仿鲍鱼壳微结构中远红外反射特性测试与仿真

Testing and simulation of far infrared reflection characteristics in the microstructure of abalone shell

摘要:

研究鲍鱼壳微结构在红外波段反射特性。通过扫描电镜对鲍鱼壳横截面进行观察，发现珍珠层呈现规则的“叠层砖-泥”结构。采用傅里叶红外光谱仪测试发现该结构在中远红外区具有较高反射率，利用comsol对结构进行模拟，详细研究了结构参数对反射效率的影响，发现结构为42层砖泥结构，其中的文石层厚1.17μm折射率2，蛋白质层厚2μm，填充空气折射率为1对红外隐身具有很好的效果。采用不同质量分数的聚乙烯醇进行冷冻干燥循环，构建模拟的叠层结构. 研究结果，发现10wt%的聚乙烯醇制备的层状结构样品，其红外反射率测试值与模拟结构的结果相吻合。

Abstract:

The reflection characteristics of abalone shell microstructure in the infrared band were studied. By scanning the cross-section of the abalone shell, the " stacked brick-mud" structure of the pearl layer was found to be regular. Using Fourier infrared spectrometer test, it was found that this kind of structure display a high reflectivity in the medium and far infrared region. Then the Comsol software was used to simulate the "brick-mud" structure to investigate the reflectivity from visible region to infrared region. The effect of structural parameters on the reflective efficiency was studied in details. It was found that, when 42 layers of brick mud structure, of which the paper layer was 1.17 m thick and refractive index was 2, the protein layer was 2 m thick, and the filled air refractive index was 1, the reflectivity in infrared region obtained was satisfied with infrared stealth. The frozen drying cycle is carried out by polyethylene alcohol with different mass fractions, and the simulated laminated structure is constructed. The results showed that the infrared reflectivity value of the 10wt% polyethylene alcohol was consistent with the results of the simulated structure.