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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8~14μm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292~302K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12.55K,极限温差ΔT0为4K时的伪装效率为76.92%,能够使目标和背景很好地融合。
Low Emissivity Photonic Crystals (PC) are highly reflective and highly reflective photonic crystals become bright targets under intense exposure to high temperatures. In order to adapt the photonic crystal to the environment and make it fuse with the background in a wide range of illumination, the properties of the photonic crystal are deeply studied. Six kinds of photonic crystals with emissivity of 0.116,0.212,0.307,0.519,0.606 and 0.718 respectively were designed and fabricated by splitting photonic crystal. The four photonic crystals (PCpp) were spliced and covered in Simulation target. The target and background were observed with 8 ~ 14μm thermal imager and the average radiation temperature data were recorded at each time point. The Euclidean distance between the target and the background and the camouflage efficiency of the target in this background were calculated using the radiation temperature. The results show that the photonic crystal camouflage with emissivity of 0.212, 0.307 and 0.606 has a Euclidean distance of 12.55K between the mean temperature of the photonic crystal camouflage and the background temperature of grassland under the temperature range of 292 ~ 302K and the limit temperature difference ΔT0 is 4K When masquerade efficiency of 76.92%, can make the target and the background a good blend.