Monte Carlo method for analyzing the propagation of radiation in the skin layers containing blood in photoplethysmography

Application of Monte Carlo technique for optimization of wearable photoplethysmography (PPG) pulse rate sensors is suggested. The paper describes a numerical method of effective response estimation of PPG sensors taking into account penetration depth of radiation into multilayered tissue structure. The principle and photon propagation rules, which are needed for simulation are described. PPG sensor structure with 7 layer tissue parameters are presented. We show, that using the simulation results in designing the PPG pulse rate sensor optical part will enhance the level of useful received signal by the photodiode.