Two in-line holograms algorithm applied to PIV

 

S. Houmairi, K. Assid, S. Rachafi, A. Nassim

Laboratoire IMC, Faculté des Sciences, Département de Physique, 24000 El Jadida, Maroc

* Corresponding author. E-mail: knassim58@yahoo.fr

Received: 24 January 2006; revised version accepted:06 July 2007

 

Abstract

     We present a DHPIV (Digital Holographic Particle Image Velocimetry) technique for diagnosing 3D particulate flows. In this technique we record in-line holograms directly by CCD camera and we reconstruct them numerically. The reconstruction algorithm which is presented in this paper uses two in-line holograms. This method avoids the twin image noise and gets the absorption and phase shift of the object with good accuracy. Conventional particle extraction methods, using only absorption data, cannot yield high depth resolution which is important for velocity measurement and particulate flow diagnostics. To solve this problem, we propose a new particle extraction method based on the use of both the absorption and the phase shift data of the reconstructed object. This method was tested by numerical simulation.

 

Keywords: Digital holography; Particle image velocimetry PIV; Fluid diagnostic.

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