IMECH-IR  > 高温气体动力学国家重点实验室
CO concentration measurements using tunable diode laser absorption spectroscopy behind the shock waves in Martian atmosphere
Lin X(林鑫)1,2; Li DC2; Li F(李飞)1; Yu XL(余西龙)1,3
Source PublicationProceedings of SPIE - The International Society for Optical Engineering
2019
Conference Name5th International Symposium on Laser Interaction with Matter, LIMIS 2018
Conference DateNovember 11, 2018 - November 13, 2018
Conference PlaceChangsha, China
Abstract

Shock tube experiments are carried out to study the physical and chemical processes during a vehicle entry into the Mars atmosphere using tunable diode laser absorption spectroscopy (TDLAS) and optical emission spectroscopy (OES). CO concentration distributions are diagnosed behind a shock wave in a CO2-N2mixture with three different conditions of initial pressure and velocity. The strong shock wave is established in a shock tube driven by combustion of hydrogen and oxygen. Time-resolved spectra of the Δv = 0 sequence of the B2Σ+ →X2Σ+ electronic transition of CN have been observed through OES. A precise analysis of the CN violet spectra is performed and used to determine rotational and vibrational temperatures. Two absorption lines in the first overtone band of CO near 2.33 μm, are selected from a HITRAN simulation to calibrate laser wavelength and detect the CO concentration. Combined with these temperature results using OES, CO concentrations in the thermal equilibrium region are derived, which are 2.91 × 1017 cm-3, 7.46 × 1017 cm-3 and 1.01 × 1018 cm-3, corresponding to equilibrium temperatures equal to 7000 ± 400 K, 7400 ± 300 K, 6000 ± 300 K in the low, medium and high pressure conditions, respectively.
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Indexed ByEI
Language英语
Document Type会议论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/80036
Collection高温气体动力学国家重点实验室
Affiliation1.State Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing; 100190, China
2.School of Engineering Science, University of Chinese Academy of Sciences, Beijing; 100049, China
3.China Academy of Aerospace Aerodynamics, Beijing; 100074, China
Recommended Citation
GB/T 7714
Lin X,Li DC,Li F,et al. CO concentration measurements using tunable diode laser absorption spectroscopy behind the shock waves in Martian atmosphere[C],2019.
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