多普勒激光雷达单纵模稳频激光脉冲鉴别技术

发布时间：2018-01-14 13:46

本文关键词：多普勒激光雷达单纵模稳频激光脉冲鉴别技术　出处：《中国科学技术大学》2017年硕士论文　论文类型：学位论文

【摘要】：精确的大气风场观测对提高长期天气预报的准确性、军事环境预报以及提高国防安全等方面具有重大意义。随着临近空间科学的不断发展,对15～60km高度范围的风场探测显得尤为重要。在众多探测手段中,多普勒测风激光雷达以其高分辨率,高精度,大探测范围,能提供三维风场信息的能力,引起了国内外学者的关注,并投入了大量人力、物力进行研究。论文在第二章介绍了种子注入式激光器的原理以及多普勒测风激光雷达原理,进而引出了对单纵模稳频激光脉冲鉴频方法的研究。论文第三章主要是针对种子激光注入不成功时的多纵模输出会影响测风的准确度出发,设计了一块脉冲筛选电路板,并对脉冲筛选电路的设计过程做了详细的介绍。首先分析了出射激光脉冲在多纵模情况下对风速测量的影响,种子注入与未注入时的风速灵敏度相差了两个数量级。种子未成功注入,调Q脉冲建立时间较长;种子成功注入,调Q脉冲建立时间短,而脉冲筛选电路就是通过检测激光脉冲在时域上的变化来判断种子注入的情况,并剔除种子未成功注入的激光脉冲。通过设计的脉冲计数卡和对应上位机软件对种子注入成功的脉冲个数进行统计。论文在第四章中对脉冲检测实验做了详细介绍。脉冲筛选电路结合三台种子注入式激光器进行实验,由于筛选电路对种子未成功注入的脉冲的剔除作用,在风速100m/s时三台激光器能够有效降低测风误差0.29m/s、3.25m/s和0.25m/s。
[Abstract]:Atmospheric wind field observation precision to improve the accuracy of long-range weather forecasting, is of great significance in military environmental prediction and improve national security and other aspects. With the continuous development of near space science, is particularly important for the altitude of 15 ~ 60km wind field detection is. In many detection methods, Doppler lidar with high resolution. High precision, large detection range, can provide the ability of three-dimensional wind field information, attracted the attention of scholars at home and abroad, and put a lot of manpower, material resources. This paper introduces the principle of seed injection laser and Doppler lidar principle in the second chapter, which leads to the study of laser pulse frequency discrimination method single longitudinal mode frequency stabilization. The third chapter is the multi longitudinal mode output for seed laser injection is not successful will of the accuracy of the wind influence, designed a pulse Screening of circuit board, and the design process of the pulse filter circuit are described in detail. Firstly analyzes the effect in the case of multi longitudinal mode laser pulse measurement of wind velocity, wind speed and sensitivity of seed injection injection is two orders of magnitude. The seeds were not successfully injected, Q pulse setup time longer seed of success; injection, Q pulse setup time is short, and the pulse filter circuit is to judge the seed implantation by detecting changes in the time domain of the laser pulse, laser pulse and remove the seeds were not successfully injected. Through the design of pulse counting card and the corresponding software of seed injection pulse number of success statistics. In fourth chapter, the pulse detection experiments are introduced in detail. The pulse circuit with the three screening seed injection laser experiment, because the screening circuit of the seeds were not successfully injected When the pulse is eliminated, three lasers can effectively reduce the wind measurement error 0.29m/s, 3.25m/s and 0.25m/s. when the wind speed is 100m/s

【学位授予单位】：中国科学技术大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P412.25

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