混浊物质中光子传输的快速模拟与干涉特性分析  

Fast Simulation and Interference Properties of Photons Transmission in Turbid Material

作　　者：林林[1] 高应俊[2] 金重星[2] 林惠珍[2] 罗云瀚[2] 

机构地区：[1]广东医学院生物医学工程教研室,广东东莞523808 [2]暨南大学理工学院光电工程系,广东广州510632

出　　处：《光学学报》2011年第6期258-263,共6页Acta Optica Sinica

基　　金：国家自然科学基金(61008057)资助课题

摘　　要：建立了混浊物质中低相干干涉系统的蒙特卡罗模型，结合相干面光强的高斯分布和低相干光源的相干条件，对干涉信号进行了数值分析。提出在蒙特卡罗计算的基线数据基础上快速模拟其他参数条件下干涉信号的方法。快速模拟结果与蒙特卡罗计算结果进行了比较，结果显示在满足前向散射条件下，两种方法所得模拟信号强度基本吻合。当各向异性因子g=0．9时，平均相对误差为2．37％，在g=0．5时，平均相对误差为4．69％。在深度相关干涉信号的模拟中，两种方法对浅表层干涉信号的模拟取得了一致的结果。实验中使用低相干干涉系统对不同浓度的脂肪悬乳注射剂与印度墨水混合液中深度为0～1mm的漫反射光信号进行了干涉测量，并利用基线数据和快速蒙特卡罗模拟方法成功对实验数据进行了数值拟合。In order to analyze low-coherent signal characteristics of turbid material, Monte Carlo（MC） numerical model is established. The Gaussian distribution of optical intensity and coherent gate of optical source are introduced into numerical simulation. An accelerated method is introduced into simulation of coherent intensity of turbid medium. Under condition of forword scattering, anisotropy factor 9 ~0.9, the results of scaling method match with those of MC simulation with mean relative error of 2.37%. When g decreases to 0.5, and mean relative error increases to 4.69 %. In calculation of coherent signals of different depths, similar data in surface layer are gotten by the two methods. In experiment, optical signals from 0 to 1 mm depth in the mixture liqid of IntralipidTM and India ink are measured by low-coherent system and fitted by accelerated Monte-Carlo method succesfullv.

关 键 词：相干光学 混浊物质 蒙特卡罗法 高斯光束 

分 类 号：O43[机械工程—光学工程]