Combined TDLAS and OES technique for CO concentration measurement in shock-heated Martian atmosphere

Xin Lin; Xilong Yu; Fei Li; Shaohua Zhang; Jianguo Xin; Xinyu Chang

doi:10.1117/12.2011292

16 May 2013 Combined TDLAS and OES technique for CO concentration measurement in shock-heated Martian atmosphere

Xin Lin, Xilong Yu, Fei Li, Shaohua Zhang, Jianguo Xin, Xinyu Chang

Proceedings Volume 8796, 2nd International Symposium on Laser Interaction with Matter (LIMIS 2012); 87961J (2013) https://doi.org/10.1117/12.2011292
Event: 2nd International Symposium on Laser Interaction with Matter (LIMIS 2012), 2012, Xi'an, Shaanxi, China

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%.

Citation Download Citation

Xin Lin, Xilong Yu, Fei Li, Shaohua Zhang, Jianguo Xin, and Xinyu Chang "Combined TDLAS and OES technique for CO concentration measurement in shock-heated Martian atmosphere", Proc. SPIE 8796, 2nd International Symposium on Laser Interaction with Matter (LIMIS 2012), 87961J (16 May 2013); https://doi.org/10.1117/12.2011292

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