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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 22 — Oct. 26, 2009
  • pp: 20342–20348

Real-time visualization of Karman vortex street in water flow field by using digital holography

Weiwei Sun, Jianlin Zhao, Jianglei Di, Qian Wang, and Le Wang  »View Author Affiliations


Optics Express, Vol. 17, Issue 22, pp. 20342-20348 (2009)
http://dx.doi.org/10.1364/OE.17.020342


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Abstract

The Karman vortex street generated behind a circular cylinder in water flow field is displayed and analyzed in real time by means of digital holography. Using a modified Mach-Zehnder interferometer, a digital hologram of the flow field in still state and then a video of continuous digital holograms in flowing state are recorded at 14.6 frames per second by a CCD camera, respectively. A series of sequential phase maps of the flow field are numerically reconstructed from the holograms in different states above based on double-exposure holographic interferometry. By seriating these phase maps, the shape and evolution of Karman vortex street can be displayed in real time in the form of a movie. For comparison, numerical simulation of the Karman vortex street under the boundary conditions adopted in the experiment is also presented, and the consistent results indicate that the experimental observation of Karman vortex street by using digital holography is successful and feasible.

© 2009 OSA

OCIS Codes
(090.2870) Holography : Holographic display
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(280.2490) Remote sensing and sensors : Flow diagnostics
(280.7060) Remote sensing and sensors : Turbulence
(090.1995) Holography : Digital holography
(090.5694) Holography : Real-time holography

ToC Category:
Holography

History
Original Manuscript: August 6, 2009
Revised Manuscript: September 26, 2009
Manuscript Accepted: October 1, 2009
Published: October 23, 2009

Citation
Weiwei Sun, Jianlin Zhao, Jianglei Di, Qian Wang, and Le Wang, "Real-time visualization of Karman vortex street in water flow field by using digital holography," Opt. Express 17, 20342-20348 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-22-20342


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