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科学通报  2014 

各向异性发射球体小目标热红外特性研究

DOI: 10.1360/972013-1308, PP. 2223-2228

Keywords: 红外辐射,红外特性,角度分配,能量份额,灰度值

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Abstract:

通过建立球体目标探测的随机概率模型,研究了各向异性发射体的热红外特性.运用蒙特卡洛法模拟采样成像,并将探测面阵单元格在积分时间内统计得到能量份额均值定义为灰度值,生成辐射灰度图.通过灰度图定量地表征了目标各向异性热辐射特性对红外信号的影响.结果表明,对于远场小目标,将辐射方向调控在近法向小辐射角范围内,即提高发射体表面材料法向发射率,可增强目标最亮像点信号强度,扩大“像”区域的能量对比度,在红外图像上表现为能量更加集中的信号点.

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