title: [Study of high temperature water vapor concentration measurement method based on absorption spectroscopy].
abstract: Tunable diode laser absorption spectroscopy (TDLAS) has been developed to realize the real-time and dynamic measurement of the combustion temperature, gas component concentration, velocity and other flow parameters, owing to its high sensitivity, fast time response, non-invasive character and robust nature. In order to obtain accurate water vapor concentration at high temperature, several absorption spectra of water vapor near 1.39 μm from 773 to 1273 K under ordinary pressure were recorded in a high temperature experiment setup using a narrow band diode laser. The absorbance of high temperature absorption spectra was calculated by combined multi-line nonlinear least squares fitting method. Two water vapor absorption lines near 7154.35 and 7157.73 cm(-1) were selected for measurement of water vapor at high temperature. A model method for high temperature water vapor concentration was first proposed. Water vapor concentration from the model method at high temperature is in accordance with theoretical reasoning, concentration measurement standard error is less than 0.2%, and the relative error is less than 6%. The feasibility of this measuring method is verified by experiment.
authors.forename: Jiu-ying
authors.initials: JY
authors.lastname: Chen
authors.forename: Jian-guo
authors.initials: JG
authors.lastname: Liu
authors.forename: Jun-feng
authors.initials: JF
authors.lastname: He
authors.forename: Ya-bai
authors.initials: YB
authors.lastname: He
authors.forename: Guang-le
authors.initials: GL
authors.lastname: Zhang
authors.forename: Zhen-yu
authors.initials: ZY
authors.lastname: Xu
authors.forename: Qiang
authors.initials: Q
authors.lastname: Gang
authors.forename: Liao
authors.initials: L
authors.lastname: Wang
authors.forename: Lu
authors.initials: L
authors.lastname: Yao
authors.forename: Song
authors.initials: S
authors.lastname: Yuan
authors.forename: Jun
authors.initials: J
authors.lastname: Ruan
authors.forename: Yun-hai
authors.initials: YH
authors.lastname: Dai
authors.forename: Rui-feng
authors.initials: RF
authors.lastname: Kan