Study on Remote Sensing of Wind Field by Incoherent Doppler Lidar

从机场附近的航线安全和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。为了探测大气边界层中的风，我们研制了一套基于边缘技术的多普勒激光雷达系统。在该系统中，我们采用了注入种子激光器作为发射器，法布里-珀罗涉仪作为高分辨率滤光器。这项工作的进展速度比原来的计划慢了一些，我们刚刚完成了基本阶段。(1)法布里-珀罗涉仪的调整：利用He-Ne激光平行于镜轴进入法布里-珀罗涉仪，研究了法布里-珀罗涉仪PZT扫描输出的光谱。FINESSE读出约为40。(2)干涉图的观察：将注入的种子激光传输到激光干涉图中，并用CCD摄像机观察到干涉条纹图。(3)边缘技术的模拟：模拟边缘技术性能，考察激光光谱宽度和形状对边缘滤光片透过率和灵敏度的影响。通过与众多研究人员就多普勒激光雷达研究的最新趋势交换意见，我们可以获得一些信息。基于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方式。

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.