基 于 平 面 激 光 散 射 的 人 体 边 界 层 及 口 呼 吸 可 视 化 研 究

Dynamic visualization of the human boundary layer and oral breathing is of significant importance in respiratory disease transmission research and optimization of individual protection strategies. To this end, a visualization method based on Planar Laser Scattering（PLS）is proposed to investigate the interaction between human oral breathing and the boundary layer thermal plume. In this method, a human model is illuminated with a fan-shaped laser sheet, aerosol tracer particles are used to visualize the airflow, and a high-sensitivity sCMOS camera captures the particle scattering signals. By employing image processing algorithms such as background subtraction and laser intensity correction, along with a three-dimensional reconstruction method, two- and three-dimensional dynamic visualization of the human boundary layer thermal plume and oral breathing airflow is achieved. Experimental results demonstrate that this method can clearly visualize the rising process of the human surface boundary layer thermal plume, reveal the interference of oral breathing airflow with the thermal plume, and reconstruct the three-dimensional spatial distribution of the oral breathing airflow and its interaction with the boundary layer. This method provides a novel technical approach for studying the interaction between human respiratory processes and environmental airflow, as well as for a deeper understanding of the mechanisms of respiratory disease transmission.