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Investigation of external flows past arbitrary objects requires access to theinformation in the boundary layer and the inviscid flow to paint a full pictureof their characteristics. However, in laser diagnostic techniques such asparticle image velocimetry (PIV), limitations like the size of the sample,field of view and magnification of the camera, and the size of the area ofinterest restrict access to some or part of this information. Here, we presenta variation on the two-dimensional, two-component (2D-2C) PIV to access flowspast samples larger than the field of view of the camera. We introduce anoptical setup to use one laser to create a double-light-sheet illumination toaccess both sides of a non-transparent sample and employ a Computer NumericallyControlled (CNC) carrier to move the camera in consecutive-overlapping steps toperform the measurements. As a case study, we demonstrate the capability ofthis approach in the study of the boundary layer over a finite-size slenderplate. We discuss how access to micro-scale details of a macro-scale flow canbe used to explore the local behavior of the flow in terms of velocity profilesand the shear stress distribution. The boundary layers are not fully capturedby the Blasius theory and are affected by a distribution of pressure gradientwhich in comparison results in regions of more attached or detached profiles.Ultimately, we show that the measurements can also be used to investigate theforces experienced by the body and decompose their effects into differentcomponents.

Double-light-sheet, Consecutive-overlapping Particle Image Velocimetry for the Study of Boundary Layers past Opaque Objects