The dependence of speckle contrast on velocity: A numerical study

Kevin Van As, Bram A. Simons, Chris R. Kleijn, Sasa Kenjeres, Nandini Bhattacharya*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
81 Downloads (Pure)

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.

Original languageEnglish
Pages (from-to)174-180
Number of pages7
JournalJournal of the European Optical Society-Rapid Publications
Volume18
Issue number2
DOIs
Publication statusPublished - 2022

Keywords

  • Mie theory
  • Numerical simulation
  • Speckle interferometry
  • Velocimetry

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