[1]王忆锋,毛京湘,范乃华.用蒙特卡罗方法和MATLAB计算引入挡板结构的冷屏效率[J].红外技术,2010,32(9):513-516.
 WANG Yi-feng,MAO Jing-xiang,FAN Nai-hua.Computation of Effectiveness of Baffled Cold Shieldwith Monte Carlo Method and MATLAB[J].Infrared Technology,2010,32(9):513-516.
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用蒙特卡罗方法和MATLAB计算引入挡板结构的冷屏效率
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《红外技术》[ISSN:1001-8891/CN:CN 53-1053/TN]

卷:
32卷
期数:
2010年第9期
页码:
513-516
栏目:
出版日期:
2010-09-20

文章信息/Info

Title:
Computation of Effectiveness of Baffled Cold Shield
with Monte Carlo Method and MATLAB

文章编号:
1001-8891(2010)09-0513-04
作者:
王忆锋毛京湘范乃华
昆明物理研究所,云南 昆明 650223
Author(s):
WANG Yi-fengMAO Jing-xiangFAN Nai-hua
Kunming Institute of Physics, Kunming 650223, China
关键词:
冷屏挡板冷屏效率红外成像系统蒙特卡罗方法MATLAB
Keywords:
cold shieldbafflecold shield effectivenessinfrared imaging systemMonte Carlo methodMATLAB
分类号:
O435
文献标志码:
A
摘要:
在制冷型红外成像系统中,冷屏具有定义视场角大小、限制杂散光辐射的作用。冷屏效率的计算无解析公式,一般需要用数值方法求解。介绍了用蒙特卡罗方法和MATLAB计算内含两层挡板的圆形冷屏效率的一种解决方案。该方法基于三维空间中的方向数概念,首先利用MATLAB命令生成冷屏孔径区域内的随机点,再赋予该点一组随机方向数,获得一条随机直线方程;根据镜面反射的性质及解析几何公式,生成该直线在冷屏内壁上的反射光线,并判断它们是否被挡板所阻拦,以及是否落在探测器芯片区域,由此可以确定冷屏效率。该方法具有编程简单、方便实用等特点。
Abstract:
The cold shield defines the angle of viewing field and limits stray radiation in cooled infrared imaging system. Analytical formula is not available for cold shield effectiveness, and numerical methods are usually needed for its computation. A solution for computing effectiveness of a circular cold shield with two baffles using Monte Carlo method and MATLAB is presented in this paper. It is based on the concept of direction numbers in three dimensional space. First, a random point on the aperture of cold shield is generated with MATLAB. Then a group of random direction numbers is associated to that point so an equation of a random straight line is formed. Ray reflected from the inner wall of cold shield is generated according to the property of specular reflection and formulae in analytical geometry. After judging that if they are blocked by the baffles and if falls into the region of detector chip, the cold shield effectiveness can be determined. It is easy in programming and convenient in operation.

参考文献/References:

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[3] ?王忆锋, 庄继胜, 毛京湘. 用蒙特卡罗方法和MATLAB计算糖果形冷屏的视场角[J]. 红外, 2009, 30(18): 45-48.
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更新日期/Last Update: 2014-04-18