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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 1 — Jan. 1, 2013
  • pp: A9–A17

Three-dimensional velocity near-wall measurements by digital in-line holography: calibration and results

Daniel Allano, Mokrane Malek, Françoise Walle, Frédéric Corbin, Gilles Godard, Sébastien Coëtmellec, Bertrand Lecordier, Jean-Marc Foucaut, and Denis Lebrun  »View Author Affiliations


Applied Optics, Vol. 52, Issue 1, pp. A9-A17 (2013)
http://dx.doi.org/10.1364/AO.52.0000A9


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Abstract

Velocity measurements in the vicinity of an obstacle remain very complicated even when optical diagnostics based on displacement of micrometric tracers are considered. In the present paper, digital in-line holography with a divergent beam is proposed to measure the three-dimensional (3D) velocity vector fields in a turbulent boundary layer and, in particular, on the near wall region of a wind tunnel. The seeding droplets (1–5 μm) transported by a turbulent airflow are illuminated by a couple of laser pulses coming from a fiber coupled laser diode. These double exposure holograms are then recorded through a transparent glass reticle specially designed for this application with an accurate surface positioning combined with a particularly attractive in situ calibration method of the investigation volume (less than 10 mm 3 ). The method used for processing holograms recorded in such a configuration is detailed. Our original calibration procedure and the assessment of its accuracy are presented. Our holographic probe has been tested in a wind tunnel for a large range of different velocities. Then 3D velocity vector fields extracted from more than 13000 holograms are analyzed. Statistical results show the capability of our approach to access in a turbulent boundary layer. In particular, it leads to relevant measurements for fluid mechanics such as velocity fluctuation and the shear stress in the very close vicinity of a wall.

© 2013 Optical Society of America

OCIS Codes
(090.0090) Holography : Holography
(110.2960) Imaging systems : Image analysis
(090.1995) Holography : Digital holography

History
Original Manuscript: June 28, 2012
Revised Manuscript: August 27, 2012
Manuscript Accepted: August 28, 2012
Published: October 1, 2012

Citation
Daniel Allano, Mokrane Malek, Françoise Walle, Frédéric Corbin, Gilles Godard, Sébastien Coëtmellec, Bertrand Lecordier, Jean-Marc Foucaut, and Denis Lebrun, "Three-dimensional velocity near-wall measurements by digital in-line holography: calibration and results," Appl. Opt. 52, A9-A17 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-1-A9

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