低发射率光子晶体(PC)具有高反射特性, 在高温环境的强烈照射下, 高反射光子晶体会成为亮目标。为了使光子晶体具有环境适应性, 使之在相当宽的照度范围内都能与背景融合, 对光子晶体的特性进行了深入研究。采用改变光子晶体周期数的方法, 设计并制作了发射率分别为0.116、0.212、0.307、0.519、0.606、0.718的6种光子晶体, 拼接成4块光子晶体迷彩(PCpp), 并将其覆盖在仿真目标上。用8～14 μm热像仪观察目标和背景, 并记录各个时间点的平均辐射温度数据, 利用辐射温度来计算目标和背景之间的欧式距离和目标在此背景下的伪装效率。对比结果发现, 发射率为0.212、0.307和0.606的光子晶体迷彩在温度范围为292～302 K的条件下, 该光子晶体迷彩的平均温度与草地背景温度的欧式距离为12.55 K, 极限温差ΔT0为4 K时的伪装效率为76.92%, 能够使目标和背景很好地融合。

Photonic crystals (PC) with low emissivity have high reflectance, and they will become bright targets under strong radiation from high temperature environment. Further researches on PC characteristics are made in order to let PC have adaptive capacity to environment and fuse with background well within a pretty broad luminance range. Six PCs, with emissivity of 0.116、0.212、0.307、0.519、0.606 and 0.718, are designed and made by the method of changing PC period. PCs are jointed into four PC pattern paintings (PCpp), and they are covered on the surface of simulation target. The target and background are observed by the 8～14 μm thermal imager, and their mean radiant temperatures of each time point are recorded. Euclidean distance between target and background and camouflage efficiency of the target under this background are calculated by radiant temperature. Compared with the results, it is found that camouflage efficiency is 76.92%, when the temperatures of PCpp with emissivity of 0.212、0.307 and 0.606 are in the range of 292～302 K, the Euclidean distance between the mean temperature of PCpp and the temperature of the grass background is 12.55 K, and the limit temperature difference ΔT0 is 4 K, which can make the target and the background fuse well.