Application of Schlieren Imaging technique for plasma flow and Mask Airflow

Schlieren imaging is a powerful technique to visualize airflow patterns in open atmosphere. In this work, a single mirror schlieren optical system is applied to visualize the flow pattern of two different scenarios. We have checked the effectiveness of different types of masks: cotton cloth, face sleeve (gaiter mask), surgical, and KN95. Using schlieren imaging, the refractive index of the air jet leaving the mouth can be visualized non-intrusively, giving a clear picture air flow pattern from these masks. Data from this experiment showed promising results with differences in the way the air jet was dissipated into the surrounding atmosphere. Utilization of this technique to measure an atmospheric pressure plasma jet flow pattern when interacting with open atmosphere will also be presented. Preliminary results of gas shielding on the plasma jet behavior will also be discussed. These results have implications for a number of technological applications of plasma.