Abstract
As an effective optical diagnosis method, tunable diode-laser absorption spectroscopy (TDLAS) has increasingly moved to examine nonuniform flows, such as two-dimensional combustion diagnosis. To investigate the effect of nonuniformity along the line of sight in a measurement using TDLAS, the integrated absorbance (IA, the key intermediate quantity in TDLAS) error was quantified. The error distribution is obtained from the line-shape parameters through the comprehensive analysis of the line-shape function and the fitting method. The effects of the fitting function and the absorption line overlap are also considered. A general method for estimating the error is given. The work illustrates the applicability of TDLAS technology in nonuniform flow fields and provides input parameters for the evaluation of tunable diode laser absorption tomography error.
Highlights
Tunable diode laser absorption spectroscopy (TDLAS) technology has a long history of use in the high-temporal-resolution, noninvasive, and quantitative measurements of the gas temperature, pressure, and composition in many practical, near-homogenous environments [1,2]
This combination has resulted in the tunable diode laser absorption tomography (TDLAT) method
For the convenience of analysis, the absolute value of integrated absorbance (IA) error is used in the analysis
Summary
Tunable diode laser absorption spectroscopy (TDLAS) technology has a long history of use in the high-temporal-resolution, noninvasive, and quantitative measurements of the gas temperature, pressure, and composition in many practical, near-homogenous environments (e.g., environments of the atmosphere, shock tubes, scramjets, and internal-combustion engines) [1,2]. Efforts in the first category improve the TDLAS to obtain the parameter distribution information along the optical path [6,7,8]. Efforts in the second category obtain the spatial resolution by combining. This combination has resulted in the tunable diode laser absorption tomography (TDLAT) method. This method is mainly applied to combustion and reaction flow and is a two-dimensional measurement technique with great potential [9,10,11,12,13,14,15,16]
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