提出了一种基于填充柴油类半透明液体光学腔的透射光谱反演其介质光学常数的新方法(IDTM), 通过测量填充水光学腔的透射光谱并反演水的光学常数进行了方法验证。 采用Bruke V70傅里叶红外光谱仪实验测量了填充柴油光学腔在波长2~15 μm的透射光谱, 基于新方法反演得到柴油在部分波长区域的光学常数, 进而计算得到了其热辐射物性参数。 研究结果表明: (1)在波段为2.0~2.5 μm, 新方法(IDTM)反演水的光学常数同文献结果基本一致。 (2)IDTM反演液体光学常数精度同MCDTM基本一致, 且明显高于SODTM和SDTM。 (3)柴油在波长2~15 μm范围透光性能较差, 其中存在2.4, 3.4, 6.9, 7.3和13.8 μm等5个强吸收区域。 (4)柴油的光学常数和热辐射物性参数光谱选择性很强, 在不同波段其值差距较大。

A novel inversion method of optical constants of diesel fuel that is one of semitransparent liquid was developed based on spectral transmittance radio inversion calculation of optical cell with glass-liquid fuel-glass configuration, which was validated by measured the optical constants of water. The measurements of transmittance spectrogram of optical cell filled with diesel fuel in the infrared wavelength 2~15 μm at normal incidence were investigated by Bruke V70 FTIR spectrometer. The optical constants and thermal radiative physcial parameters of diesel fuel were achieved. The results show that, (1) The optical constants of water determined by the new method (IDTM) have good agreement with previously data sets. (2) The optical constants calculation precision of the IDTM is similar with MCDTM, which is higher than SODTM and SDTM. (3) The transmittance capability of diesel fuel in the infrared wavelength 2~15 μm are weak, and there exist five absorption peaks, which are respectively 2.4, 3.4, 6.2, 7.3 and 13.8 μm. (4) The spectral selectivity of optical constants and thermal radiative physcial parameters of diesel fuel are stronger, whose values are urgently varied with different wavelenths.