Measurement and verification of concentration-dependent diffusion coefficient: Ray tracing imagery of diffusion process

Wei Li¹, Meng Wei-Dong^{1, 2}, Sun Li-Cun³, Cao Xin-Fei¹, Pu Xiao-Yun^{1, 2, †}

(a) Three-dimensional (3D) imaging diagram of ray in homogeneous media, (b) 3D imaging diagram of ray in inhomogeneous media, (c) two-dimensional (2D) imaging diagram of ray in homogeneous media (xy plane), and (d) 2D imaging diagram of ray in inhomogeneous media (x’z plane).