学校代码：10406 分类号：TN249学号：************
南昌航空大学
硕士学位论文
大气布里渊散射光谱
及探测技术研究
硕士研究生：刘建安
导师：刘大禾教授，何兴道教授
申请学位级别：硕士
学科、专业：测试计量技术及仪器
草原上有什么
所在单位：测试与光电工程学院
答辩日期：2011年6月
授予学位单位：南昌航空大学
Rearch on Brillouin scattering spectra of atmospheric and detection technology
A Disrtation
Submitted for the Degree of Master
On Measuring and Testing Technologies and Instruments
By Jianan Liu
形容友情深厚的成语Under the Supervision of
Prof. Dahe Liu，Xingdao He
情侣套房College of Measuring and Optical Engineering
Nanchang Hangkong University, Nanchang, China
Jun.2011
摘要
新手如何片鱼片
基于布里渊散射的激光探测技术是一门前沿性的研究课题，是未来光散射激光探测技术的发展方向之一。利用布里渊散射技术可以测量大气的多种特征参数，如温度、气压、气体密度分布、大气声速、折射率、空气扰动等；在大气环境监测，军事气象保障，空气动力学研究，航空航天等领域具有重要的潜在应用价值。
鉴于常规条件下大气自发布里渊散射频移很小，通常和瑞利散射混在一起，按目前的探测技术无法把自发布里渊信号和瑞利信号准确的分离出来。而获得准确的布里渊频移量是利用布里渊散射来测量大气各种参数及应用的关键，为此，本文引入S6模型，从理论上仿真相应条件下的瑞利-布里渊散射谱型特征，通过把理论光谱和实测谱作比较来定性和定量分析布里渊频移特征，弥补探测系统分辨率和测量精度的不足。此外，本文模拟了不同海拔高度以及不同压强、温度条件下大气的布里渊背向散射谱型特征，分析了谱型变化规律，探讨了引起谱型变化的内在因素，为开展实验研究提供理论指导。模拟结果表明：基于布里渊散射的激光探测技术更适合低温层大气的探测，使用波长较长的单模激光，可以获得更高的布里渊频谱分辨率。
鸡蛋的英语怎么写
本文在布里渊散射理论和模型模拟仿真的基础上，讨论了用窄带单模激光来探测大气自发布里渊散射谱的方法，提出结合Fabry-Perol高光谱分辨率的激光直接探测技术，设计了实验探测系统，并开展了
开髋的好处
背向180°和侧向90°散射的可行性验证实验，虽然实测结果和理论偏差较大，但通过探索研究表明该技术是可行的。本文最后讨论了实验中遇到的问题以及探测系统存在的缺陷，给出解决问题的方法和改进系统的具体方案。
相比于目前国内外其它布里渊散射激光探测系统和方案，基于布里渊背向散射的单光束激光直接探测系统不但结构相对简单，体积较小，便于安装，具有发展成不同平台的布里渊散射激光雷达的潜力。结合其它电子技术，该系统可以进行远距离、实时的测量，实用性和潜在的应用价值很高。
关键字：布里渊背向散射，Fabry-Perol高光谱分辨率，激光探测系统，S6模型
Abstract
lar detection technology bad on Brillouin scattering is not only a frontier rearch subject，but is the new direction of development of lar detection technology in the future. Using Brillouin scattering technique can measure a variety of atmospheric parameters such as temperature, pressure, gas density distribution, air velocity, refractive index, air turbulence and so on. It has important potential applications in the atmospheric environmental monitoring, military, meteorological, air dynamics, aerospace and other fields.吃什么东西丰胸
In view of the spontaneous Brillouin frequency shift dispersion of atmosphere which under the normal conditions is very small. Brillouin and Rayleigh scattering signals are usually mixed together. It is difficult to accurately identified the spontaneous Brillouin and Rayleigh signals depend on current technology. But to obtain accurate Brillouin frequency shift is a key of using Brillouin scattering to measure the atmospheric parameters and application. Therefore, the S6 theoretical model was introduced in this paper. We have simulated spectrum shape characteristics of Rayleigh - Brillouin scattering according to appropriate conditions from the theoretical. It is can be to make up the resolution and accuracy of detection system deficiencies by qualitative and quantitative analysis of Brillouin frequency shift characteristics between measured spectra and theoretical spectrum. In addition, in order to carry out provide theoretical guidance for experimental study. We simulate Brillouin backscattering spectrum shape at different altitudes, different air pressure, temperature, and other atmospheric conditions, and analyzes internal factors which caud spectral shape of changes. The Simulation results show that: Brillouin scattering lar detection technique is more suitable for the detection of cryosphere atmosphere, using longer wavelength lar, can achieve higher resolution of the Brillouin spectrum.
We have discusd the method of using narrow-band single-mode lar to detect the atmospheric spectrum of spontaneous Brillouin scattering bad on theory and
蒸锅蒸米饭
model simulation, we have made with high spectral resolution Fabry-Perol direct detection of lar technology to design the experimental detection system in this paper. Although the error between experimental results and theoretical is larger, but this technology is feasible which has been confirmed through back 180 degree and 90 degree side scatter feasibility verification experiment exploration and rearch. In the end, this article not only discusd the problems encountered in the experiment and the detection system defects, but analysis of cau of the problem, given specific programs to solve problems and improve the system.
The system that bad on Brillouin backscattering in single beam lar direct detection not only with relatively simple structure, small volume and easy to install which compared to the other Brillouin scattering detection systems and programs other wi at homeland or abroad，but also having potential to development of lar radar with different platforms. Besides, this system can be ud to measurement by remote and real-time if combined with other electronic technology.
Key words: Brillouin backscattering, High spectral resolution Fabry-Perol, Lar detection system, S6 model
