基于直线型Sagnac干涉仪结构的脉冲激光雷达  

Pulse Lidar Scheme Based on Linear Sagnac Interferometer Structure

作　　者：袁羽齐 陈雯柏[2] YUAN Yu-qi;CHEN Wen-bai(International School,Beijing University of Posts and Telecommunications,Beijing 100876,China;School of Automation,Beijing Information Science and Technology University,Beijing 100101,China)

机构地区：[1]北京邮电大学国际学院,北京100876 [2]北京信息科技大学自动化学院,北京100101

出　　处：《火力与指挥控制》2021年第7期111-117,共7页Fire Control & Command Control

基　　金：北京市自然科学基金资助项目(4202026)。

摘　　要：针对背景环境光干扰影响脉冲激光雷达性能这一技术问题,提出一种基于直线型光纤Sagnac干涉仪结构的脉冲激光雷达方案。探测目标的激光脉冲往返两次通过延迟干涉仪形成直线型Sagnac干涉,其干涉脉冲由平衡光电探测器检出,利用飞行时间法来进行待测目标距离检测。环境干扰光因单次通过延迟干涉仪,不符合相干条件,再经过平衡光电探测器光电转换后被抵消。基于OptiSystem软件搭建仿真平台进行的有效性验证实验表明,该方案不仅能有效抵消太阳光等背景环境光的干扰,还能解决不同激光雷达之间的相互干扰,同时还具有形式简单、性能可靠的优点。Aiming at the technical problem that the background light interference affects the performance of pulse lidar,a pulse lidar scheme based on linear fiber Sagnac interferometer structure is proposed.The linear Sagnac interference is formed when the laser pulse of the detected targets,goes back and forth twice through the delayed interferometer.The interference pulse is detected by the balanced photodetector,and the time-of-flight method is used to detect the distance of the targets to be measured.Because the ambient interference light passes through the delayed interferometer for a single time,it does not meet the coherent conditions and the light is offset after the photoelectric conversion of the balanced photodetector.The validity verification experiments based on the simulation platform built by OptiSystem software show that the scheme can not only effectively offset the interference of background ambient light such as sunlight,but can also solve the mutual interference among different lidar.Meanwhile,it has the advantages of simple form and reliable performance.

关 键 词：脉冲激光雷达 飞行时间法 背景光干扰 直线型Sagnac干涉仪 OPTISYSTEM 

分 类 号：TN95[电子电信—信号与信息处理]