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光腔衰荡光谱技术(Cavity Ring Down Spectroscopy,CRDS)是一种高灵敏度的吸收光谱测量技术,在燃烧场激光光谱诊断领域里是一种十分重要的燃烧产物定量测量手段。文中研究了光腔衰荡光谱技术用于燃烧产物定量测量的原理,搭建了脉冲型光腔衰荡光谱技术实验系统,选取OHA2Σ+-X2Π(0,0)电子跃迁带的P1(2)吸收线谱,在常压条件下对平面火焰的OH浓度进行了定量测量,并对激光器线宽及线型、激光器的频率稳定性、火焰温度、光腔参数等因素对测量误差的影响进行了分析讨论。误差分析给出了光腔衰荡光谱技术的几个关键注意事项,可为光腔衰荡光谱技术的应用提供指南。
Cavity Ring Down Spectroscopy (CRDS) is a highly sensitive absorption spectroscopy technique and is a very important quantitative measure of combustion products in the field of laser spectroscopy of combustion field. In this paper, the principle of cavity ring-down spectroscopy for the quantitative measurement of combustion products was studied. The experimental system of pulse-shaped cavity ring-down spectroscopy was set up and P1 (2) absorption of OHA2Σ + -X2Π (0,0) Line spectrum, the OH concentration of planar flame was measured under atmospheric pressure, and the influence of laser linewidth and line type, laser frequency stability, flame temperature and cavity parameters on the measurement error was analyzed discuss. Error analysis gives a few key considerations for cavity ring-down spectroscopy, providing guidance for the application of cavity ring-down spectroscopy.