Design and experiment of CO2 high temperature spectrum parameter measurement system
Received:May 23, 2018  Revised:July 09, 2018  download
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Author NameAffiliationE-mail
CHEN Jiu-Ying Key Laboratory of Quantitative Remote Sensing Information Technology, Academy of Opto-electronics, Chinese Academy of Sciences jychen@aoe.ac.cn 
ZHOU Mei Key Laboratory of Quantitative Remote Sensing Information Technology, Academy of Opto-electronics, Chinese Academy of Sciences  
LIU Jian-Guo Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences  
KAN Rui-Feng Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences  
LI Chuan-Rong Key Laboratory of Quantitative Remote Sensing Information Technology, Academy of Opto-electronics, Chinese Academy of Sciences crli@aoe.ac.cn 
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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