Zhang Cheng, Wang Yupeng, Yin Yongkai, Sun Baoqing
Opt Express. 2023 Jul 17;31(15):24481-24491. doi: 10.1364/OE.493153.
Single photon light detection and ranging (LiDAR) is an important technique for high precision long distance three-dimensional (3D) imaging. However, due to the effects and native limitations of system components, there exists ranging errors when using LiDAR system. For the LiDAR system that requires trigger detector to provide synchronization signals, the fluctuation of laser pulse energy causes the change of the initial time of the constant threshold triggered timing module, and subsequently leads to the ranging error. In this paper, we build a dual SPADs LiDAR system to avoid the ranging error caused by the fluctuation of laser pulse energy. By adding a reference optical path, the flight time of signal photons is corrected by reference photons, so as to realize the correction of ranging. A series of experiments demonstrate that the proposed LiDAR system has the capability of high precision ranging and 3D imaging. The system achieves range of error of 0.15 mm and range resolution of 0.3 mm at a distance of 29 m.
单光子光探测与测距（LiDAR）是一种用于高精度长距离三维（3D）成像的重要技术。然而，由于系统组件的影响和固有局限性，使用LiDAR系统时存在测距误差。对于需要触发探测器提供同步信号的LiDAR系统，激光脉冲能量的波动会导致恒定阈值触发定时模块的初始时间发生变化，进而导致测距误差。在本文中，我们构建了一个双单光子雪崩二极管（SPADs）LiDAR系统，以避免由激光脉冲能量波动引起的测距误差。通过添加一条参考光路，信号光子的飞行时间由参考光子进行校正，从而实现测距校正。一系列实验表明，所提出的LiDAR系统具有高精度测距和3D成像的能力。该系统在29米的距离上实现了0.15毫米的测距误差和0.3毫米的距离分辨率。
