Reconstruct interior properties of participating semitransparent media using peak values of transient radiative signals

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.