BAS

The aerosol sensor detects the aerosol concentration through the light scattering principle. It is mainly used in the battery pack of electric vehicles, and transmits the detection value to the on-board battery management system through CAN signal communication.

The first is the infrared particle sensor (also known as the infrared dust sensor) represented by Sharp of Japan. The infrared particle sensor's light emitting and feedback receiving parts are all made of ordinary LED beads and photosensitive devices, which are easy to be interfered by external light sources. At the same time, the infrared particle sensor is basically designed with passive air duct, and there is no fan to introduce the measured air into the sensor itself, It relies on the natural flow of air to collect data. If the air flow is not good, it is easy to cause large deviation of the test data.

The second type of sensor. Different from the original infrared particle sensor, the laser particle sensor adopts the active constant flow air supply design. An independent constant flow fan provides 100ml of air per minute to enter the sensor for detection (the parameters of each manufacturer may vary). At the same time, the light-emitting part is also upgraded to a laser diode, the light source is more pure and concentrated and stable, and the feedback receiving part is also upgraded to a special photosensitive diode. In the circuit design, multi-level operational amplifiers are used to improve the detection signal ability, and the collected data are analyzed and calculated through the Mie algorithm, Finally, the PM2.5 concentration data was calibrated in combination with the benchmarking TSI equipment (made in the United States, which is a professional particle detection equipment in the industry and used as a standard reference). The calibration work has been carried out by various sensor manufacturers before shipment, so the consistency and stability of the laser particle sensor in the same batch are better than the infrared particle sensor.