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Proceedings Paper

Combined TDLAS and OES technique for CO concentration measurement in shock-heated Martian atmosphere
Author(s): Xin Lin; Xilong Yu; Fei Li; Shaohua Zhang; Jianguo Xin; Xinyu Chang
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Paper Abstract

This paper describes the CO concentration and gas temperature distribution measurements behind a strong shock wave in the simulated Martian atmosphere by an optical diagnostic system. The strong shock wave (6.31 ± 0.11 km/s) is established in a shock tube driven by combustion of hydrogen and oxygen. The optical diagnostic system consists of two parts: the optical emission spectroscopy (OES) system and the tunable diode laser absorption spectroscopy (TDLAS) system. For OES system, high temporal and spatial resolution experimental spectra of CN violet system (B2Σ+→X2Σ+, v = 0 sequence) have been observed. Rotational and vibrational temperature distribution along the shock wave is inferred through a precise analysis of high-resolution experimental spectra. For TDLAS system, a CO absorption line near 2335.778 nm is utilized for detecting the CO concentration using scanned-wavelength direct absorption mode. Combined with these experimental results using OES, CO concentration in the thermal equilibrium region is derived. The detected average CO concentration is 7.46 × 1012 cm-3 with the average temperature of 7400 K ± 300 K, which corresponds to the center fractional absorption of 2.7%.

Paper Details

Date Published: 16 May 2013
PDF: 8 pages
Proc. SPIE 8796, 2nd International Symposium on Laser Interaction with Matter (LIMIS 2012), 87961J (16 May 2013); doi: 10.1117/12.2011292
Show Author Affiliations
Xin Lin, Beijing Institute of Technology (China)
Institute of Mechanics (China)
Xilong Yu, Institute of Mechanics (China)
Fei Li, Institute of Mechanics (China)
Shaohua Zhang, Institute of Mechanics (China)
Jianguo Xin, Beijing Institute of Technology (China)
Xinyu Chang, Institute of Mechanics (China)

Published in SPIE Proceedings Vol. 8796:
2nd International Symposium on Laser Interaction with Matter (LIMIS 2012)
Stefan Kaierle; Jingru Liu; Jianlin Cao, Editor(s)

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