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Reconstruction of curved particle streak trajectories
Publikationstyp
Journal Article
Date Issued
2008-11-10
Sprache
English
Author(s)
Institut
Volume
15
Issue
4
Start Page
313
End Page
327
Citation
Journal of Flow Visualization and Image Processing 15 (4): 313-327 (2008-11-10)
Publisher DOI
Scopus ID
Publisher
Begell House Inc.
We present a method for reconstructing curved particle trajectories from particle streak velocimetry. The reflection properties of a particle are modeled as a point light source. The mapping of the particle on the image is spread by the point spread function of the camera lens. Therefore we can model the mapped particle trajectory as a convolution of the resting particle with its trajectory. Here we model the particle trajectory as a two-dimensional, symmetric Gaussian function convolved with a Bézier curve as an approximation of the trajectory with the pixel aperture of the camera. We assume that the velocity of the particle is constant over the measurement period. We will show that the particle trajectory can be reconstructed up to sub-pixel accuracy. This is verified with synthetic particle trajectories and qualitative comparisons with real world measurements.
Subjects
Airflow
Optimization
Particle streak velocimetry
Reconstruction
Streak
Two-dimensional
DDC Class
600: Technik