蓝绿光双波长船载海洋激光雷达系统设计与海上测试  

Design and test of a blue-green dual-wavelength oceanic lidar system

作　　者：纪鲁峰 刘秉义[1] 朱培志 刘金涛[1] 张凯临[1] 吴松华[1,2] 唐军武 Ji Lufeng;Liu Bingyi;Zhu Peizhi;Liu Jintao;Zhang Kailin;Wu Songhua;Tang Junwu(Department of Marine Technology,Faculty of Information Science and Engineering,Ocean University of China,Qingdao 266100,China;Institute for Advanced Ocean Study,Ocean University of China,Qingdao 266100,China;Laoshan Laboratory,Qingdao 266237,China)

机构地区：[1]中国海洋大学信息科学与工程学部海洋技术学院,山东青岛266100 [2]中国海洋大学海洋高等研究院,山东青岛266100 [3]崂山实验室,山东青岛266237

出　　处：《红外与激光工程》2024年第3期213-223,共11页Infrared and Laser Engineering

基　　金：国家重点研发计划项目(2022YFB3901702)。

摘　　要：海洋水体的光学特性参数是海洋研究关注的重点之一,大部分光学特性具有随深度变化的特征,而海洋激光雷达是有效探测水体剖面信息的技术手段之一。基于水体光学特性参数剖面探测的需求,研制了蓝绿光双波长船载海洋激光雷达系统,光源采用在水体中衰减系数较小的蓝绿波长以获取更大的探测深度。该系统具备双波长和偏振探测通道,用于同步获取水体后向散射回波信号和偏振信号,可实现近岸和大洋水体的连续探测。文中首先介绍了激光雷达系统的设计方案,包括发射、接收、采集及控制子系统以及辅助设施,随后对数据预处理方法进行了阐述,包括质量控制、峰值位置对齐、去除背景噪声及退卷积等。系统于近海进行探测实验,验证了激光雷达系统的可靠性。结果显示:在清洁大洋水域,486 nm的激光雷达衰减系数小于532 nm,意味着在开阔水域486 nm具有更好的探测性能。Objective The optical characteristic parameters of marine water are one of the key points of marine research.Most of the optical characteristics vary with depth,and oceanic lidar is one of the effective technical means to detect water profile information.Based on the requirement of water optical profile detection,a two-wavelength oceanic lidar system with blue and green light is developed.The light source uses blue and green wavelength with small attenuation coefficient in water to obtain a larger detection depth.The system has dual wavelength and polarization detection channels,which can be used to obtain the backscattered echo signal and polarization signal simultaneously,and can realize the continuous detection of nearshore and ocean water.This paper first introduces the design scheme of the lidar system,including transmitting,receiving,acquisition and control subsystem and auxiliary facilities,and then describes the data preprocessing methods,including quality control,peak alignment,background noise removal and deconvolution.The reliability of the lidar system is verified by the detection experiment in the offshore.The results show that in clean ocean waters,the attenuation coefficient of 486 nm lidar is less than 532 nm,which means that 486 nm has better detection performance in open water.Methods The lidar system consists of transmitting,receiving,acquisition and control subsystems and auxiliary facilities(Fig.1-2).The transmitting subsystem is used to transmit 486 nm and 532 nm linearly polarized light to detect the target.The receiving subsystem is responsible for receiving and detecting the echo signal of the water target and realizing the photoelectric conversion.The acquisition and control subsystem is responsible for highspeed data acquisition and storage,system integrated control and state monitoring.Auxiliary facilities are used to ensure that the lidar works in a stable working environment.Then the data preprocessing methods are introduced,including quality control(Fig.5),peak position alignment(Fi

关 键 词：海洋激光雷达 水体光学特性参数 剖面探测 激光雷达衰减系数 

分 类 号：O439[机械工程—光学工程]