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当前研制的快速成像无扫描激光雷达系统由于激光器功率和信号损耗的限制,遇到了无法增大作用距离的瓶颈。结合光外差体制和APD阵列探测器设计的APD阵列外差探测激光雷达系统可以有效地解决这个问题。鉴于光学系统的外差效率能够直接影响外差激光雷达的性能,因此照明方式的设计是该套激光雷达系统的一个关键。经过分析,传统的直接扩束照明模式下系统的平均外差效率仅为10-5量级,远无法打到使用要求;因此提出了采用改进的点阵照明,并采用在阵列探测器前置微透镜阵列实现匹配接收的方式来解决这一问题。计算结果显示,经过优化后的点阵照明模式下的系统外差效率可达0.82,进而证明了采用点阵照明设计的APD阵列外差激光雷达系统的性能可以达到实用要求,为进一步开展APD阵列外差激光雷达的研究工作奠定了理论基础。
At present, the rapid imaging scanning-free lidar system has been confronted with the bottleneck that can not increase the working distance due to the limitation of laser power and signal loss. The APD array heterodyne detection Lidar system combined with the optical heterodyne system and the APD array detector can effectively solve this problem. Since the heterodyne efficiency of the optical system can directly affect the performance of the heterodyne Lidar, the design of the illumination mode is a key to the Lidar system. After analysis, the traditional system of direct beam expansion under the average heterodyne efficiency of only 10-5 orders of magnitude, far from being hit to the use requirements; therefore, the use of improved lattice lighting, and used in front of the array detector Micro-lens array to achieve the matching reception to solve this problem. The calculated results show that the system heterodyne efficiency can reach 0.82 after the optimized lattice lighting mode, which proves that the performance of the APD array heterodyne laser radar system using the lattice lighting design can meet the practical requirements. In order to further develop the APD array Heterodyne laser radar research laid the theoretical foundation.