基于直接探测激光雷达平流层风速测量关键技术研究
文献类型：学位论文
| 作者 | 王亚慧 |
| 学位类别 | 硕士 |
| 答辩日期 | 2016 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 刘继桥 |
| 关键词 | 直接探测激光雷达 鉴频器 Fabry-Perot干涉仪 Fizeau干涉仪 风速误差 锁频 |
| 其他题名 | Stratospheric Wind Speed Measurement Key Technology Research Based on Direct Detection Lidar |
| 中文摘要 | 多普勒激光雷达探测体制中，直接探测相对于相干探测具有可测量大气分子多普勒频移的显著特点，特别适合平流层大气的风速探测,因此在该大气层多普勒探测中具有很大的研究价值和重要应用。 基于低平流层大气风速的探测目的，本文的主要研究工作如下： 首先比较分析和选择了适合于低平流层大气风速测量的鉴频器，即以双通道FP干涉仪和Fizeau干涉仪这两种干涉仪为鉴频器进行了鉴频器的优化和参数选择，分别对两个鉴频器测量大气风场的灵敏度、信噪比和测量误差进行了仿真计算和比较。依据1m/s的测量误差为鉴频器选择标准，分别模拟两种鉴频器所在多普勒激光雷达系统中的探测能力，资源和硬件配置；然后优选了双通道FP干涉仪作为鉴频器能满足探测误差要求。而Fizeau干涉仪作为鉴频器的多普勒激光雷达系统虽然省却了锁频子系统，但需要高灵敏度和高度读取速率的多元线阵探测器才可以实现，而该探测器还没有成熟的产品，随着探测器技术的成熟将来可得到应用。最后利用低平流层大气参数优化设计了一套Fizeau干涉仪作为鉴频器的激光雷达系统参数，一套FP干涉仪作为鉴频器的激光雷达系统参数。 然后根据选定优化的多普勒激光雷达系统参数，开展风速探测误差理论分析。根据大气S6模型，模拟仿真了温度测量精度，压力测量精度，平台姿态测量精度（俯仰角、翻滚角和航向角）等多种误差源导致的速度测量误差，为激光雷达测量能力评估提供了参考，例如：温度测量误差导致的速度误差为2.9‰。 最后，基于双FP干涉仪设计了双边缘锁频技术方法。该方法的特殊优势是探测通道和锁频通道不再分开，同时具有风速探测和稳频的功能，不会造成额外的误差。同时介绍了种子激光器的碘分子稳频实验，实现了种子激光高精度频率稳定控制。 |
| 英文摘要 | Doppler lidar direct detection system compared to the coherent detection has distinctive features of detecting atmospheric molecules scattering signal Doppler frequency shift, especially for stratosphere atmosphere wind speed measurement ,which has great research values and important applications. Based on low stratosphere atmospheric wind speeds detection purpose, the main research work of this thesis are presented as the followings: Firstly, through comparative analysis, we choose frequency discriminator that is suitable for low stratosphere atmospheric wind speed measurement. According to the dboule Fabry-Perot(FP) interferometer and Fizeau interferometer frequency discriminator parameters optimization, the atmospheric wind field measurement sensitivity, signal-to-noise ratio and measurement error are calculated and simulated. The wind speed measurement error of 1 m/s is acted as the discriminator selection criteria. The two kinds of Doppler frequency discriminators detection ability and hardware parameters design of the two discriminators are presented. And the double FP interferometer is acted as the preferred discriminator for high accuracy wind speed measurement. Although Fizeau interferometer system needn’t lock the frequency, high sensitivity and high frame rate of the linear array detector have to be met., which can be realized in future. The part of the main innovation point is that by using low stratosphere atmospheric model parameters, we have got the optimized Fizeau interferometer and FP interferometer discriminator parameters. Then, according to atmospheric S6 model, wind speed errors caused by a variety of error sources, such as, temperature measurement precision, pressure measurement precision, platform attitude (pitching Angle, roll Angle and heading Angle) measurement precision are simulated. They provide reference for the laser radar measurement capability assessment. And the velocity error caused by temperature error is 2.9 ‰. At last, locking frequency technology method based on double FP interferometer technology method is analyzed. The special advantages of the method is that the detection channel and the frequency locking channel are the same, which have the function of wind speed detection and laser frequency stabilization at the same time, which will not cause additional error. Also the seeder frequency stabilization experiment based iodine cell absorption line is presented. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16960]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 王亚慧. 基于直接探测激光雷达平流层风速测量关键技术研究[D]. 中国科学院上海光学精密机械研究所. 2016. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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