Li Chong, Zeng Yinong, Zhu Caihui, Yi Zihan, Zhao Hui, Qiu Jian, Tang Yu Mei, Liu Kefu
Appl Opt. 2024 Apr 20;63(12):3228-3236. doi: 10.1364/AO.520324.
Due to its numerous advantages such as high gain and low operating bias, the silicon photomultiplier (SiPM) holds great potential in LiDAR applications. However, it is more jittery at weak echoes and more sensitive to ambient light, making its ranging performance at low signal-to-noise ratios (SNRs) severely deteriorated. To enhance the ranging performance of SiPM LiDAR under low SNR, a novel echo processing method, to the best of our knowledge, was proposed based on the statistical property of SiPM responses and validated under relatively intensive sunlight (>50 ) using a self-developed LiDAR system. At the same time, laser pulse width modulation and multi-pulse laser emission are used in ranging experiments to maximize the advantages of this method. It has shown that increasing the laser pulse width within a certain range can improve ranging performance, and that emitting multiple laser pulses improves ranging performance more significantly. Utilizing a three-pulse laser with a peak power of only 3.2 W, a target 122 m away was ranged with a precision of 6.53 cm with only five accumulations.
由于硅光电倍增管（SiPM）具有高增益和低工作偏置等诸多优点，它在激光雷达应用中具有巨大潜力。然而，它在弱回波时抖动更大，对环境光更敏感，这使得其在低信噪比（SNR）下的测距性能严重恶化。为了提高低信噪比下SiPM激光雷达的测距性能，据我们所知，基于SiPM响应的统计特性提出了一种新颖的回波处理方法，并使用自行研制的激光雷达系统在相对强烈的阳光（>50 ）下进行了验证。同时，在测距实验中采用激光脉冲宽度调制和多脉冲激光发射，以充分发挥该方法的优势。结果表明，在一定范围内增加激光脉冲宽度可以提高测距性能，发射多个激光脉冲对提高测距性能的效果更显著。使用峰值功率仅为3.2 W的三脉冲激光，仅通过五次累积就对122 m外的目标进行了测距，精度达到6.53 cm。
