Snapshot space-time holographic three-dimensional particle tracking velocimetry

Ni Chen, Congli Wang, Wolfgang Heidrich
Laser & Photonics Reviews, 2021


Schematic diagram of the Holo-Flow framework.



Abstract

Digital inline holography is an amazingly simple and effective approach for three-dimensional imaging, to which particle tracking velocimetry is of particular interest. Conventional digital holographic particle tracking velocimetry techniques are computationally separated in particle and flow reconstruction, plus the expensive computations. Usually, the particle volumes are recovered firstly, from which fluid flows are computed. Without iterative reconstructions, This sequential spacetime process lacks accuracy. This paper presents a joint optimization framework for digital holographic particle tracking velocimetry: particle volumes and fluid flows are reconstructed jointly in a higher space-time dimension, enabling faster convergence and better reconstruction quality of both fluid flow and particle volumes within a few minutes on modern GPUs. Synthetic and experimental results are presented to show the efficiency of the proposed technique.

Sample results

framework framework framework

framework framework framework

Sample holograms and the corresponding reconstructions.

Resources

Paper [Chen2021LPOR.pdf (19.3 MB)] 
Code on Github  
Other Links [Wiley]