3D surface reconstruction of liquid structures in sprays using structured illumination and phase demodulation

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


title = "3D surface reconstruction of liquid structures in sprays using structured illumination and phase demodulation",
abstract = "The accurate surface reconstruction of 3D liquid structures is an important aspect for the understanding ofspray formation and liquid breakups. In this article, an approach to image in 3D the surface of liquid structuresin sprays (such as ligaments, liquid sheets/cores and liquid blobs) is presented. The technique is named FringeProjection - Laser Induced Fluorescence (FP-LIF) which is used by illuminating the liquid structures using alaser interference fringe projection. By doping, at high concentration, the injected liquid with a fluorescentdye (here fluorescein) a fluorescence signal can be generated very close to the liquid surface. Then, this signalis recorded at a backward angle where the incident modulation encodes the information of the third surfacecoordinate for each pixel. The recorded 2D images are phase demodulated using the Continuous WaveletTransform (CWT) and the 3D surface coordinates can be retrieved. In the first part of the presented work,simulated liquid surfaces are considered for parameter optimization of the 3D reconstruction and to evaluatethe CWT implementation. It is found from the simulated results that the optimum fringe projection periodsampling is 4 − 7 pixels. In the second part, the technique is applied for two experimental cases of a pendingdrop and for an onion shaped liquid sheet. To conclude, both the simulated and experimental results showpromising 3D reconstructions of liquid surfaces providing a new type of data, which in the future can be usedfor the validation of computational models simulating liquid breakup.",
author = "Adrian Roth and Edouard Berrocal",
year = "2019",
month = sep,
day = "2",
language = "English",
booktitle = "ILASS–Europe 2019, Proceedings of the 29th Conference on Liquid Atomization and Spray Systems, 2-4 September 2019, Paris, France",