| Issue |
J. Eur. Opt. Society-Rapid Publ.
Volume 18, Number 2, 2022
|
|
|---|---|---|
| Article Number | 11 | |
| Number of page(s) | 7 | |
| DOI | https://doi.org/10.1051/jeos/2022010 | |
| Published online | 25 November 2022 | |
Research Article
The dependence of speckle contrast on velocity: a numerical study
1
Faculty of Applied Sciences; Department of Chemical Engineering, Delft University of Technology, 2629 HZ, Delft, The Netherlands
2
JM Burgerscentrum for Fluid Mechanics, 2628 CD, Delft, The Netherlands
3
Faculty of Mechanical, Maritime and Materials Engineering; Department of Precision and Microsystems Engineering, Delft University of Technology, 2628 CD, Delft, The Netherlands
* Corresponding author: n.bhattacharya@tudelft.nl
Received:
14
February
2022
Accepted:
13
October
2022
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.
Key words: Speckle interferometry / Velocimetry / Numerical simulation / Mie theory
© The Author(s), published by EDP Sciences, 2022
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