基于XeF (C-A)激光激励的自发拉曼散射技术研究

Research on Spontaneous Raman Scattering Excited by XeF(C-A) Laser

针对自发拉曼散射技术应用于实际燃烧场参数测量时面临的主要技术难题,采用XeF(C-A)激光作为激励光源,开展了自发拉曼散射技术实验研究。通过分析拉曼散射过程对光源参数的要求,优化了XeF(C-A)激光器部分参数,建立了自发拉曼散射诊断系统,实现了气体介质主要组分浓度在线测量,对比了XeF(C-A)激光与主流激光作为拉曼散射光源的优缺点。结果表明:与现有主流光源相比,具有脉冲能量大、微秒级脉宽,位于可见光波段等特点的放电抽运XeF(C-A)激光非常适合用作自发拉曼散射激励光源。

The main drawbacks of the spontaneous Raman scattering is its poor efficiency due to small Raman scattering cross sections and the interference with radiations from the laser when it is used to measurement actual combustion parameters. To overcome these drawbacks, XeF（C-A） laser is used as excited source in spontaneous Raman scattering research. Some parameters of the XeF（C-A） laser is optimized for adapt to the need of spontaneous Raman scattering. The experimental setup is built, which is used to measurement the mole fraction of components in the atmosphere. The advantages and disadvantages of spontaneous Raman scattering excited by different lasers are compared. The result shows that the XeF（C-A） laser with high energy, long pulse width and long wavelength is very fit to be used as spontaneous Raman scattering light source.