Simulation of wind field detection by laser heterodyne spectrometer

Jun Li,Xiao-Ming Gao,Zheng-Yue Xue,Kun Liu,Jing-Jing Wang,Xiao-Hai Liu,Tu Tan,Gui-Shi Wang

doi:10.7498/aps.71.20211252

Abstract

The middle- and upper- atmosphere wind field are important parameters that characterize the middle- and upper-atmosphere environment, respectively. The detection of the middle- and the upper-atmosphere wind field are of great significance in the civil field and military field. Laser heterodyne spectroscopy technology is a passive remote sensing detection technology with high spectral resolution and sensitivity, and has developed rapidly in recent years. The laser heterodyne spectrometer that takes laser heterodyne spectroscopy technology as its core, is developed due to its small size, light weight and stable structure. The verification of the ground-based wind field detection performance of the laser heterodyne spectrometer is a key part of its application to satellites. In this paper, a wind speed simulation device is built in a laboratory environment to achieve a wind speed change from 0 m/s to 25 m/s in a wind field. A laser heterodyne spectrometer with a spectral resolution of 0.003 cm–1 is used to measure the CH4 absorption spectrum without and with a wind field for different wind speeds, the resolution of measuring wind speed is 3 m/s. For relative and absolute calibration of the distributed feedback laser (DL) frequency, an interference fiber with a free dispersion range D* = 0.01167 cm–1, a wavemeter and a reference cell is used. The experimental results effectively verify the wind measurement performance of the laser heterodyne spectrometer and prove the possibility of using the laser heterodyne spectrometer to measure the atmospheric wind field.

Highlights

upper atmosphere wind field is of great significance
The laser heterodyne spectrometer developed with laser heterodyne spectroscopy technology as its core is due to
The verification of the ground-based wind field detection performance of the laser heterodyne spectrometer is a key part of its application to satellites

Summary

Introduction

李竣 1)2) 薛正跃 1)2) 刘笑海 2) 王晶晶 2) 王贵师 2) 刘锟 2) 高晓明 1)2)† 谈图 2)† 1)(中国科学技术大学环境科学与光电技术学院,安徽合肥 230031) 2() 中国科学院合肥物质科学研究院安徽光学精密机械研究所基础科学研究中心, 安徽合肥 230031) 摘要中高层大气风场是表征中高层大气环境的重要参量,对中高层大气风场的探测在民用和军用领域有着重要意义。激光外差光谱技术是近些年来迅速发展的一种高光谱分辨率和灵敏度的被动式遥感探测技术,以激光外差光谱技术为核心研制的激光外差光谱仪因其体积小、重量轻、结构稳定等特点,在星载测量中高层风场领域有巨大的潜力和应用前景。激光外差光谱仪的地面风场探测性能验证是其应用到卫星上的关键环节,本文利用实验室环境下建立的风场模拟装置实现 0m/s-25m/s 的风速变化,并基于光谱分辨率为 0.003cm-1 激光外差光谱仪分别测量了无风速变化和不同风速下的 CH4 吸收谱,测量风速的分辨率为 3m/s。使用光纤 F-P 干涉仪、波长计和参考池对激光器输出光频率进行实时的相对定标和绝对定标。通过计算吸收光谱中心频率的偏移量,反演得到风场风速,并与风场模拟器风速对比,相对误差为 1.49m/s。该实验对激光外差光谱仪测风性能进行有效验证,证明了使用激光外差光谱仪进行中高层大气风场测量的可能性。

Results

Conclusion