The dependence of speckle contrast on velocity
A numerical study
Kevin Van As (TU Delft - Applied Sciences)
Bram A. Simons (Student TU Delft)
Chris R. Kleijn (TU Delft - Applied Sciences)
Sasa Kenjeres (TU Delft - Applied Sciences)
Nandini Bhattacharya (TU Delft - ImPhys/Medical Imaging, TU Delft - Mechanical Engineering)
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Abstract
We study how the speckle contrast depends on scatterer velocity, with the goal of further developing laser speckle imaging as a quantitative measurement technique. To that end, we perform interferometric computer simulations on a dilute plug flow. The results of our numerical experiment, that we compare with known analytical expressions to confirm their veracity, match well at low velocities with the Gaussian expression. Finally, we address the issue of how velocity depends on speckle decorrelation time, and show that the speckle size is most likely the relevant connecting length scale.
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