Design and Radiation Characteristics of Thermal Control Metamaterials Based on Photonic Resonance Effect
The concept of metamaterials is innovated to meet the requirements of efficient heat dissipation on spacecraft surfaces,and a novel idea of efficient optical heat dissipation materials with micro-nano structure based on the resonance effect is proposed.Based on the analyses on material component selection and physical property calculation,visible light high-reflection and infrared high-emission models suitable for the efficient heat dissipation in space are investigated and established.The results show that by synthesizing one-dimensional photonic crystals with two kinds of materials,i.e.,high and low refractive index materials,ultra-high reflectance can be achieved in a few film layers.When the diamond/NaF and GaP/NaF layers are superimposed,the average reflectance in the 250～2 500 nm band is 99.97%when the total number of layers is 71.A SiO2 microsphere with the width diameter of 2～8 μm is designed to periodically align photonic crystals,the infrared emissivity of which is over 99%in the 250～2 500 nm band.The above two models are combined further.The obtained emissivity in the 3～15 μm band reaches 92%,and the obtained emissivity in the 8～15 μm band reaches 94%.The heat dissipation performance is significantly improved compared with the traditional thermal control coating.
spacecraftthermal control coatinghigh reflection and high emissionresonance effectphotonic crystal
万方数据
维普
