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中文摘要：
分析了Al2O3粒子在喷焰内流动冷却过程中不同相态对其光学性质的影响，重点研究凝固过程中三种相态（液态、γ相、α）Al2O3粒子的吸收指数随相态的变化关系，考虑了紫外到近红外光谱范围内，Al2O3粒子的不同辐射机制．基于Drude模型所得到的氧化铝粒子不同相态吸收指数的计算模型建立了描述Al2O3粒子相变过程紫外与可见光辐射特性数学计算模型．通过与实验数据的对比分析表明，本模型是可行的．在此基础上，分析了不同相态Al2O3粒子辐射特性随温度和波长的变化关系．
英文摘要：
The effect of different phase states of Al2O3 particles on their optical properties was analyzed when the particles flowed and were cooled in exhaust plume. The influence of three phase states（ liquid,γ phase,α phase） on the image part of complex refractive index was particularly investigated in the solidification process. Different mechanisms which were responsible for the Al2O3 particles radiation were considered in the spectral range from ultraviolet to near infrared region. Based on the model for calculating absorption coefficient of Al2O3 particles in different phases deduced from Drude model, the model for calculating ultraviolet and visible radiative properties of particles with phase transition was built up. Calculation results show satisfactory agreement with experimental data. Based on the model, the influence of temperature and wavelength on radiactive properties during the phase transition of Al2O3 particles was analyzed too.
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