双色激光诱导炽光法结合光腔衰荡光谱技术测量碳烟颗粒的研究

Measurement of Soot Particles by Two-Color Laser-Induced Incandescence Method Combined with Cavity Ring-Down Spectroscopy

基于激光诱导炽光(LII)法和光腔衰荡光谱(CRDS)技术,搭建了用于研究火焰碳烟颗粒的测量平台,并对其性能参数进行了表征。碳烟颗粒路径积分衰减系数测量结果表明,双色LII测试系统和CRDS系统相互独立。同时运行双色LII和CRDS系统,测量得到的路径积分衰减系数随着火焰高度的增加先增大后减小,两个系统的测量结果具有较好的相关性。通过优化拟合模型及去除系统噪音,获得了较好的光腔衰荡信号拟合结果。

Based on laser-induced incandescence(LII)and cavity ring-down spectroscopy(CRDS),we establish a measurement setup for the study of flame soot particles,and characterize the performance parameters.The measurement results of the path-integrated attenuation coefficient of soot particles show that the two-color LII test system and the CRDS system are independent of each other.When the two-color LII and CRDS systems are opened at the same time,the measured path-integrated attenuation coefficient increases first and then decreases with the increase of the height above the burner,and the measurement results of the two systems have good correlation.By optimizing the fitting model and removing the system noise,we obtain a better cavity ring-down signal fitting results.