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本文旨在研究具有一维光栅结构表面的热致变色材料La0.825Sr0.175MnO3(LSMO)的热辐射光谱特性及其随结构和温度变化的规律.首先利用K-K关系得到LSMO在不同温度下的介电常数,然后利用时域有限差分方法分析计算对应不同参数的结构表面光谱发射率.研究发现,由于光栅结构激发的微腔谐振效应,LSMO结构表面的光谱发射率呈现出选择性增强的特征.光谱发射率随结构参数的变化情况表明,通过合理选择光栅的结构参数可以得到想要的辐射增强特性.平均发射率随温度的变化表明,相比于光滑表面的LSMO而言,具有光栅结构表面的LSMO的表面发射率有了比较明显的增强,另外热致变色特性有了明显的改善.
The purpose of this paper is to study the thermal radiation spectral characteristics of La0.825Sr0.175MnO3 (LSMO) with one-dimensional grating structure and its dependence on the structure and temperature.Firstly, the relationship between LSMO and different temperatures And then using the finite difference time domain method to calculate and calculate the spectral emissivities of the structures corresponding to different parameters.It is found that the spectral emissivity of the surface of LSMO is selectively enhanced due to the micro-cavity resonance induced by the grating structure. The change of the spectral emissivity with the structural parameters shows that the desired radiation enhancement properties can be obtained by choosing the grating structure parameters reasonably.The variation of the average emissivity with temperature shows that compared with the LSMO of the smooth surface, Of the LSMO surface emissivity has been significantly enhanced, while the thermochromic properties have been significantly improved.