# Three-dimensional microscopic light field particle image velocimetry

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## Abstract

A microscopic particle image velocimetry (\(\mu \text {PIV}\)) 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 \(\mu\)PIV 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.

## Keywords

Particle Image Velocimetry Point Spread Function Light Field Particle Tracking Velocimetry Microlens Array## Notes

### Acknowledgements

This material is based upon work supported by the National Science Foundation under Grant No. 1126862. JB gratefully acknowledges funding from the Office of Naval Research under task number N0001413WX20545 monitored by program officer Dr. Ronald Joslin (ONR Code 333).

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