【作者】 郜键；

【导师】 王骐；

【作者基本信息】 哈尔滨工业大学 ， 物理电子学， 2007， 硕士

【摘要】 由于具有分辨率高、灵敏度高等优点,具有很大的应用前景,激光测风雷达是近些年来发展非常迅速的一种测风雷达体制。特别是在海洋上空洁净大气中气溶胶含量少,利用同时测量大气分子和气溶胶后向散射来反演大气风速的激光测风雷达具有很大的应用价值。本课题就是采用355nm紫外激光运用直接探测体制来测量洁净大气下的风场。根据本课题运用的背景,激光测风雷达采用直接探测体制。直接探测技术使用单边缘技术或双边缘检测技术,可以实现较高的风场测量精度和测量分辨率,并有比较远的作用距离和探测范围。文章对多普勒激光测风雷达的基本原理进行了介绍,并对基于其原理的直接探测测风雷达进行详细的论述,对其关键技术双边缘检测进行了介绍和理论计算,其中主要工作如下:一基于海洋上空纯净大气背景,计算出了大气后向散射系数与探测距离的关系,并且通过计算得出了F-P标准具半高宽的理想数值。二在前面理论仿真基础上,根据需要对激光测风雷达各个部分进行分析,包括激光的发射系统、光学接收系统、控制和处理系统等。特别是鉴频部分的设计是最关键部分,对其进行了详细的设计介绍。通过理论计算和实际需要对其它各个部分的参数进行了初步设定。三对标准具性能检测实验进行了设计。通过实验检测得到了透过率曲线。四通过对入射光的入射角、发散角、表面质量以及平行度对透过率曲线的影响,为后续的测风实验提供理论基础。更多还原

【Abstract】 Because of its high sensitivity and accuracy in last years , the wind measurement Doppler lidar has developed very quickly and has the greatly applied foreground. Especially in the clean atmosphere where there is little aerosols, the lidar has the greatly applied value to the wind measurement. This topic talks about the direct-detection lidar which gets the wind velocity of the clean atmosphere with which wave length is 355nm.According to the background, this topic uses the direct-detection principle. The direct-detection technique that adopts the edge technique or the double-edge technique has the high-accuracy and resolving-power to get the wide wind field.This paper introduces the principle of the Doppler lidar wind measurement, the direct-detection technique , the key part-the double edge technique and the detection of double-edge filter . The mainly working as follows:Firstly, on the foundation of the clean atmosphere above the sea, we get the change between the scatter of the atmosphere and the distance. By the calculation of the etalon HWHM we get its ideal number value.Secondly, this paper designs the parts of this system including the laser receives system, control and the processing system, especially the main parts of the laser and etalon. Then the index of this system is confirmed by calculating.Thirdly, with the experiment of detecting the F-P etalon, we get the curve of the transparence.At last, through the analysis of effect with the laser incidence angle, radiation angle, surface quality and the parallel, the paper introduces the design to analysis and performance of the Fabry-Perot etalon for the direct-detection wind measurement Doppler lidar.更多还原