A one-dimensional premixed ethylene–air flame is investigated regarding the presence of various combustion intermediates and products relevant for the formation of carbonaceous particles for various equivalence ratios and spatial positions using in situ UV–Vis absorption spectroscopy. A laser driven light source in combination with a fast spectrometer allow to record absorption spectra at a high rate required for practical combustion devices. The approach is coupled with a least squares regression procedure using a database of several absorbing species in the flame. To account for the high temperature flame conditions, the absorption spectra are convoluted by a simplified Maxwell–Boltzmann distribution model. While the approach is based on several assumptions and a verification requires future detailed intercomparison with other techniques, a first semi-quantitative evaluation can be obtained. This novel approach opens a potential route to the in situ measurement of the evolution of polycyclic aromatic hydrocarbons (PAHs) in flames.

使用原位 UV-Vis 吸收光谱研究了一维预混乙烯-空气火焰中各种燃烧中间体和产物的存在，这些中间体和产物与各种当量比和空间位置的碳质颗粒的形成有关。激光驱动光源与快速光谱仪相结合，可以以实际燃烧设备所需的高速率记录吸收光谱。该方法与使用火焰中几种吸收物质的数据库的最小二乘回归程序相结合。为了说明高温火焰条件，吸收光谱通过简化的麦克斯韦-玻尔兹曼分布模型进行了卷积。虽然该方法基于若干假设并且验证需要未来与其他技术的详细比对，可以获得第一次半定量评价。这种新方法为原位测量火焰中多环芳烃 (PAH) 的演变开辟了一条潜在途径。