Size determination of mixed liquid and frozen water droplets using interferometric out-of-focus imaging

• Published in: Journal of quantitative spectroscopy & radiative transfer Vol. 178; pp. 108 - 116
• Main Authors: Jacquot Kielar, Justin, Wu, Yingchun, Coëtmellec, Sébastien, Lebrun, Denis, Gréhan, Gérard, Brunel, Marc
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-07-2016; Elsevier
• Subjects: Digital holography; Droplets; Engineering Sciences; Freezing; Frozen; Holograms; Holography; Ice particles; Imaging; Interferometric particle imaging; Interferometry; Liquids; Optics; Photonic; Ice particles; Digital holography; Droplets; Interferometric particle imaging
• ISSN: 0022-4073; 1879-1352
• DOI: 10.1016/j.jqsrt.2015.09.009

We record simultaneously interferometric out-of-focus images and digital in-line holograms of liquid and frozen water droplets. We show that the analysis of speckle-like out-of-focus images allows a quantitative estimation of the size of the particles which is corroborated by numerical reconstruction of holograms recorded simultaneously. Interferometric out-of-focus imaging could be extended to the characterization of ice in clouds in the atmosphere.
•Interferometric out-of-focus imaging is used to measure size of liquid and frozen water droplets.•Results are validated using digital in-line holography.•Rate of errors is evaluated.