基于线阵APD探测器的脉冲式一维非扫描激光雷达系统

Pulsed one-dimensional scannerless LiDAR system based on linear APD array

介绍了非扫描激光雷达的原理,描述了研制的基于线阵APD雪崩光电二极管的一维非扫描激光雷达系统。该系统使用线阵APD作为探测器,红外脉冲式纳秒激光器作为探测光源,利用飞行时间法实现了目标的一维距离图像的非扫描测量。系统使用了APD多通道并行前置放大电路,并利用模拟开关控制高速继电器进行多通道轮询切换,实现了APD阵列的多通道驱动,并有效地降低了通道间的串扰。进行了多组6～18 m的一维距离成像实验,结果表明系统的距离分辨率优于10 cm,各通道的平均测距标准偏差约为8.6 cm。该系统的设计为将来的面阵APD二维非扫描激光雷达的研制奠定了基础。

The principle of scannerless LiDAR was introduced.The developed one-dimensional scannerless LiDAR system based on linear APD was described.Linear array APD and infrared pulsed nanosecond laser were employed as detector and probe light source respectively.By using the time-of-flight pulsed laser rangefinding technique,the one-dimensional scannerless distance image of the target could be obtained.Parallel multi-channel pre-amplifiers were implemented and high-speed relays were used to switch between channels,by which,the isolation of channels were improved effectively.Several groups of one-dimensional distance imaging experiments were carried out.The results illustrate that the resolutions of multi-channel distance imaging are better than 10 cm and the average standard deviation for channels is approximate to 8.6 cm.The design in this system provides the basis on developing the two-dimensional scannerless LiDAR by APD planar array.