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基于材料的各向异性发射特性,以点目标红外探测为应用模型,采用蒙特卡洛法建立从目标到探测器的红外传输模型,分析四种简单几何体表面的各向异性发射特性对目标红外信号的影响。结果表明,点源红外信号对各向异性发射特性的灵敏性与目标几何外形及目标表面发射率的角度分配性有关。当半球发射率保持一定时,点源信号对法向小辐角发射模型灵敏度较高,且增大法向发射率可提高目标总红外辐射强度。另外,相比椭球体、圆柱体和圆锥体,球体红外信号对各向异性发射的灵敏度最低,即发射率的角度分配性对球体目标红外信号影响最小。
Based on the anisotropic emission characteristics of the material, a point target infrared detection is used as the application model, a Monte Carlo method is used to establish the infrared transmission model from the target to the detector, and the anisotropic emission characteristics of the four simple geometric surfaces are analyzed. Impact. The results show that the sensitivity of the point source infrared signal to the anisotropic emission characteristics is related to the angle distribution of the target geometry and the target surface emissivity. When the hemispherical emissivity remains constant, the point source signal has a high sensitivity to the normal small-angle-angle emission model, and increasing the normal emissivity can improve the target total infrared radiation intensity. In addition, compared with ellipsoids, cylinders and cones, the sensitivity of the spherical infrared signal to the anisotropic emission is the lowest, that is, the angular distribution of emissivity has the least influence on the target infrared signal of the sphere.