相干多普勒测风激光雷达外差效率的数值计算与分析  

Numerical Analysis and Calculation of Heterodyne Efficiency of Coherent Doppler Wind Lidar

作　　者：步志超[1] 陈思颖[1] 张寅超[1] 陈和[1] 郭磐[1] 陈文博[1] 陈胜哲[1] 葛宪莹[1] 

机构地区：[1]北京理工大学光电成像技术与系统教育部重点实验室,北京100081

出　　处：《北京理工大学学报》2012年第8期824-827,843,共5页Transactions of Beijing Institute of Technology

基　　金：国家重点基础研究发展计划(2009CB72400401B)

摘　　要：论述了相干多普勒测风激光雷达外差效率的基本理论.对同轴系统中本振光和发射激光均是截断高斯光束情况下的外差效率进行了研究,利用圆孔光阑函数展开为高斯函数相叠加的方法,给出外差效率的解析表达式;采用计算机软件Mathematica分析外差效率随菲涅尔数和截断因子的变化关系,给出最大外差效率随着菲涅尔数的变化曲线和不同菲涅尔数下最佳截断因子的取值.该研究为相干多普勒测风激光雷达探测理论的发展及系统器件的最优化配置提供了重要的理论依据.Basic principle of the heterodyne efficiency of coherent Doppler wind lidar is briefly described in this paper. Under the condition of coaxial system, the heterodyne efficiency of local and transmit truncated Gaussian beams was studied. By using the sum of Gaussian functions to replace the circular aperture function, the analytical expressions of heterodyne efficiency were derived. Then, the dependence of heterodyne efficiency on the Fresnel number and truncation factor could be numerically analyzed using Mathematica software. The relation of maximum heterodyne efficiency with the change of Fresnel number was revealed and the values of optimum truncation factor under different Fresnel numbers were obtained. This research has important theoretical significance and practical value both for the research and development of coherent Doppler wind lidar.

关 键 词：相干多普勒测风激光雷达 夫琅和费衍射 外差效率 

分 类 号：TN247[电子电信—物理电子学]