Huang Chien-Wei, Liu Chun-Nien, Mao Sheng-Chuan, Tsai Wan-Shao, Pei Zingway, Tu Charles W, Cheng Wood-Hi
Department of Electrical Engineering, National Chun Hsing University, Taichung 402, Taiwan.
Graduate Institute of Optoelectronic Engineering, National Chun Hsing University, Taichung 402, Taiwan.
Sensors (Basel). 2024 Mar 15;24(6):1897. doi: 10.3390/s24061897.
A new scheme presents MEMS-based LiDAR with synchronized dual-laser beams for detection range enhancement and precise point-cloud data without using higher laser power. The novel MEMS-based LiDAR module uses the principal laser light to build point-cloud data. In addition, an auxiliary laser light amplifies the single-noise ratio to enhance the detection range. This LiDAR module exhibits the field of view (FOV), angular resolution, and maximum detection distance of 45° (H) × 25° (V), 0.11° (H) × 0.11° (V), and 124 m, respectively. The maximum detection distance is enhanced by 16% from 107 m to 124 m with a laser power of 1 W and an additional auxiliary laser power of 0.355 W. Furthermore, the simulation results show that the maximum detection distance can be up to 300 m with laser power of 8 W and only 6 W if the auxiliary laser light of 2.84 W is used, which is 35.5% of the laser power. This result indicates that the synchronized dual-laser beams can achieve long detection distance and reduce laser power 30%, hence saving on the overall laser system costs. Therefore, the proposed LiDAR module can be applied for a long detection range in autonomous vehicles without requiring higher laser power if it utilizes an auxiliary laser light.
一种新方案提出了基于微机电系统（MEMS）的激光雷达，其具有同步双激光束，可在不使用更高激光功率的情况下增强检测范围并获取精确的点云数据。这种新型基于MEMS的激光雷达模块利用主激光构建点云数据。此外，辅助激光可放大单噪比以增强检测范围。该激光雷达模块的视场（FOV）、角分辨率和最大检测距离分别为45°（水平）×25°（垂直）、0.11°（水平）×0.11°（垂直）和124米。在激光功率为1W且辅助激光功率为0.355W的情况下，最大检测距离从107米提高到124米，提高了16%。此外，仿真结果表明，在激光功率为8W时，最大检测距离可达300米；若使用2.84W的辅助激光（占激光功率的35.5%），则仅需6W激光功率即可。这一结果表明，同步双激光束可实现长检测距离并降低30%的激光功率，从而节省整个激光系统成本。因此，如果采用辅助激光，所提出的激光雷达模块可应用于自动驾驶车辆的长距离检测，而无需更高的激光功率。
