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Proceedings Paper

Fluid mechanics measurement based on the anisotropic core structure of pseudophase singularities in analytic signal representation of speckle pattern
Author(s): Wei Wang; Mark R. Dennis; Reika Ishijima; Tomoaki Yokozeki; Akihiro Matsuda; Steen G. Hanson; Mitsuo Takeda
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Paper Abstract

A new technique for fluid mechanics measurement is proposed that makes use of pseudophase singularities in an analytic signal representation of a speckle-like pattern generated by a Laguerre-Gauss filter operation. Based on the formal analogy between the polarization of the vector wave and the gradient field for the complex analytic signal, a set of Stokes-like parameters have been applied for the description of the anisotropic core structure of the pseudophase singularities, which serves as unique fingerprints attached to the seeding particles moving with the flow. Experimental results for flow velocity and acceleration measurement are presented that demonstrate the validity of the proposed optical vortex metrology for fluid mechanics measurement.

Paper Details

Date Published: 18 June 2007
PDF: 8 pages
Proc. SPIE 6616, Optical Measurement Systems for Industrial Inspection V, 66160W (18 June 2007); doi: 10.1117/12.725123
Show Author Affiliations
Wei Wang, The Univ. of Electro-Communications (Japan)
Mark R. Dennis, Univ. of Southampton (United Kingdom)
Reika Ishijima, The Univ. of Electro-Communications (Japan)
Tomoaki Yokozeki, The Univ. of Electro-Communications (Japan)
Akihiro Matsuda, The Univ. of Electro-Communications (Japan)
Steen G. Hanson, Technical Univ. of Denmark (Denmark)
Mitsuo Takeda, The Univ. of Electro-Communications (Japan)

Published in SPIE Proceedings Vol. 6616:
Optical Measurement Systems for Industrial Inspection V
Wolfgang Osten; Christophe Gorecki; Erik L. Novak, Editor(s)

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