中文摘要：

本文考虑透射法测量中窗片间的多重反射及入射光束收敛角度的影响，通过透射法测量窗片一液体一窗片三层结构的总透射比，并结合K—K关系式建立了液态碳氢燃料的热辐射特性光谱参数测量反演方法。采用该方法，对蒸馏水的热辐射光谱特性参数进行测量反演，通过与蒸馏水的公开数据对比，验证了该方法可靠性与准确性。在此基础上，对某国产柴油300--~400K温度范围内近红外波段的热辐射特性参数进行了测量及反演计算，获得了不同温度下近红外波段的光谱吸收指数及折射率。测量反演结果显示，在测量光谱区间该柴油折射率随温度变化不明显，但吸收指数随温度升高而减小且变化剧烈，不同温度下的吸收指数相对变化率可达20％。

英文摘要：

Considering the multi-reflection between two windows and the convergence angle of inci- dent beam, this paper measured total transmittance of window-liquid-window three-layer structure via transmission method, and built retrieval method for the thermal radiation properties of liquid hydrocarbon fuels combined with Kramers-Kronig relations. The thermal radiation property parame- ters of distilled water were calculated using this method. By comparison between calculated results of distilled water and published data in reference, this method was verified to be reliable and accurate. Then the thermal radiation property parameters of the domestic diesel were measured and calculated in the infra-red band between 300 and 400 K, and the absorption index and refractive index were obtained. Results indicate that refractive index varies unobvious in the researched band while absorp- tion index decreases obviously with temperature increment, whose relative rate of change can reach to 20%.