We establish a single diode laser sensor system to obtain temperature and water concentration in CH<sub>4</sub>/air premixed flame. Line-of-sight properties are analyzed, but line-of-sight results are not path average values for temperature measurements. The measurements are performed on a flat burner based on scannedwavelength direct absorption spectroscopy using two adjacent water lines at 7153.75 and 7154.35 cm<sup>-1</sup>. Real-time results are acquired using a data acquisition card with a Labview data processing program. The standard uncertainties of the temperature and water concentration measurements are 2.3% and 5.1%, respectively.
© 2010 Chinese Optics Letters
Bo Tao, Xisheng Ye, Zhiyun Hu, Lirong Zhang, and Jingru Liu, "On-line measurement of temperature and water vapor in CH4/air premixed flame using near-infrared diode laser," Chin. Opt. Lett. 8, 1098-1101 (2010)