Non-intrusive measurement of complex free surfaces using Laser Induced Fluorescence and stereo imaging

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Abstract

A quasi three-dimensional stereo-camera measurement technique has been devised that is able to measure liquid free surface profiles, by scanning a light sheet. The technique will be applied to study the variability of impact pressure observed during wave impact in a newly developed experimental set-up. The set-up imposes severe optical (single window) and accessibility (autoclave) constraints. The devised measurement technique is required to measure liquid free surface profiles over a domain of (X,Y,Z) = (100, 100,100) mm domain with an accuracy of 1 mm. The performance of the devised measurement technique is evaluated using a convential side-view measurement (Buckley et al 2017) in the water tunnel of the Laboratory for Aero- and Hydrodynamics at the Delft University of Technology. A free surface profile is generated by flow over a bump geometry (Gui et al 2014), which provides a repeatable and increasingly complex free surface profile. The free surface profile is determined for three different cases over a domain of (X,Y,Z) = (170, 100, 62) mm with an averaged systematic error of 2.7 ± 1.2 mm. The observed error is systematic and implies that the edge detection procedure is not robust enough. In future work the systems measurement frequency and edge detection procedure will be improved.
Original languageEnglish
Title of host publicationProceedings of the 19th International Symposium on Application of Laser and Imaging Techniques to Fluid Mechanics
Place of PublicationLisboa, Portugal
PublisherInstituto Superior Técnico
Pages821-832
Publication statusPublished - 2018
EventLXLASER2018: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics - Lisbon, Portugal
Duration: 16 Jul 201819 Jul 2018
Conference number: 19
http://www.lisbon-lasersymposium.org/LXLASER2018

Conference

ConferenceLXLASER2018: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
Abbreviated titleLXLASER2018
CountryPortugal
CityLisbon
Period16/07/1819/07/18
Internet address

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