中国物理B ›› 2016, Vol. 25 ›› Issue (12): 120201-120201.doi: 10.1088/1674-1056/25/12/120201

• GENERAL •    下一篇

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

Yao-Bin Qiao(乔要宾), Hong Qi(齐宏), Fang-Zhou Zhao(赵方舟), Li-Ming Ruan(阮立明)   

  1. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
  • 收稿日期:2016-05-13 修回日期:2016-08-09 出版日期:2016-12-05 发布日期:2016-12-05
  • 通讯作者: Hong Qi E-mail:qihong@hit.edu.cn
  • 基金资助:

    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), and the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant No. 51121004).

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

Yao-Bin Qiao(乔要宾), Hong Qi(齐宏), Fang-Zhou Zhao(赵方舟), Li-Ming Ruan(阮立明)   

  1. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
  • Received:2016-05-13 Revised:2016-08-09 Online:2016-12-05 Published:2016-12-05
  • Contact: Hong Qi E-mail:qihong@hit.edu.cn
  • Supported by:

    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), and 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.

关键词: inverse problem, adjoint differentiation, multi-start conjugate gradient method, frequency-domain radiative transfer equation

Abstract:

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.

Key words: inverse problem, adjoint differentiation, multi-start conjugate gradient method, frequency-domain radiative transfer equation

中图分类号:  (Inverse problems)

  • 02.30.Zz
45.10.Db (Variational and optimization methods) 78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)) 78.47.jb (Transient absorption)