Doppler-based flow rate sensing in microfluidic channels

Liron Stern, Avraham Bakal, Mor Tzur, Maya Veinguer, Noa Mazurski, Nadav Cohen, Uriel Levy*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


We design, fabricate and experimentally demonstrate a novel generic method to detect flow rates and precise changes of flow velocity in microfluidic devices. Using our method we can measure flow rates of ~2 mm/s with a resolution of 0.08 mm/s. The operation principle is based on the Doppler shifting of light diffracted from a self-generated periodic array of bubbles within the channel and using self-heterodyne detection to analyze the diffracted light. As such, the device is appealing for variety of “lab on chip” bio-applications where a simple and accurate speed measurement is needed, e.g., for flow-cytometry and cell sorting.

Original languageAmerican English
Pages (from-to)16799-16807
Number of pages9
Issue number9
StatePublished - 10 Sep 2014

Bibliographical note

Publisher Copyright:
© 2014 by the authors; licensee MDPI, Basel, Switzerland.


  • Micro fluidics devices
  • Sensors
  • Velocimetry


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