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Digital in-line holography for near field observation of liquid-liquid flow

Abstract : Liquid-liquid extraction is used in many industrial processes. Such processes involve liquid-liquid flows, called emulsions, which can be successfully characterized by especially suited holographic techniques. Because the droplets are millimeter size, a near-field diffraction regime is observed. This regime departs from conventional holography and requires adapted numerical solutions. Due to droplets transparency positioning could not be achieved by usual focusing methods based on research of singularities. The only suitable method is based on calculating an indicator. To be effective a segmentation of the image into individual diffraction patterns is needed. As initial reconstruction can lead to errors, to further improve robustness, the hologram restitution is checked, and then the four parameters, radius and position, are optimized to fit the acquired hologram. If some missing droplets are found, they are identified and included. As a result about slightly less than twice as many drops are included, leading to a shadow density of 20%. Results presented in this communication are on a dedicated device. Outlooks are regarding the adaptation to cylindrical geometry of industrial columns. To address this point a prospect study, using fractional Fourier transform and transfer matrix models, has been conducted.
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https://hal-cea.archives-ouvertes.fr/cea-03018914
Contributor : Bibliothèque Cadarache <>
Submitted on : Monday, November 23, 2020 - 10:26:27 AM
Last modification on : Tuesday, November 24, 2020 - 3:07:00 AM

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  • HAL Id : cea-03018914, version 1

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Fabrice Lamadie, Laurent Bruel, Lila Ouldarbi. Digital in-line holography for near field observation of liquid-liquid flow. 10th International Conference on Laser-light ans interactions with particles, Aug 2014, Marseille, France. ⟨cea-03018914⟩

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