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The stereoscopic technique applied to Particle Image Velocimetry (PIV) makes it possible to get two-dimensional fields of three-component velocity vectors. Several methods for implementing Stereoscopic Particle Image Velocimetry (SPIV) can be found in the literature; the purpose of the present contribution is to assess quantitatively the measurement accuracy of three such SPIV algorithms: vector warping,...
In order to introduce more flexibility in calibration, the bundle adjustment approach is introduced for Stereo PIV systems in Scheimpflug condition. The calibration target is positionned by hand front of the video-cameras at different locations in space. From the multiple views of the calibration target , the parameters of the video-cameras with both the target locations and the 3D calibration points...
Difficulties are encountered for the study of the flows near walls by stereoscopic PIV. A 3D-calibration method outside the illuminated zone is proposed, using the pinhole camera model. The validation of this calibration is tested for elementary micro-displacements of a sheet of sandpaper. 3D-measurements of the flow around a surface mounted block for a section near the wall are realized and compared...
The production of mono-disperse tracer particles with suitable properties for optical flow investigations , such as small size, spherical shape, smooth surface, appropriate density and diffraction index, non-evaporating and agglomerating, electrically neutral, non-toxic and easily removable, is a challenging task due to the sensitivity of the particle size distribution to the boundary conditions....
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