A microscopic particle image velocimetry (μPIVμPIV) technique is developed based on light field microscopy and is applied to flow through a microchannel containing a backward-facing step. The only hardware difference from a conventional μμPIV setup is the placement of a microlens array at the intermediate image plane of the microscope. The method combines this optical hardware alteration with post-capture computation to enable 3D reconstruction of particle fields. From these particle fields, we measure three-component velocity fields, but find that accurate velocity measurements are limited to the two in-plane components at discrete depths through the volume (i.e., 2C-3D). Results are compared with a computational fluid dynamics simulation.

Citation and Link:

Truscott, T.T., Belden, J., Ni, R., Pendlebury, J., & McEwen, B.,“Three-dimensional microscopic light field particle image velocimetry” Experiments in Fluids, 58 (16), DOI: 10.1007/s00348-016-2297-3, Feb 2017.