Snapshot 3D reconstruction of liquid surfaces

Optics Express
Adrian RothEdouard Berrocal

Abstract

In contrast to static objects, liquid structures such as drops, blobs, as well as waves and ripples on water surfaces are challenging to image in 3D due to two main reasons: first, the transient nature of those phenomena requires snapshot imaging that is fast enough to freeze the motion of the liquid. Second, the transparency of liquids and the specular reflections from their surfaces induce complex image artefacts. In this article we present a novel imaging approach to reconstruct in 3D the surface of irregular liquid structures that only requires a single snapshot. The technique is named Fringe Projection - Laser Induced Fluorescence (FP-LIF) and uses a high concentration of fluorescent dye in the probed liquid. By exciting this dye with a fringe projection structured laser beam, fluorescence is generated primarily at the liquid surface and imaged at a backward angle. By analysing the deformation of the initial projected fringes using phase-demodulation image post-processing, the 3D coordinates of the liquid surface are deduced. In this article, the approach is first numerically tested by considering a simulated pending drop, in order to analyse its performance. Then, FP-LIF is applied for two experimental cases: a quasi-stat...Continue Reading

References

Mar 10, 2004·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Manuel ServinJuan Antonio Quiroga
May 3, 2014·Optics Letters·Elias KristenssonMarcus Aldén
Mar 7, 2016·Optics Express·Yogeshwar Nath MishraEdouard Berrocal

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