Accurate reconstruction of the optical parameter distribution in participating medium based on the frequency-domain radiative transfer equation  

作　　者：乔要宾 齐宏 赵方舟 阮立明 

机构地区：[1]School of Energy Science and Engineering,Harbin Institute of Technology

出　　处：《Chinese Physics B》2016年第12期144-152,共9页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.51476043);the Major National Scientific Instruments and Equipment Development Special Foundation of China(Grant No.51327803);the Foundation for Innovative Research Groups of the National Natural Science Foundation of China(Grant No.51121004)

摘　　要：Reconstructing the distribution of optical parameters in the participating medium based on the frequency-domain radiative transfer equation （FD-RTE） to probe the internal structure of the medium is investigated in the present work. The forward model of FD-RTE is solved via the finite volume method （FVM）. The regularization term formatted by the generalized Gaussian Markov random field model is used in the objective function to overcome the ill-posed nature of the inverse problem. The multi-start conjugate gradient （MCG） method is employed to search the minimum of the objective function and increase the efficiency of convergence. A modified adjoint differentiation technique using the collimated radiative intensity is developed to calculate the gradient of the objective function with respect to the optical parameters. All simulation results show that the proposed reconstruction algorithm based on FD-RTE can obtain the accurate distributions of absorption and scattering coefficients. The reconstructed images of the scattering coefficient have less errors than those of the absorption coefficient, which indicates the former are more suitable to probing the inner structure.Reconstructing the distribution of optical parameters in the participating medium based on the frequency-domain radiative transfer equation （FD-RTE） to probe the internal structure of the medium is investigated in the present work. The forward model of FD-RTE is solved via the finite volume method （FVM）. The regularization term formatted by the generalized Gaussian Markov random field model is used in the objective function to overcome the ill-posed nature of the inverse problem. The multi-start conjugate gradient （MCG） method is employed to search the minimum of the objective function and increase the efficiency of convergence. A modified adjoint differentiation technique using the collimated radiative intensity is developed to calculate the gradient of the objective function with respect to the optical parameters. All simulation results show that the proposed reconstruction algorithm based on FD-RTE can obtain the accurate distributions of absorption and scattering coefficients. The reconstructed images of the scattering coefficient have less errors than those of the absorption coefficient, which indicates the former are more suitable to probing the inner structure.

关 键 词：inverse problem adjoint differentiation multi-start conjugate gradient method frequency-domainradiative transfer equation 

分 类 号：O432.1[机械工程—光学工程]