【摘要】 为研究金属材料在中波红外波段（3.7～4.8??m）的方向性辐射特性，在40～200℃温区下获取了铝合金样品在不同天顶角及打磨前后方位角的辐射观测数据。基于多角度测量结果，构建了一个由半球发射模型与各向异性微表面模型耦合形成的方向性辐射模型，并将复折射率、双轴粗糙度差异引入其中。通过将模型模拟结果与实测数据进行对比验证，结果表明该模型能够有效描述金属粗糙表面的角度依赖辐射行为。研究发现：金属材料的辐射亮度比随天顶角增大呈正相关，其方向性效应随温度升高而增强；方位角方向上，样品表面两个正交方向的粗糙度差异导致明显的各向异性，且打磨后的铝合金样品在大角度下表现出对称的方位角辐射亮度差异。上述结果验证了所构建模型的有效性，可为金属材料表面辐射特性的分析提供依据。更多还原

【Abstract】 To investigate the directional radiation characteristics of metallic materials in the mid-wave infrared band(3.7～4.8 ??m),this study obtained radiation observation data for aluminum alloy samples at different zenith angles and azimuth angles before and after polishing within the temperature range of 40 ℃ to 200 ℃. Based on multi-angle measurements,a directional radiation model was developed by coupling a hemispherical emission model with an anisotropic micro-surface model,incorporating complex refractive index and biaxial roughness differences. Comparison of model simulations with experimental data validated the model’s ability to accurately describe the angle-dependent radiation behavior of rough metal surfaces. The study revealed that the radiance ratio of metallic materials increases with zenith angle,and its directional effect intensifies with rising temperature. Along the azimuth direction,the difference in roughness between two orthogonal directions on the sample surface resulted in significant anisotropy. Furthermore,the polished aluminum alloy sample exhibited symmetrical azimuth radiance differences at large angles. These findings validate the constructed model’s effectiveness and provide a basis for analyzing the radiative properties of metallic material surfaces.更多还原