文档介绍：
各向异性发射球体小目标热红外特性研究#
黄勇,崔雪*
(北京航空航天大学航空科学与工程学院)
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摘要:本文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,将辐射方向调控在法向段小辐射角范围内,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。
关键词:红外辐射;红外特性;角度分配;能量份额;灰度值
中图分类号:V19
Thermal infrared characteristics of spherical small objects
with anisotropic emission behavior
HUANG Yong, CUI Xue
(School of Aeronautics Science and Engineering, Beihang University, Beijing, 100191)
Abstract: This paper establishes the stochastic probability model of sphere object detection to
investigate the thermal infrared characteristics of anisotropic emitters. The Monte Carlo method
was employed to simulate the sampling imaging process. The averaged energy portion of detector
array cells counted within the designated integral time is defined as gray levels, and the gray level
image generated can quantitatively illustrate the influences of anisotropic thermal radiation upon
target infrared signatures. The results show that as for a distant-field small object, confining the
radiation direction within a narrow angle near the normal, that is increasing the normal emissivity
of object surface materials, is capable to strengthen the maximum pixel intensity and enhance the
energy contrast within the image region, t