激光距离选通的扫描式成像技术具有低成本、能避免多次散射等特点,成像扫描与激光束扫描的同步配合是扫描成像技术的难点。设计了一个基于空间光调制器(SLM)的扫描式距离选通激光雷达系统,保证目标反射光的可靠接收,并在时间上和空间上屏蔽后向散射光。在具有不同衰减长度的光散射环境中对本系统进行了测量,实现二维和三维成像。实验结果表明,本系统能够有效地实现光束扫描与距离选通成像扫描的同步,适用于光散射环境中光学成像的可视距离扩展。

Laser range-gated scan-type imaging technology has the advantages of lower cost and multiple scattering reduction. Synchronous operation between imaging scan and laser-beam scan is the technical difficulty in the scanning imaging technology. Herein, a scan-type range-gated LiDAR system based on spatial light modulator (SLM) is designed to temporally and spatially shield backscattered light while ensuring the reliable receipt of reflected light from the targes. Measurements are performed in light scattering environments with different attenuation lengths to realize the 2D and 3D imaging implementations. Experimental results show that the synchronization between light-beam scan and range-gated imaging scan can be effectively achieved in this system. Moreover, the proposed system is applicable to visible-range extension of optical imaging in a light scattering environment.