摘要
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 principle of spontaneous vibrational Raman scattering（SVRS） is introduced. Raman scattering is produced by Nd： YAG laser in a high-pressure hydrogen-air combustion. Raman spectra are recorded for lean, stichiometric, and rich flames. Concentrations of major species （N2,O2, H2O, H2 ） are measured in flames at different time. The concentration changes with the pressure of combustion at different time is analysed. Polarization technique is used for impove the ratio of signal-to-noise, and the laser beam shape is optimized to avoid the plasma spectral interference.
出处
《光学技术》
CAS
CSCD
北大核心
2009年第2期272-275,共4页
Optical Technique
关键词
燃烧诊断
喇曼散射
组分
高压
单脉冲
combustion diagnostics
Raman scattering
concentration
high-pressure
single-pulse
