摘要
报道了利用自研高精度太阳追踪仪,建立了一套全光纤式激光外差光谱仪系统,对合肥科学岛(31.9°N,117.2°E)地区进行了实时大气光谱探测,在近红外波段(6437~6441 cm^(-1))得到了水同位素HDO分子的激光外差光谱信号。同时对吸收光谱进行了波长定标和离散标准化,得到了信噪比为46、光谱分辨率为0.0196 cm^(-1)的HDO整层大气透过率谱,并利用最优估计算法反演计算出HDO对流层的垂直浓度廓线。本文研究表明激光外差技术可以用于大气水汽同位素HDO的探测技术研究,为大气水汽同位素HDO的探测提供了新手段、新方法。
As an important driving factor of climate change of the global,water vapor plays an important role in the material and energy transmission and evolution of the earth system. As a natural greenhouse gas,the particularity of water vapor is that it can change among gas,liquid and solid under natural conditions,resulting in drastic changes in its abundance. With the intensification of global warming,the water vapor content in the atmosphere will also increase,thus forming positive feedback and accelerating warming.Isotope tracing is an important means to study the atmospheric cycle. The scientific problem of water vapor source and sink can be solved by obtaining water vapor isotope information. The distribution of water vapor is affected by many factors(such as surface geographical environment,latitude,temperature,etc.),and the concentration of water vapor varies greatly in different places and at different times. This requires that the measuring instrument must have the characteristics of miniaturization and portability in the technology to ensure the performance. As an atmospheric remote sensing method developed rapidly in the world in recent years,laser heterodyne spectroscopy has the characteristics of high signal-to-noise ratio,high spectral resolution and small volume. Based on this,using laser heterodyne technology to obtain the whole layer of atmospheric water vapor isotope information is an effective means. A system prototype of all fiber laser heterodyne spectrometer is established by using a self-developed high-precision solar tracker. In this paper,the laser heterodyne spectroscopy method is used to detect the atmospheric water vapor isotope HDO through a set of laser heterodyne device whose central wavelength is located in the water vapor isotope HDO(1 553 cm^(-1)). The field atmospheric simulation and detection were carried out in Hefei Science Island area. The laser heterodyne spectral signal of water isotope HDO molecules was obtained in the near-infrared band(6 437~6 441cm^(-1)). The laser heterodyne
作者
刘笑海
薛正跃
李竣
王贵师
刘锟
高晓明
谈图
LIU Xiaohai;XUE Zhengyue;LI Jun;WANG Guishi;LIU Kun;GAO Xiaoming;TAN Tu(Anhui Institute of Optics and Precision Machinery,Hefei Institute of Material Sciences,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China)
出处
《光子学报》
EI
CAS
CSCD
北大核心
2022年第4期201-208,共8页
Acta Photonica Sinica
基金
国家自然科学基金重点项目(No.41730103)
国家自然科学基金青年基金(No.41805018)
国家重点研发计划(No.2017YFC0209705)。
关键词
激光外差
水汽
同位素
HDO
信噪比
光谱分辨率
大气透过率谱
垂直廓线
Laser heterodyne
Water vapour
Isotopes
HDO
Signal to noise ratio
Spectral resolution
Atmospheric transmittance spectrum
Vertical profile
