Experiments in Fluids

, 40:708 | Cite as

Holographic particle image velocimetry system for measurements of hairpin vortices in air channel flow

  • A. Svizher
  • J. Cohen
Research Article


A holographic particle image velocimetry system for investigating hairpin vortices, artificially generated in a subcritical plane Poiseuille air flow, is presented. The optical setup is a modified version of the hybrid scheme, previously employed in turbulent water flows. Accordingly, separate reconstruction of holograms, successively recorded on the same photoplate, is provided by using two reference beams. The positioning of the photoplate within the image of the sample volume accompanied by special alignment procedures, minimizes the apparent displacement caused by the misalignment of the reconstruction waves. A novel method is employed for detecting in-focus particles. Testing the system with a fixed 5 μm diameter wire, results in a corresponding 3D wire image having a diameter of ≈25 μm. Finally, the instantaneous topology and 3D distribution of the two velocity components associated with the hairpin vortex are presented.


Particle Image Velocimetry Reference Beam Reference Wave Hairpin Vortex Object Wave 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This research has been supported by the Israeli Science Foundation under Grant no. 412/00. The authors are grateful to Dr. Michael Kogan and Mr. Oleg Kan for their contribution to the software development and to Mr. Efim Shulman for his help in constructing and aligning the optical setup.


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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Faculty of Aerospace Engineering, TechnionI.I.T.HaifaIsrael

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