Retrieve properties of participating media by different spans of radiative signals using the SPSO algorithm

The numerical model of a short-pulse laser propagating in participating media was analysed based on the complete transport theory described as the transient radiative transfer equation (TRTE). The finite volume method was used to solve the TRTE for any dimensional problem. Radiative signals are transmitted signals and reflected signals caused by time-domain laser pulse and signal results were compared with the benchmark results obtained by the reverse Monte Carlo method. Moreover, sensitivity analysis has been presented with different thickness, short pulse width and optical properties. In order to estimate the optical parameters effectively, some criteria for choosing more sensitive spans of the measured signals have been obtained based on the sensitivity analysis. Furthermore, different sampling spans and peak values of radiative signals were used as measurement data for inverse analysis by using the stochastic particle swarm optimization algorithm. Firstly, the different sampling times of transmittance and reflectance signals were, respectively, used as the measurement data to reconstruct optical properties (scattering coefficients and absorption coefficients) of one-dimensional participating media. After that, the maximums of the signals for inverse analysis with different albedos were investigated and the properties of different cases were estimated and listed.