1550nm Radar Filter

As the level of intelligent driving gradually improves, automatic driverless car technology is one of the hottest and most widely discussed cutting-edge technologies in recent years. Among them, LiDAR radar in automatic driverless car technology is called Light Detection and Ranging, which is laser detection and ranging.

The working principle of LiDAR: Time of Flight (ToF) is to calculate the relative distance between the target and itself based on the return time after the laser encounters an obstacle. The laser beam can accurately measure the relative distance between the edge of the object contour in the field of view and the device. These contour information constitute the so-called point cloud and draw a 3D environmental map with an accuracy of up to centimeters.

The comprehensive performance of LiDAR radar is the most outstanding: compared with cameras, its detection results are more direct and reliable, and are not easily affected by the environment; compared with millimeter-wave radar, its data density and detection capabilities are better. The system's requirements for sensors will be more stringent, and LiDAR is constantly evolving to meet these needs. At present, LiDAR radars are classified according to whether there are mechanical rotating parts, including mechanical LiDAR, hybrid solid-state LiDAR, and all-solid-state LiDAR. According to the scanning working mode, it can be divided into: mechanical rotating scanning laser radar, MEMS laser radar, phased array laser radar. Flash laser radar.

At present, the more mature solution in LiDAR radar is mechanical rotating scanning laser radar. Mechanical rotating scanning laser radar mostly uses infrared band 905nm filter or 1550nm detection filter. However, the power of infrared laser in the 905nm band cannot be too large due to laws and regulations. Because the red light of 905nm is invisible, but it can be directly transmitted to the human retina, the detection distance of 905nm infrared light cannot meet the detection needs of driverless cars. Therefore, if LiDAR radar needs to reach the detection distance of 200-300 meters, the infrared light in the 1550nm band can meet the requirements (light greater than 1400nm cannot be projected to the retina). At present, the infrared light in the 1550nm band is also a relatively mature application detection solution abroad.

Borisun is committed to the development of cutting-edge technology and has developed 1550nm infrared bandpass filters with multiple bandwidths, different transmittances and cut-off depths. Currently, it provides 1550nm LiDAR radar optical filter solutions to many domestic and foreign communication and LiDAR radar companies.