Digital holographic measurement of liquid–liquid two-phase flows
| Autor: | Laurent Bruel, Marc Himbert, Fabrice Lamadie |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Diffraction
Autofocus Materials science Opacity business.industry Mechanical Engineering Phase (waves) Holography Physics::Optics Function (mathematics) Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Physics::Fluid Dynamics Optics law Thin lens Liquid liquid Electrical and Electronic Engineering business |
| Zdroj: | Optics and Lasers in Engineering. 50:1716-1725 |
| ISSN: | 0143-8166 |
| DOI: | 10.1016/j.optlaseng.2012.07.010 |
| Popis: | A direct application of digital in-line holography to liquid droplets dispersed in a continuous liquid phase is described. The droplet size imposes a regime of intermediate-field diffraction that has been little explored to date. Acquired diffraction patterns show that the usual opaque disk model is not valid and that good agreement is obtained with a thin lens model. Hologram focusing is nevertheless performed with a dedicated automated method that slightly outperforms Royer criteria. A literature review has been conducted to identify the sharpest autofocus function for our application. Droplet paths are retrieved in three dimensions simultaneously with their velocity and diameter. The developed experimental setup is a first step toward implementation of the method in more complex configurations, including pulsed flows. |
| Databáze: | OpenAIRE |
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