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采用宽带相干反斯托克斯拉曼散射 (CARS)技术测量了甲烷 空气预混火焰温度场分布 ,并分析了温度测量的不确定度。建立的宽带CARS实验系统采用非稳腔空间增强探测 (USED)相位匹配构造 ,其横向空间分辨率约0 1mm ,纵向空间分辨率约 3mm ,该系统能实现 10Hz重复频率测量火焰瞬时温度。采用宽带非稳腔空间增强探测CARS在甲烷 空气预混火焰中获得了单次激光脉冲的高信噪比氮气Q支CARS实验谱 ,用CARS理论计算软件拟合理论谱和实验谱确定了预混火焰的温度随高度的分布 ,采用单次激光脉冲的氮气Q支CARS实验谱测量火焰温度的不确定度小于 5 %。
The temperature field distribution of methane air premixed flame was measured by broadband coherent anti-Stokes Raman scattering (CARS) technique and the uncertainty of temperature measurement was analyzed. The established wideband CARS experimental system uses the USED phase matching structure with a stable spatial resolution of about 0 1 mm and a longitudinal spatial resolution of about 3 mm. This system can measure the instantaneous flame temperature at 10 Hz repetition rate. The CARS experimental spectrum with high signal-to-noise ratio of nitrogen and nitrogen of a single laser pulse was obtained by CARS with the wide-band unstable cavity space enhancement detection CARS. The theoretical and experimental spectra of CARS calculation software were used to confirm the premix The flame temperature distribution with height, using a single laser pulse nitrogen Q-CARS experimental spectrum to measure the flame temperature uncertainty of less than 5%.