激光与微纳米粒子相互作用形成散斑的数值模拟
关键词 散斑 扩散近似 蒙特卡洛方法
毕业设计说明书（毕业论文）中文摘要
毕业设计说明书（论文）外文摘要
Title Numerical Simulation of the Speckles Formed by the Interaction Between Micro Nano Particle And Laser
Abstract
Scattering and adsorption occur when light transportation in the nanofluids. The photons through fluid will form dynamic speckle. Thermal conduction equation can be expressed interaction between light and medium. In this paper, Monte Carlo method is used to simulates the interaction between light and particles to research the mechanism of the interaction between lasers and medium. It turns out that broadening effects appears in the process of transportation of the pulse laser. Then compared with the results of the diffusion equation, we found that the diffusion approximation is just proper to the much thicker medium，which is to some extent limited. The Monte Carlo method which is characterized of accurate calculation can provide theoretical basis for the further research of the mechanism of the formation of speckle.
Keywords Speckle Diffusion approximation Monte Carlo Method
目 次
1 引言 5
1.1 散斑的研究意义 5
1.2 蒙特卡洛方法简介 5
1.3 本文的主要研究工作 7
2 光在介质中的传播特性 7
2.1 介质的光学参数 7
2.2 热辐射传导方程 8
2.3 扩散近似 9
2.4 小结 9
3 扩散板中求解扩散方程 9
3.1 建立模型 9
3.2 算法实现 10
3.3 小结 12
4 蒙特卡洛模型的建立与数值模拟 12
4.1 建立模型 12
4.1.1 介质模型 13
4.1.2 光源模型 13
4.2 算法的实现 13
4.2.1 随机变量抽样 13
4.2.2 光子初始化 14
4.2.3 步长的确定 15
4.2.4 光子的移动 15
4.2.5 光子与组织相互作用 16
4.2.6 光在介质表面的反射和透射 17
4.2.7 光子的湮灭 18
4.3 小结 19
5 模拟结果与数值分析 20
5.1 蒙特卡洛模拟流程图 20
5.2 程序验证 21
5.3 数据分析 21
5.4 小结 23
结 论 24
致 谢 25
参考文献26
1 引言
1.1 散斑的研究意义