Laser dust sensors, based on the principle of laser scattering, can detect the concentration of suspended particulate matter (like PM2.5) of different sizes in the air, and are suitable for various air quality detection and purification systems in smart home devices.

The sensor uses a laser LED as the light source. When the light beam shoots to the fine particulate matter in the air, the laser will be scattered. And the built-in photodetector will collect the scattered light, with the current signal being generated by using the photoelectric effect. After the circuit is amplified and processed, the concentration of PM can be obtained. Finally, it is converted into mass concentration by microprocessor based on the Mie theory (MIE), and output in the form of the digital interface.

Laser dust sensors are mainly used in the field of PM2.5 detection to quantify the quality of PM2.5 with precision, and can be embedded in various devices, such as household (vehicle, handheld) air detectors, air purifiers and other equipment for environmental improvement. In addition, these products are also applied in the areas of Internet of Things data acquisition, environmental quality testing and so on.

Laser-type PM sensors emit laser with fixed wavelength. Because the laser can be focused into a very concentrated parallel beam, and maintain a small diffusion angle and a high power density over a long distance, this sensor features strong focusing capability and coherence, good monochrome performance and high power density. And compared with other sensors (such as an infrared type), it has obvious advantages in detection accuracy, sensitivity and consistency. Laser dust sensors can detect particles as small as 0.3μm and have excellent anti-interference ability. And they are able to finish real-time data collection and detection, effectively dealing with different scenarios and complex environments. Built-in high-performance lasers and photoelectric receivers ensure the accuracy and consistency of data.