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Sensors 2014, 14(9), 16799-16807;

Doppler-Based Flow Rate Sensing in Microfluidic Channels

Department of Applied Physics, The Benin School of Engineering and Computer Science, The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
Author to whom correspondence should be addressed.
Received: 19 June 2014 / Revised: 9 August 2014 / Accepted: 28 August 2014 / Published: 10 September 2014
(This article belongs to the Special Issue Opto-Microfluidics for Bio Applications)
Full-Text   |   PDF [1102 KB, uploaded 10 September 2014]


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. View Full-Text
Keywords: micro fluidics devices; sensors; velocimetry micro fluidics devices; sensors; velocimetry
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Stern, L.; Bakal, A.; Tzur, M.; Veinguer, M.; Mazurski, N.; Cohen, N.; Levy, U. Doppler-Based Flow Rate Sensing in Microfluidic Channels. Sensors 2014, 14, 16799-16807.

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