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依据试验测量得到特殊镀金聚酯薄膜反射率谱及光学常数,利用Kramers-Kronig(K-K)关系,数值反演了镀金聚酯薄膜反射系数、相位反射率和光学常数。在近红外波段,将理论反演与试验测量值进行比较。结果表明:利用K-K方法反演薄膜材料表面的光学特征光谱反射率和光学常数实部误差较小,其中相位反射率的绝对误差小于0.96°,相对误差平均值为0.0831,但消光系数试验和反演数据误差较大。在缺乏试验测量条件或已知部分材料光学特征的条件下,开展具有薄膜、涂层目标光谱散射和辐射特性的研究工作,该反演方法是行之有效的。
The reflectance spectra and optical constants of special gold-coated polyester films were obtained according to the experimental measurements. The reflection coefficients, phase reflectivities and optical constants of the gold-coated polyester films were numerically inverted by the Kramers-Kronig (K-K) relationship. In the near infrared band, the theoretical inversion is compared with the experimental measurements. The results show that the real part error of the spectral reflectance and optical constant of the optical characteristics on the surface of the thin film material retrieved by the KK method is small. The absolute error of the phase reflectivity is less than 0.96 ° and the relative error is 0.0831. However, Acting data error is larger. The inversion method works well in the absence of experimental measurement conditions or the known optical characteristics of some materials, with research work on film scattering, target spectral scattering and radiation characteristics of coatings.