人工光源对地面目标表面温度的影响分析

Analysis of Ground Targets′S Surface Temperature Irradiated Through Artificial Illuminator

研究人工光源对地面目标表面温度的影响对目标红外特性的研究以及红外特征的模拟有重要的意义.以自然环境下人工光源照射地面目标的物理模型为基础,通过建立导热微分方程和改变目标的外边界辐射能量,建立起人工光源照射目标时目标表面温度的计算模型,结合目标表面温度的计算与目标所处的地理环境与方位有关,本文以合肥某建筑物正东方位表面为例,对在不同时间段、不同光照参量时目标的表面温度进行了仿真计算与分析.结果表明:改变目标的外边界条件即给目标表面采用人工光源照射时,目标的表面温度将发生改变,改变的程度取决于光源的照射功率、照射距离以及光源的入射角,一般情况下,晚上照射时表面温度变化明显,白天照射变化不太明显.

Based on the physical model of which the targets were irradiated through artificial illuminator in normal circumstance,the calculation model of surface temperature was built through building heat conduction differential equations and altering the outedge radiation power.Combing the calculation of surface temperature related to targets′s geographical circumstance and orientation,taking the Hefei building′s eastward surface for example,the surface temperature was simulational calculated and discussed in different irradiation times and illumination parameters.The results show that altering the targets′s outedge namely the targets are irradiated through artificial illuminatorm,the temperature of targets are changed,the degree of variety is determined by illuminator′s power,distance,incident angle,and in general conditions,the surface temperature is changed obviously in the night,but not in the daytime.