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介绍了自发喇曼散射技术的基本原理、实验方法及对高压燃烧场的测量结果。利用Nd:YAG激光的三倍频输出激发振动喇曼散射,在单脉冲条件下测量了高压模拟燃烧室内不同化学配比条件下以氢气-空气预混燃烧场为主要组分(N2,O2,H2O,H2等)的喇曼光谱,获得了主要组分浓度随燃烧时间、燃烧场压力的变化规律。实验中利用偏振技术有效地提高了信噪比。通过优化激光光束形状及光路设计避免了等离子体光谱对喇曼信号的干扰。
The basic principle of spontaneous Raman scattering, experimental methods and measurement results of high pressure combustion field are introduced. The vibrational Raman scattering was excited by the triple frequency output of Nd: YAG laser. Under the condition of single pulse, the premixed combustion field of hydrogen and air was taken as the main component under different chemical stoichiometry of high pressure simulated combustion chamber (N2, O2, H2O, H2, etc.) Raman spectra of the main components with the combustion time, the pressure change of the combustion field. In the experiment, the use of polarization technology effectively improves the signal to noise ratio. By optimizing the shape of the laser beam and the optical path design, the interference of the plasma spectrum to the Raman signal is avoided.