基于激光掩星吸收光谱的二氧化碳探测技术  

Carbon dioxide detection technology based on the laser occultation absorption spectrum

作　　者：王玉诏[1,2] 陶宇亮 孙海青[1,2] 杨超 WANG Yu-Zhao;TAO Yu-Liang;SUN Hai-Qing;YANG Chao(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China;Key Laboratory fOr Space Laser Information Perception Technology of CAST,Beijing 100094,China)

机构地区：[1]北京空间机电研究所,北京100094 [2]中国空间技术研究院空间激光信息感知技术核心专业实验室,北京100094

出　　处：《中国光学》2021年第3期634-642,共9页Chinese Optics

基　　金：民用航天十三五预研项目资助(No.D040105)。

摘　　要：本文分析了固定波长激光掩星差分吸收技术的优点和不足,介绍了可调谐激光直接吸收光谱技术测量原理。分析了最优波长透过率与信噪比的关系以及测量误差与背景光干扰的关系。根据高灵敏度探测器的工作波长范围,选择了6 310.915 cm^(-1)、6 310.893 cm^(-1)、6 310.890 cm^(-1)、6 310.883 4 cm^(-1)作为吸收的工作波长,同时选择6 310.15 cm^(-1)作为参考波长,并对各波长的探测能力进行了仿真分析。通过仿真结果可知,在1 km垂直分辨率下,在5~35 km内CO_(2)浓度探测误差优于0.9%,7~42 km范围内的探测误差优于0.4%。该技术降低了系统成本和复杂度,有利于星载产品的设计和实现。The advantages and disadvantages of fixed-wavelength laser occultation differential absorption technology are analyzed,and the measurement principle of tunable laser direct absorption spectroscopy technology is introduced.The relationship between optimal wavelength transmittance and signal-to-noise ratio and the relationship between measurement error and background light interference are analyzed.According to the working wavelength range of the high-sensitivity detector,6310.915 cm^(-1),6310.893 cm^(-1),6310.890 cm^(-1) and 6310.8834 cm^(-1) are selected as the absorption working wavelengths,and 6310.15 cm^(-1) is selected as the reference wavelength,and the detection ability of each wavelength is simulated and analyzed.Simulation results show that the detection error of a CO2 concentration is better than 0.9%in the range of 5~35 km and better than 0.4%in the range of 7~42 km with a vertical resolution of 1 km.This technology reduces the cost and complexity of the system,and is beneficial to the design and implementation of spaceborne products.

关 键 词：激光掩星 二氧化碳 直接吸收光谱 

分 类 号：P407.5[天文地球—大气科学及气象学] P412.27