基于离轴积分腔输出光谱技术的二氧化碳测量  

Carbon Dioxide Measurement Based on Off-axis Integrated Cavity Output Spectroscopy Technology

作　　者：卢俊城 高璐 吴琼[1] 刘雯 梁荫杰 陈达如 邵杰[1] LU Juncheng;GAO Lu;WU Qiong;LIU Wen;LIANG Yinjie;CHEN Daru;SHAO Jie(Institute of Optical Information,College of Physics and Electronic Information Engineering,Zhejiang Normal University,Jinhua 321004,China;Hangzhou Institute of Advanced Studies,Zhejiang Normal University,Hangzhou 311200,China)

机构地区：[1]浙江师范大学物理与电子信息工程学院信息光学研究所,金华321004 [2]浙江师范大学杭州高等研究院,杭州311200

出　　处：《光子学报》2024年第8期122-129,共8页Acta Photonica Sinica

基　　金：国家自然科学基金(No.61775797);浙江省重点研发计划(No.2022C03066);金华市重点科技攻关项目(No.20213032)。

摘　　要：利用1.573μm的分布反馈式二极管激光器作为光源,搭建了一套基于离轴积分腔输出光谱(ICOS)的二氧化碳(CO_(2))气体检测装置。选取CO_(2)在6358.65 cm^(-1)处,线强为1.732×10^(-2)3cm^(-1)/(molecule·cm^(-2))的吸收谱线,测量了密封腔体内400×10^(-6)的CO_(2)直接吸收信号。实验结果表明在镜片反射率为99.98%和60 cm腔长内,实现了2.4 km的有效光程,系统的线性度为0.996。通过长时间测量密封腔体内的CO_(2)直接吸收信号,根据Allan曲线分析得到系统最佳积分时间为98.3 s,最小可探测极限为0.63×10^(-6)。最后,实验室环境测试实验结果表明室内CO_(2)浓度值变化符合实验室人员活动作息规律,验证了测量装置的可靠性和稳定性,同时为室内CO_(2)排放管理提供实用的科学依据。Carbon dioxide(CO_(2))accounts for about 0.04%of the atmospheric composition and is one of the major greenhouse gases.With the development of industrial society,anthropogenic CO_(2)emissions are increasing every year,which undoubtedly aggravates global warming.Therefore,it is of great significance to monitor the CO_(2)concentration in the atmosphere to manage the CO_(2)emission scientifically.In this paper,a simple atmospheric CO_(2)gas detection equipment based on Off-axis Integrated Cavity Output Spectroscopy(OA-ICOS)was constructed using a 1.573μm distributed feedback diode laser.Firstly,the CO_(2)detection system was built and optimized.In this paper,the absorption spectrum of CO_(2)at 6358.65 cm^(-1)with a line intensity of 1.732×10^(-2)3 cm^(-1)/(molecule·cm^(-2))is selected,and then the CO_(2)direct absorption signal of 400×10^(-6)i n t he s ealed c avity i s m easured,and the experimental results show that an effective optical range of about 2.4 km is realized in the lens reflectivity of 99.98%and 60 cm cavity length.There is a large amount of residual cavity mode noise in the transmission signal acquired in a single time,and the system noise can be reduced by averaging calculation.The experimental results show that the optimal value of the averaging number is at 1000 times,and at this averaging time,the relative error of the absorbing area is averaged at 7.67×10^(-3)and the STD is 5.87×10^(-3).Second,the performance of the CO_(2)detection system was analyzed.By measuring CO_(2)gas from 400 to 2000×10^(-6)with an interval of 200×10^(-6),the linearity of the OA-ICOS system was obtained to be 0.996,and the maximum value of the STD of the absorbed area at each volume fraction was 3.23×10^(-3)(1200×10^(-6))and the minimum was 2.34×10^(-3)(1800×10^(-6)).By measuring the CO_(2)direct absorption signal in the sealed chamber for a long time,the optimal integration time of the system was obtained from the Allan curve analysis to be 98.3 s,and the minimum detectable limit was 0.63×10^(-6).The system re

关 键 词：离轴积分腔输出光谱 直接吸收 气体检测 二氧化碳 红外吸收光谱 

分 类 号：O433.4[机械工程—光学工程]