Application of the digital shearing method to extract three-component velocity inholographic particle image velocimetry
Identifieur interne : 001506 ( Main/Merge ); précédent : 001505; suivant : 001507Application of the digital shearing method to extract three-component velocity inholographic particle image velocimetry
Auteurs : Hui Yang [Royaume-Uni] ; Neil Halliwell [Royaume-Uni] ; Jeremy Coupland [Royaume-Uni]Source :
- Measurement Science and Technology [ 0957-0233 ] ; 2004.
Abstract
We have recently proposed a new method to extract the three-dimensional (3D) velocityvector data from double-exposure holographic particle image velocimetry (HPIV), which wecall the digital shearing method. In contrast to the full 3D correlation, it has been shownthat all three components (3Cs) of particle image displacement can be retrieved using sixtwo-dimensional fast Fourier transform operations and appropriate coordinatetransformations. In this paper we demonstrate the capabilities of this approach on actualHPIV data.The holographic recording method described uses an imaging system to recorda hologram of high numerical aperture using a conventional 35mm film. Theholograms are digitized and particle images are reconstructed numerically. Fromparticle images reconstructed from separate holograms, we illustrate the analysisprocess by computing the 3Cs of particle image displacement in a step-by-stepmanner.
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DOI: 10.1088/0957-0233/15/4/011
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