Study on Remote Sensing of Wind Field by Incoherent Doppler Lidar

从机场附近的航空安全以及城市地区的地球环境保护的角度来看，了解当地的风场是非常有用的。本文研制了一种基于边缘技术的多普勒激光雷达系统，用于大气边界层风的探测。在该系统中，我们采用注入种子Nd: YAG激光器作为发射器，采用Fabry-Perot干涉仪作为高分辨率滤光器。这项工作的进展速度比原计划慢了一些，我们刚刚完成了基本阶段。大纲将被描述。(1)法布里-珀罗干涉仪（FPI）的调整：采用平行于反射镜轴的He-Ne激光，研究了法布里-珀罗干涉仪pzt扫描输出的光谱。手腕的读数是40左右。(2) FPI干涉条纹的观察：将注入种子Nd: YAG激光传输到FPI上，通过CCD相机观察FPI的干涉条纹。(3)边缘技术仿真：对边缘技术性能进行仿真，考察激光光谱宽度和形状对边缘滤波器透射率和灵敏度的影响。通过与众多研究人员的交流，我们可以获得一些关于多普勒激光雷达最新研究趋势的信息。根据到目前为止已经澄清的事实，我们正在考虑今后这项研究的进展。

To know the wind field in local area is very useful from the standpoints of airline safety in the vicinity of airports and preservation of earth environment in the urban area. We have been developed a Doppler lidar system based on the edge technique for the detection of wind in the atmospheric boundary layr. In the system, we employed an injection seeded Nd : YAG laser as transmitter and a Fabry-Perot interferometer as high resolution optical filter. The work is progressing at a pace somewhat slower than the original schedule and we have just finish the fundamental stage. The outline will be described blow.(1) Adjustment of Fabry-Perot interferometer (FPI) : The spectrum of PZT-scanned output from the FPI was investigated with a He-Ne laser light which enters the FPI parallel to the mirror axis. Finesse is read out as about 40.(2) Observation of the interference pattern of FPI : The injection seeded Nd : YAG laser was transmitted to the FPI and the interference fringe pattern of FPI was observed by a CCD camera.(3) Simulation of the edge technique : Simulation of the edge technique performance was carried out to examine the effect of the laser spectral width and shape on transmission and sensitivity of the edge filter.We can obtain some information through exchange of opinion with many researchers about the latest trend of the Doppler lidar research. Based on the facts which have been clarified so far, we are considering the way to progress with this study hereafter.