Common Transceiver LIF⁃Lidar Based on Y⁃Type Optical Fiber for Marine Oil Spill Detection

This paper presents a novel laser⁃induced fluorescence(LIF)Lidar system for marine oil spilling detection.A bifurcated Y⁃type optical fiber and an optical collimating lens compose a coaxial configuration transceiver for this LIF⁃Lidar system.This LIF⁃Lidar system was further applied to measure the excitation spectra from floating oil slicks with different thicknesses on top of seawater at different distances.The system presents several advantages such as compact structure,stable optical path,and convenient operation,which offers a wide application prospect in ocean exploration.

多波长荧光激光雷达测生物气溶胶的数值模拟计算

多波长荧光激光雷达系统用来在生物气溶胶或烟尘到达地面之前进行远距离探测,该系统是一种主动遥感系统,同时具有紫外和红外探测的能力。紫外波长能够提供对生物气溶胶云近实时的探测,并具有一定的分辨能力;红外波长的使用扩大了系统对气溶胶云的探测距离。文中对系统进行了简单描述,同时估算了激光诱导荧光技术探测生物气溶胶的能力,对白天和晚上探测生物气溶胶粒子的信噪比进行了数值模拟,分析了影响信噪比的因素,对实际系统的构建具有指导意义。

海洋激光雷达在渔业资源调查和生态环境监测中的应用

海洋激光雷达是最先进、最有效的海洋调查手段之一,激光雷达与海洋生物相关的应用主要体现在渔业资源调查和海洋生态环境监测两方面。前者常采用蓝绿脉冲光作为激发光源,通过对激光回波信号的识别提取以获得鱼群分布区域和密度信息,结合偏振特征分析可对鱼群种类进行识别;后者常采用海洋激光荧光雷达,通过对激光诱导目标物发射的荧光等光谱信号的探测分析以获得海洋浮游生物及叶绿素等物质的种类和浓度分布信息。本文对这两种海洋激光雷达的技术原理、国内外发展现状进行了详细的论述,并对今后的发展趋势进行了展望。