光谱法研究膨胀石墨红外波段复折射率

摘要

The expanded graphite (EG) with good extinction performance can be used as electro-optical passive jamming materials, and its complex refractive index is an important parameter for study on its extinction property. The reflection spectra of EG pellet in the 0.24 ～ 2. 6 μm and 2. 5 ～ 25 μm waveband were measured respectively. Based on the measured data, the complex refractive index of EG in the wavelength band 5 to 10 μm were calculated by Kramers-Kronig (K-K) relation and Bruggeman effective medium theory, and calculation errors were analyzed. The results indicate that it is practicable to calculate the complex refractive index of EG based on its reflection spectra data.%具有良好消光性能的膨胀石墨可用作红外/毫米波复合无源干扰材料,复折射率是研究其消光性能的重要参数.采用压片法分别对膨胀石墨压片在0.24～2.6 μm和2.5～25μm波段的反射光谱进行了测试.结合所测光谱数据,利用Kramers-Kronig(K-K)关系和Bruggemen有效介质理论对膨胀石墨5～10μm波段的复折射率进行了计算,并作了误差分析.结果表明,利用反射光谱数据计算复折射率的方法是可行的.