized PM2.5 sensors, air probes, wearable devices, etc.

Laser Dust Sensor Working Principle

The light source of a laser dust sensor is a laser diode. During operation, the laser emitting diode first sends out laser pulses. Simultaneously, the fan inside the sensor rotates to push air into the device through a complexly designed air duct for detection. When fine particulate matter in the air enters the area where the laser beam is located, it causes the laser to scatter. Scattered light radiates in 360° throughout the space. A photodetector is placed inside the sensor so that it only receives the scattered light. Then, through the photoelectric effect of the photodetector, a current signal is generated. After the circuit is amplified and processed, the concentration value of the fine particulate matter can be obtained.

Compared to infrared dust sensors, besides the different light source, the main difference of the laser dust sensor is the built-in fan. This allows for the active intake of air, enabling a more uniform measurement of particulate concentration in the air.