中文摘要：

本文采用有限体积法模拟超短脉冲激光在一维参与性介质内的传输,得到瞬态辐射信号,即时域反射信号与透信号随时间变化关系,利用透射和反射信号的极值并结合微粒群算法（PSO）反演估算介质内部物性。本文研究了均匀介质时信号极值计算的目标函数随吸收、散射系数变化关系,结果表明采用极值法能够准确地反演均匀介质物性。此外,研究了两层非均匀介质时目标函数随散射系数变化关系。在吸收系数已知时,采用单面照射激光所得信号极值能够反演出两层介质各自的散射系数。最后,本文研究了同时反演两层介质的吸收和散射系数,采用综合反演的方法能够准确地反演出各层介质的吸收和散射系数。

英文摘要：

The Finite Volume Method（FVM） was used to simulate the ultra-short pulse laser propagating in a participating.Then,transient radiative signals,i.e.temporal reflectance and transmittance,could be obtained.Peak values of these signals were used to reconstruct the interior properties of media combined with the Particle Swarm Optimization（PSO） algorithm.Firstly,in the homogenous medium case,the objective function changing with absorption and scattering coefficients was calculated using the peak values.Then,the results show that the peak values can accurately estimate the homogenous medium properties.Moreover,in two-layer media cases,the objective function changing with two scattering coefficients was calculated and analyzed.When the absorption coefficients were known,the scattering coefficients could be estimated correctly using one-side incidence model.When both the absorption and scattering coefficients were need to be estimated simultaneously,the comprehensive model could accurately estimate each layer property of the medium.