WARPE: A parallelized Monte Carlo ray tracing approach to evaluate the travel-time in turbid plane-parallel media with interfaces

We present a Monte Carlo Ray tracing model called WARPE (Waveform Analysis and Ray Profiling for Exploration) to study the travel-time in turbid plane-parallel media with possible interaction at interfaces. It is an efficient model with a fast computation time guaranteed by ray batch parallelization. This model has been validated for both spatial and time dimension of the radiative transfer using robust reference models. An application to explore the influence of the radiative parameters has been conducted and reveal that optical depth, single scattering albedo, directionality of the medium, refractive index and extinction coefficient have a crucial role on the time-resolved reflectance. This is illustrated by peak features representing the various back and forth travels of the light in the medium for both diffused and unaffected rays. The top reflection at the first interface and the background scattering are described as well. This model shall be used with inversion method in order to interpret real data to improve the understanding of the microphysics of turbid media with interfaces.