一种基于光子晶体结构防红外辐射涂层的研究

为减少蒸气在管道传输中的能耗,针对蒸气所辐射的特征波长在4007.1～7765.7 nm的电磁波,选用常见的Si和SiO2为介质,并在考虑各自色散关系的基础上,设计了一种具有光子晶体结构的保温涂层.利用传输矩阵法计算表明:当两介质各取4层,其几何厚度分别取410.5 nm和972 nm时,在4450 ～ 7600 nm...

Study on infrared radiation prevention coatings based on photonic crystal structure

In order to reduce the energy consumption of the steam transmission in the pipeline,an insulating coating having photonic crystal structure is designed.The steam radiates electromagnetic waves with specific wavelengths of 4007.1~7765.7 nm.Common Si and SiO2 are used as the medium.Calculation using transfer matrix method shows that:when the two medium are of 4 layers respectively,with geometric thickness of 410.5 nm and 972 nm respectively,there would be a strict band gap within 4450~7600 nm,and it has better angle tolerance.When the geometric thickness of two medium increases,the band gap would have red shifts and wider width,and vice versa.When the coating structure is ababa type,the photonic crystal forms a strict band gap between 4597.2~7305.6 nm.With the increasing medium layers,there would be no substantial change to the band gap,therefore,that ababa coating structure is the most economical.