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Particle tracking velocimetry using fast x-ray phase-contrast imaging
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Image of FIG. 1.
FIG. 1.

(Color online) Algorithm for single-particle velocity analysis: [(a) and (b)] time sequence of x-ray phase-contrast images; (c) filtered image of an individual particle on a single frame; (d) determination of the searching window of a subframe, and subimage scanning on the selected searching window; and (e) two-dimensional correlation function from consecutive images, and a final velocity vector.

Image of FIG. 2.
FIG. 2.

(Color online) Velocity reconstruction by an axisymmetric tomography: (a) raw image by x-ray phase-contrast imaging, (b) number density distribution of particles for velocity reconstruction along , (c) projected axial velocity profile along the direction amassed with 240 frames, and (d) reconstructed axial velocity profile compared with analytical solution.

Image of FIG. 3.
FIG. 3.

(Color online) Particle size effect on velocity profile: (a) distributions of particle density along the radial direction of the flow, (b) projection axial velocities, and (c) reconstructed axial velocities.

Image of FIG. 4.
FIG. 4.

(Color online) Interaction flow of small fluid particles around a big particle: comparison between (a) visible light image and (b) x-ray phase-contrast image, and (c) projected velocity profile of the small particles with respect to that for the large particle (dashed line).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Particle tracking velocimetry using fast x-ray phase-contrast imaging