2nd International Symposium on Laser Interaction with Matter (LIMIS)
SEP 09-12, 2012
Xian, PEOPLES R CHINA
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 (B-2 Sigma(+)-> X-2 Sigma(+), Delta 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 x 10(12) cm(-3) with the average temperature of 7400 K ± 300 K, which corresponds to the center fractional absorption of 2.7%.
Lin X,Yu XL,Li F,et al. Combined TDLAS and OES technique for CO concentration measurement in shock-heated Martian atmosphere[C]2ND INTERNATIONAL SYMPOSIUM ON LASER INTERACTION WITH MATTER (LIMIS 2012),2013:87961J.