Research progress of temperature, humidity and pressure detection technology using raman lidar
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摘要:
温度、湿度、压强是3个重要的大气参数。快速、准确地了解大气的温度、湿度和压强信息及其变化趋势,对天气、气候、人工影响天气等研究有重要意义。拉曼激光雷达通过分离拉曼散射信号反演得到各种大气环境相关参数,可实现对大气参数廓线信息的高精度探测,在大气温湿压探测中独具优势与潜力。本文介绍了拉曼激光雷达对大气温度、湿度和压强的探测原理与反演方法,着重介绍了拉曼激光雷达中滤光片、标准具、光栅等常用分光器件的优缺点及其进展,以及拉曼激光雷达中涉及到的探测技术。最后例举了利用拉曼激光雷达对气象参数测量的典型应用。
Abstract:Atmospheric temperature, humidity and pressure are deemed important atmospheric parameters. Quickly and accurately understanding the temperature, humidity and pressure information of the atmosphere and their changing trends is of great significance to research on meteorology, climatology, and artificial weather research. Raman lidar can obtain various atmospheric environment-related parameters by separating Raman scattering signal inversion, which can achieve high accuracy detection of atmospheric parameter profile information. Raman lidar has unique advantages and potential in atmospheric temperature, humidity and pressure detection. With an introduction to the principle and inverse analysis algorithm of Raman lidar for atmospheric temperature, humidity and pressure detection, this paper also highlights the advantages and disadvantages along with related advances of spectral devices such as filters, etalons and gratings commonly used in Raman lidar. The detection techniques involved in Raman lidar are also included. Finally, typical applications of meteorological parameter measurements by Raman lidar are shown.
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图 4 多色仪示意图。OF,光纤;L1–L5,透镜;IF1a–IF4,干涉滤光片;ND,中性密度衰减器;PMT1–PMT4,分别用于检测弹性、低和高量子数转动拉曼和N2振动转动拉曼信号的光电倍增管[24]
Figure 4. Schematic diagram of polychromator. OF, optical fiber; L1–L5 ,lenses; IF1a–IF4,interference filters; ND, neutral density attenuator; PMT1–PMT4, photomultiplier tubes for detection of the elastic, low- and high-quantum-number rotational Raman and N2 vibrational–rotational Raman signals, respectively[24]
图 7 武汉大学用于测量大气温度和气溶胶光学特性的单线提取转动拉曼激光雷达的光学布局。BS,分束器;L,透镜;IF,干涉滤光片;FPI,Fabry-Perot标准具;PMT,光电倍增管[35]
Figure 7. Optical layout of single-line-extracted PRR lidar proposed by Wuhan University for measuring atmospheric temperature and aerosol optical properties. BS, beam splitter; L, lens; IF, interference filter; FPI, Fabry-Perot interferometer; PMT, photo-multiplier tube[35]
表 1 PMT 和APD性能比较
Table 1. Performance comparison of PMT and APD
PMT APD 工作波段 适用于紫外到近红外波段,响应光谱范围为200~900 nm 适用于红外波段,响应光谱范围为400~1650 nm 增益 104~107 102~103 量子效率 20%~25% 线性模式下可以达到80%,而盖革模式下可以达到40%~50%. 脉冲上升时间 ~1 ns Si:0.1~2 ns
Ge:0.5~0.8 ns
InGaAs:0.1~0.5 ns抗磁场性 弱 强 表 2 MCP-PMT和SiPM性能比较
Table 2. Performance comparison of MCP-PMT and SiPM
MCP-PMT SiPM 工作波段 从真空紫外到近红外波段 4000~1100 nm 增益 105~106 105~106 量子效率 20%~25% 25%~70% 上升时间 200~800 ps ~1 ns 抗磁场性 良好 强 -
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