环境参数对激光水中传输衰减特性的影响

项目名称： 环境参数对激光水中传输衰减特性的影响

项目编号： No.41266001

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 刘娟

作者单位： 南昌航空大学

项目金额： 55万元

中文摘要： 在利用激光雷达系统探测水下物体的实验中，我们发现环境参数温度、压强的变化，对激光在水中传输衰减特性产生一定的影响。激光传输规律随的变化，直接决定着激光雷达系统的稳定性。前期对水中激光传输衰减特性的研究多着重于由水质本身吸收引起的衰减和因水中受激散射造成的能量损耗。本项目拟对环境参数对激光水中传输特性进行实验研究，通过数据和曲线分析，总结规律。首先制作模拟环境变化装置，使得温度和压强能够在一定范围内变化。测量激光在两种线宽（30GHZ和90MHZ）传输时，不同环境参数下的衰减系数，绘制衰减系数曲线。对衰减系数曲线进行比较，分析环境温度和压强对衰减系数、受激布里渊散射阈值和线宽的影响。总结规律，通过理论解释，完善衰减系数公式。项目还将对激光水中传输衰减系数进行全年侯监测，进一步分析环境因素对衰减特性带来的影响。该课题的研究成果可以用来评估激光雷达对环境的依赖性，指导激光雷达的进一步发展。

中文关键词： 激光雷达；激光传输；衰减系数；环境参数；布里渊散射

英文摘要： It was found in the experiment of lidar detecting objects in water that the attenuation charactristics of laser beam is affected by environmental parameters, such as temperature and pressure. The transimission of laser changed as well，what influenced the performance of lidar directly. The absorption caused by the water itself and the energy loss caused by stimulated scattering in it was always the focus of study . A detailed investigation about the affection of environmental parameters on coefficient of attenuation will be done in this project. Firstly,We will make devices that the environmental parameters required can change in it. And then many a coefficients of attenuation will be measured with various temperatures and pressures.The laser in the experiment has two line width (30GHZ and 90MHZ).Ploting graphs of coefficient of attenuation and compareing it ,we would find the affection of environmental parameters on the coefficient of attenuation,also on the threshold and line width of stimulated brillouin scattering. Finding the generality by analysis and explaining it on physics. And finally a new formula will be given ,including the paramters of temperature and pressure. Also ,we are going to measure the coefficient of attenuation with seasonal variation in a year. The project can value the Dependence o

英文关键词： lidar；Laser transmission；attenuation coefficient；environmental paramenter；Brillouin scattering