泡沫镍孔隙尺度光谱辐射特性的实验与数值研究

发布时间：2018-04-10 06:36

本文选题：表面光学　切入点：辐射　出处：《光学学报》2017年04期

【摘要】：实验测量了不同厚度的泡沫镍在0.4~2.2μm波长的法向-半球反射率/透射率,采用蒙特卡罗法对泡沫镍的计算机断层扫描结构进行孔隙尺度辐射传输建模,对比研究了泡沫镍辐射特性随入射光谱和样品厚度的变化,计算得到了泡沫镍辐射特性的孔隙尺度分布特征。结果表明:所建立的泡沫镍孔隙尺度辐射传输模型在计算其光谱辐射特性方面具有正确性。波长增长,吸收率逐渐降低,反射率逐渐升高;样品厚度增加,吸收率逐渐升高并趋于稳定,透射率逐渐降低至0。孔隙尺度辐射特性分布强烈依赖于局部纹理结构,波长1.5μm时,泡沫孔隙中的平均吸收率是肋筋上的1.5倍,而肋筋上的平均反射率则达到孔隙中平均反射率的3.7倍。
[Abstract]:The normal hemispherical reflectance / transmittance of nickel foam with different thickness at the wavelength of 0.4 渭 m and 2.2 渭 m was measured experimentally. Monte Carlo method was used to model the radiative transfer of foamed nickel on a porous scale.The variation of radiation characteristics of nickel foam with incident spectrum and sample thickness was studied. The pore size distribution characteristics of the radiation characteristics of nickel foam were calculated.The results show that the proposed porous scale radiation transfer model for nickel foam is correct in calculating its spectral radiation characteristics.With the increase of wavelength, the absorptivity decreases and the reflectivity increases, while the thickness of the sample increases, the absorptivity increases and becomes stable, and the transmittance decreases to 0.The distribution of pore size radiation characteristics is strongly dependent on the local texture structure. At 1.5 渭 m wavelength, the average absorptivity in foam pores is 1.5 times higher than that in ribbed ribs, and the average reflectivity of ribbed ribs is 3.7 times of that in pores.
【作者单位】：哈尔滨工业大学能源科学与工程学院;
【基金】：国家自然科学基金重点项目(51536001) 基础科研项目(B2320132001)
【分类号】：TG146.15;TB383.4

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