Studies of the Compositional and Temperature Effects on the Optical Properties of Flame Soot

摘要：本文的目的是研究化学成分、温度和/或微观结构对煤烟折射率的影响。拟议的研究包括地外和就地测量。在非原位研究中，颗粒将从预混丙烷/氧气和乙炔/氧气火焰中收集，并形成光滑的颗粒。将对这些颗粒进行碳/氢比分析，并通过椭偏测量确定其折射率，波长范围为0.30 - 10 mm，温度范围为25至2500℃。通过修正空隙效应，可以确定构成颗粒表面的粒子的折射率。对同一火焰进行现场研究，包括散射、消光和偏振测量，以获得颗粒直径、初级颗粒/团聚团数、团聚团数和初级颗粒的折射率。已知构型和折射率的聚合将被添加到CO/Air扩散火焰中，以测试实验和数据反演方法。通过这次调查，PI希望能够解释烟尘颗粒的非球形性，测试使用直链团聚体的原位研究方法，比较原位和非原位方法获得的折射率，并确定确定烟尘折射率的关键参数。

Abstract Charalampopoulos 9528598 The objectives of the proposed research is to study the effects of chemical composition, temperature and/or microstructure on the refractive indices of soot. The proposed studies involve both ex-situ and in-situ measurements. In the ex-situ studies particles will be collected from premixed propane/oxygen and acetylene/oxygen flames and formed into smooth pellets. These pellets will be analyzed for their carbon/hydrogen ratios and from ellipsometric measurements their refractive indices will be determined in the wavelength range 0.30 - 10 mm and for the temperature range 25 to 2500C. By correcting for voidage effects, the refractive indices of the particles which constitute the pellet surfaces will be determined. In-situ studies on the same flames, consisting of scattering, extinction and polarization measurements, will be used to obtain particle diameters, number of primary particles/agglomerate, number of agglomerates and the refractive indices of the primary particles. Aggregates of known configuration and refractive indices will be added to a CO/Air diffusion flame in order to test the experimental and data inversion approaches. Through this investigation the PI hopes to be able to account for the non-sphericity of the soot particles, test the methodology of the in-situ studies using straight-chain agglomerates, compare refractive indices obtained by the in-situ and ex-situ methods, and identify the critical parameters in determining soot refractive indices.