UNCERTAINTY ANALYSIS OF CO2 GAS MEASUREMENT IN TDLAS SYSTEM
Tunable Diode Laser Absorption Spectroscopy(TDLAS)is one of the most common methods for gas detection at present,which is characterized by high sensitivity,high resolution and fast response.This paper experimence with different concentrations of CO2 in the range of 0.3%-2%,and study the characteristics of the second harmonic signal of CO2 absorption.The mathematical model of the second harmonic signal and the corresponding concentration was obtained and the linear fitting results showed that r = 0.99765.Then the concentration of CO2 is inversely calculated and the inversion result of linear fitting is close to the true value.The six uncertainties sources of TDLAS measurement system are analyzed emphatically,and the uncertainty components are calculated one by one.Finally,the uncertainty of the measurement system is analyzed and evaluated,deriving the extended uncertainty of the system U equals 0.6366,which shows the suspicious degree of the correctness of the measurement results quantitatively.It is of great reference significance to the measurement of trace gas components in the atmosphere and uncertainty evaluation.
Tunablediode absorption spectroscopy Wavelength modulation Second harmonic Uncertainty
H.L.Li S.Zhang F.C.Li R.X.Zhang C.Li L.D.Fang X.T.Li
College of Quality and Technical Supervision of Hebei University,Baoding,China;Hebei Provincial Engi College of Quality and Technical Supervision of Hebei University,Baoding,China College of Physics Science and Technology of Hebei University,Baoding,China
国际会议
国际测量技术联合会(IMEKO)2017年国际测量技术研讨会
杭州
英文
94-99
2017-09-04（万方平台首次上网日期，不代表论文的发表时间）