基于氧气A带吸收线的被动式对流层风场探测关键参数分析  

Analysis of Key Parameters of Passive Tropospheric Wind Field Detection Based on Oxygen A-band Absorption Line

作　　者：刘欢[1,2] 冯玉涛 傅頔[1,2] 赵珩翔 孔亮 郝雄波[1] 畅晨光 韩斌 王素凤 LIU Huan;FENG Yutao;FU Di;ZHAO Hengxiang;KONG Liang;HAO Xiongbo;CHANG Chenguang;HAN Bin;WANG Sufeng(Key Laboratory of Spectral Imaging Technology,Xi′an Institute of Optics Precision Mechanic of Chinese Academy of Sciences,Xi′an 710119,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院西安光学精密机械研究所光谱成像技术重点实验室,西安710119 [2]中国科学院大学,北京100049

出　　处：《光子学报》2023年第12期151-162,共12页Acta Photonica Sinica

基　　金：国家自然科学基金(No.41005019);中国科学院西部青年学者(No.XAB 2016A07);中国科学院西部之光交叉团队(No.E1294301);中国科学院科研仪器设备研制项目(No.YJKYYQ20210021);陕西省自然科学基础研究计划(No.2019JQ-931)。

摘　　要：为了探索基于氧气A带吸收谱线利用多普勒差分干涉仪实现对流层大气风场探测的技术可行性,建立了从大气吸收谱线入瞳临边辐射到干涉曲线的仪器响应函数数理模型,仿真分析干涉仪光学参数、滤光片参数、系统噪声、仪器稳定性和标准具离轴效应等对视线风速反演结果的影响,确定光学系统参数的最优取值范围。结果表明,对中心波长位于769 nm的氧气吸收线,当干涉仪非对称量取值6.5~6.7 mm,光谱分辨率取值0.49~0.51 cm^(-1),带通滤光片半波带宽取值0.12~0.21 nm,标准具间距取值0.8~1.4 mm,精细度系数取值30~100,标准具离轴角小于0.2°,标准具透射峰偏移小于0.018 cm^(-1),干涉图信噪比大于40倍时,风速反演精度优于8 m/s,研究结果可为被动式对流层风场探测以及相关仪器设计提供理论参考。Real-time and high-precision wind field data play an important role in improving the accuracy of weather forecasts,ensuring the safety of spacecraft take-off and landing,tracking atmospheric pollutants,and radio sound detection.In the visible light and near-infrared bands,there are three absorption bands formed by the absorption of oxygen molecules,namely the oxygenγband,the oxygen B band and the oxygen A band.The absorption intensity of the A band is greater than that of theγband and the B band,and without interference from other gases,it is an ideal atmospheric detection source for tropospheric wind speed.The Doppler asymmetric spatial heterodyne wind measurement technology is a technology based on the Fourier transform of the interferogram to realize the Doppler frequency shift detection of the wind,the tropospheric wind velocity can be retrieved by detecting the Doppler shift of the oxygen A-band absorption line.This paper explores the technical feasibility of using Doppler asymmetric spatial heterodyne to detect the tropospheric atmospheric wind field based on the oxygen A-band absorption line.Based on the ideal instrument model and the 1976 American standard profile,the solar zenith angle is taken as 40°,without considering the influence of clouds,rain,aerosol,and surface reflection.Through the analysis of the integral limb radiation characteristics of the absorption spectrum line observed in the single instantaneous field of view at the entrance pupil of the instrument,the paper simulates the forward simulation interference curve of a single space altitude layer,establishes a mathematical model of the instrument response function from the atmospheric absorption spectral line entrance pupil limb radiation to the interference curve,and two harmonics with the same spatial frequency as the interference curve are used for phase demodulation and wind speed inversion of line-of-sight wind.This method does not require Fourier transform,and can directly process the interferogram data to obtain the phase differen

关 键 词：对流层风场 遥感探测 氧气A吸收带 多普勒差分干涉仪 风速反演 

分 类 号：TH744[机械工程—光学工程]