Measuring Shear and Normal Forces in a Microchannel Induced by Fruid Inertia Using Embedded Pattern and Sampling Moiré Method

This paper presents a method for quantifying shear and normal force distributions inside a microchannel using the Sampling moiré (SM) method. The technique analyzes displacements of embedded wall patterns observed through a prism with a single camera, enabling simultaneous twoaxis force measurements without disturbing the flow. The device requires only minor modifications to conventional microchannel fabrication processes and can be easily applied to various channel geometries. This approach provides a versatile platform for in vitro studies of endothelial cell (EC) responses to mechanical forces and for drug testing under controlled flow conditions. The results show pressure distributions along the bottom surface of the microchannel with time evolution corresponding to the flow.