An improved, free surface, topographic technique |
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Authors: | A Fouras K Hourigan M Kawahashi H Hirahara |
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Institution: | (1) Division of Biological Engineering, Faculty of Engineering, Monash University, Clayton Campus, Melbourne, VIC, 3800, Australia;(2) Department of Mechanical and Aerospace Engineering, Faculty of Engineering, Monash University, Clayton Campus, Melbourne, VIC, 3800, Australia; |
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Abstract: | Current techniques of water wave visualization such as shadowgraphy and stereo photography are widely used but are deficient
in many aspects. Refraction based visualization observes the bending of light as it traverses across a liquid-air interface.
This work describes the continued development of techniques to measure the surface height of a liquid free surface. The method,
Reference Image Topography, utilizes refraction of light at the free surface as a function of the local angle of that surface.
Particle Image Velocimetry (PIV) software is used to evaluate apparent dislocations of the target image viewed through the
free surface, which are approximately proportional to the surface angle. High-resolution images are presented of the dynamic
surface topography for a point source and the shallow water flow around a vertical cylinder. |
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Keywords: | |
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