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Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN Imprimer: 1065-3090
ISSN En ligne: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.2018026686
pages 25-32

OBSERVING BUBBLES USING PHASE-RETRIEVAL HOLOGRAPHY

Atsuo Kubonishi
Kyoto Institute of Technology, Matsugasaki Hashikamicho 1, Sakyo-Ku, Kyoto 606-8585, Japan
Yohsuke Tanaka
Kyoto Institute of Technology, Matsugasaki Hashikamicho 1, Sakyo-Ku, Kyoto 606-8585, Japan
Shigeru Murata
Kyoto Institute of Technology, Matsugasaki Hashikamicho 1, Sakyo-Ku, Kyoto 606-8585, Japan

RÉSUMÉ

In-line holography is a way to measure the sizes of small bubbles in three-dimensional space. However, the image quality is limited because lack of phase information causes the real and virtual images to overlap. This twin-image problem leads to false detection when measuring bubble diameters. Phase-retrieval holography is a way to recover the missing phase information. It is retrieved by an iterative calculation using two or more holograms recorded at different positions. In this study, we focus on phase-retrieval holography involving two recorded holograms. The purpose of this study is to show that this method suppresses the effects of the twin-image problem. Using phase-retrieval holography, we obtain clear reconstructed images with high contrast.