多孔结构材料有效吸收系数的计算模型和实验分析

Computation Model and Experimental Analysis for Effective Absorption Coefficient of the Multi-pore Materials

基于波动光学理论建立了激光在多孔结构材料中传输的物理数学模型,计算了多孔结构材料有效吸收系数ε0(λ)和材料本身吸收系数ε(λ)及多孔结构特性参数A/St的变化关系。利用吸收系数ε(1.06μm)约为0.56的材料通过浸渍和高温烧结法制备不同孔径的多孔结构材料,采用Lambda 900型紫外/可见光/近红外分光光度计测试多孔结构材料样品在1.06μm附近的吸收系数,实验结果分析表明,多孔结构材料的有效吸收系数ε0(1.06μm)随着A/St的增加而降低,其变化趋势和理论计算结果一致。为此,在材料本身的吸收系数一定的情况下,可通过调整多孔结构特性参数A/St,制备出吸收性能更好的多孔结构材料。

The physical mathematical model for the transmitting properties of laser in multi-pore samples was established based on the wave optics theory.The varied relations of the effective absorption coefficient ε0（λ） with the built-in absorption coefficient ε（λ） of materials and the multi-pore construction parameters A/St were optimized.The maceration and high temperature sintering methods were used to fabricate the multi-pore construction with the material ε（1.06 μm） equaling to 0.56.The absorption coefficient around 1.06 μm was measured by Lambda 900 UV/VIS/NIR spectrometer.Experimental results show that the effective absorption coefficient ε0（1.06 μm） declines with increasing the multi-pore construction parameter A/St,which is consistent with the theoretical computation.Therefore,the multi-pore structure materials with better absorption performance can be prepared by adjusting the characteristic parameter A/St at a certain material absorption coefficient.