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Proceedings Paper

Measurements of CO concentration distribution for Mars atmospheric entry by combining OES and TDLAS
Author(s): Xin Lin; Lianzhong Chen; Dongbin Ou; Fei Li; Xilong Yu
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Paper Abstract

Shock tube experiments are carried out to study the physical and chemical processes during a vehicle entry into the Mars atmosphere using optical emission spectroscopy (OES) and tunable diode laser absorption spectroscopy (TDLAS). Gas temperature and CO concentration distribution are diagnosed behind a shock wave in a CO2-N2 mixture with two 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 × 1012 cm-3 and 1.01 × 1013 cm-3, corresponding to equilibrium temperatures equal to 7000 ± 400 K and 6000 ± 300 K in low and high pressure conditions, respectively.

Paper Details

Date Published: 4 May 2015
PDF: 9 pages
Proc. SPIE 9543, Third International Symposium on Laser Interaction with Matter, 954314 (4 May 2015); doi: 10.1117/12.2180592
Show Author Affiliations
Xin Lin, China Academy of Aerospace Aerodynamics (China)
State Key Lab. of High Temperature Gas Dynamics (China)
Lianzhong Chen, China Academy of Aerospace Aerodynamics (China)
Dongbin Ou, China Academy of Aerospace Aerodynamics (China)
Fei Li, State Key Lab. of High Temperature Gas Dynamics (China)
Xilong Yu, State Key Lab. of High Temperature Gas Dynamics (China)


Published in SPIE Proceedings Vol. 9543:
Third International Symposium on Laser Interaction with Matter
Yury M. Andreev; Zunqi Lin; Xiaowu Ni; Xisheng Ye, Editor(s)

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