CO2高温光谱参数测量系统设计与实验
投稿时间:2018-05-23  修订日期:2018-07-09  点此下载全文
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作者单位E-mail
陈玖英 中国科学院定量遥感信息技术重点实验室,中国科学院光电研究院 jychen@aoe.ac.cn 
周梅 中国科学院定量遥感信息技术重点实验室,中国科学院光电研究院  
刘建国 中国科学院安徽光学精密机械研究所,中国科学院环境光学与技术重点实验室  
阚瑞峰 中国科学院安徽光学精密机械研究所,中国科学院环境光学与技术重点实验室  
李传荣 中国科学院定量遥感信息技术重点实验室,中国科学院光电研究院 crli@aoe.ac.cn 
基金项目:中国科学院国际合作局对外合作重点项目(批准号:181811KYSB20160113);国家重大科学仪器设备开发专项(批准号:2014YQ060537)。
中文摘要:CO2和CO被称为燃烧效率指示性气体,燃烧流场中CO2的精确测量对工业燃烧过程的节能减排和发动机燃烧状态诊断等都具有重要意义。研究CO2气体的高温光谱参数,包括:线强、自加宽系数、温度依赖系数,可提高燃烧过程中CO2浓度的测量精度和可靠性。为了获得可用于燃烧诊断的CO2吸收线的高温光谱参数,基于可调谐半导体激光吸收光谱技术设计了一套最高温度可达2073K的精确控温控压气体光谱参数测量系统。采用该系统开展了CO2 R(50e)吸收线(中心频率为5007.787cm-1)的高温光谱测量实验,获得了温度范围1212K~1873K内多个压强下的纯CO2气体的大量高温吸收光谱,经热辐射背景扣除、基线拟合、时频转换、多线组合非线性最小二乘法拟合等数据处理过程,得到温度范围1212K~1873K内CO2 R(50e)吸收线的线强、自加宽系数及温度系数,其中线强不确定度<1.5%,自加宽系数不确定度小于4.5%。这些参数是对现有数据库的补充和完善,对燃烧诊断中的CO2浓度检测有很大帮助,能够满足燃烧过程中CO2浓度精确反演的需求。
中文关键词:可调谐半导体激光吸收光谱  高温光谱  线强  自加宽系数  温度系数
 
Design and experiment of CO2 high temperature spectrum parameter measurement system
Abstract:CO2 and CO are called the key indicators of combustion efficiency. Accurate measurement of CO2 in the combustion flow field is very important for energy conservation and emission reduction in industrial combustion process and engine combustion state diagnosis. Researching intensity, self-broadening coefficient, temperature-dependence exponent and other parameters of CO2 in high temperature, may improve the accuracy and reliability of measurements for CO2 concentration. A precise temperature control and pressure control gas spectroscopic parameter measurement system with a design temperature up to 2073K based on absorption spectroscopy has been developed for the measurement of spectroscopic parameters of the R(50e) line at 5007.787cm-1 of CO2. A large number of high temperature survey spectra of the CO2 R(50e) line were recorded at temperatures between 1212K and 1873K and many pressures through the system. Through background subtraction, baseline fitting, time-frequency conversion, multi-line combination and nonlinear least squares fitting, and other data processing based on the CO2 R(50e) survey spectra, intensity, self-broadening full-width and temperature-dependence exponent at temperatures between 1212K and 1873K were obtained. The uncertainty of line strength is less than 1.5%, the uncertainty of self-broadening full-width is less than 4.5%. These parameters are supplement and improvement to the existing database. They are helpful for the detection of CO2 concentration in combustion diagnosis to ensure the accurate inversion of CO2 concentration in the combustion process.
keywords:tunable diode laser absorption spectroscopy (TDLAS)  high-temperature spectrum  intensity  self-broadening full-width  temperature-dependence exponent
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