n.反射比；反射系数
The spectr al reflectance of each test specimen is measured in situ before and after exp osures. 在辐照前后对每一个试样的光谱反射系数进行了原位测量。
Self-similarity of the frequency spectra of fractal photonic crystals is studied.The optical transmission matrix method is used to calculate transmittance and reflectance. 摘要研究了分形康托结构光子晶体频谱的自相似特性，用光传输矩阵方法计算光的传输和反射系数。
