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Development of a Meteorological Lidar for the Analysis of Atmospheric Dynamical Behavior

开发用于分析大气动力学行为的气象激光雷达

基本信息

批准号：
10358013
负责人：
KOBAYASHI Takao
金额：
$ 13.63万
依托单位：
Fukui University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10358013/
关键词：
Lidar Laser Radar Doppler lidar Rotation Raman Vibration Raman Wind Velocity Temperafure・Humidity Remote Sensing ドップラー方式気温

项目摘要

The purpose of this research is to develop a practical meteorological lidar or laser radar system for remotely measuring major meteorological parameters of wind, temperature and humidity in the troposphere. The system is useful for analyzing fundamental dynamical properties of the atmospheric environmental issues. A compact and light-weight lidar has been developed and tested for practical application as the remote atmospheric sensing system.(1) Development of eye-safe multi-function lidar system for wind, temperature and humidity sensing. The UV single frequency laser at 355 nm with 0.6 W average power was used with a 20-cm diameter telescope and a photon counting detectors. For the wind measurement, a high-resolution filter of the Fabry-Perot etalon was employed in the direct detection Doppler lidar scheme. The temperature sensing is based on the rotational Raman scattering scheme using two-channel grating filters and the humidity is on the vibrational Raman scattering scheme using a single grating filter. The spatial profiles of these major meteorological parameters could be measured simultaneously. The accuracy of the wind measurements was finally tested to be 1.5 m/s at 3 km range, temperature accuracy was 1K at 1.5 km range and humidity was 10% at 2 km range.(2) Development of a compact Doppler lidar with a LD-pumped single-frequency, Q-switched Nd : YAG laser. A LD-pumped compact Q-switched solid-state Nd : YAG laser has been developed. The injection seeding and the traveling wave cavity technique was employed for the single frequency oscillation. Frequency stabilization technique was applied and the pulse frequency stability was 0.23 MHz for 3W average power at 10-kHz pulse repetition frequency. The second harmonic beam at 532 nm was used for the wind measurement using a scanning 20 cm diameter telescope. The wind measurement was possible at the range of 3 km with theaccuracy of 0.6 m/s.

本研究的目的是开发一种实用的气象激光雷达或激光雷达系统，用于远程测量对流层的风、温度和湿度等主要气象参数。该系统可用于分析大气环境问题的基本动力学特性。一种紧凑、轻量的激光雷达已经开发出来并进行了实际应用测试，作为远程大气传感系统。(1)开发了用于风、温度和湿度传感的人眼安全多功能激光雷达系统。使用平均功率为 0.6 W 的 355 nm 紫外单频激光，配合直径 20 cm 的望远镜和光子计数探测器。对于风测量，直接探测多普勒激光雷达方案采用了法布里-珀罗标准具的高分辨率滤波器。温度感测基于使用双通道光栅滤波器的旋转拉曼散射方案，湿度感测基于使用单光栅滤波器的振动拉曼散射方案。这些主要气象参数的空间剖面可以同时测量。最终测试风速测量精度在3 km范围内为1.5 m/s，在1.5 km范围内温度精度为1K，在2 km范围内湿度为10%。(2)开发带有LD泵浦单频调Q Nd:YAG激光器的紧凑型多普勒激光雷达。开发了 LD 泵浦紧凑 Q 开关固态 Nd : YAG 激光器。单频振荡采用注入种子和行波腔技术。应用频率稳定技术，在 10kHz 脉冲重复频率下，平均功率为 3W 时，脉冲频率稳定性为 0.23MHz。 532 nm 的二次谐波光束用于使用直径 20 cm 的扫描望远镜进行风测量。测风范围为3 km，精度为0.6 m/s。