A novel flow-visualization/digital-image-analysis technique to obtain quantitative information on individual mono-dispersed silica-sand particle motions in a wind-generated turbulent boundary-layer has been developed and implemented. The technique involves recording particle trajectories, which have been illuminated with a strobed plane of light generated via a He-Ne laser, on 35 mm black and white film with a 35 mm SLR camera, converting the negatives into 512 × 512 digital images, enhancing the images via Fast Fourier Transforms, extracting ‘dashed’ particle lines and then linking the lines together to reconstruct the particle trajectory. The result is a Lagrangian description of the particle path of flight, obtained with the aid of the basic principles of computer vision/artificial intelligence.
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Ciccone, A.D., Kawall, J.G. & Keffer, J.F. Flow visualization/digital image analysis of saltating particle motions. Experiments in Fluids 9, 65–73 (1990). https://doi.org/10.1007/BF00575337
- Fourier Transform
- Digital Image
- Basic Principle
- Fast Fourier Transform
- Quantitative Information