Sub-diffusion flow velocimetry with number fluctuation optical coherence tomography

K. Cheishvili*, J. Kalkman

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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We have implemented number fluctuation dynamic light scattering optical coherence tomography (OCT) for measuring extremely slow, sub-diffusion flows of dilute particle suspensions using the second-order autocovariance function. Our method has a lower minimum measurable velocity than conventional correlation-based OCT or phase-resolved Doppler OCT, as the velocity estimation is not affected by the particle diffusion. Similar to non-dilute correlation-based OCT, our technique works for any Doppler angle. With our analysis we can quantitatively determine the concentration of particles under flow. Finally, we demonstrate 2D sub-diffusion flow imaging with a scanning OCT system at high rate by performing number fluctuation correlation analysis on subsequent B-scans
Original languageEnglish
Pages (from-to)3755-3773
JournalOptics Express
Issue number3
Publication statusPublished - 2023


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