Nondestructive evaluation of a nano-fibre with interface using photothermal technique

In this study, the nondestructive evaluation on the thermal characters of interface around a nano-fibre is presented. The multiple scattering of plane thermal waves between the nano-fibre and the semi-infinite surface is described. The solution to the heat diffusion equation is expressed by wave function expansion method, and the mode coefficients are obtained by satisfying the boundary conditions at the interface around the nano-fibre. The temperature at the surface of the structure under different parameters is calculated and illustrated graphically. It is found that the interface effect on the temperature becomes great if the solid has a better thermal conductivity. The results can provide the theoretical background for the nondestructive evaluation of interface around the nano-inclusions.