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Proceedings 2017, 1(4), 498;

Flow-Ratio Monitoring in a Microchannel by Liquid-Liquid Interface Interferometry

Institute for Microsensors, -actuators and -systems (IMSAS), University of Bremen, 28359 Bremen, Germany
Microsystems Center Bremen (MCB), Bremen, Germany
Presented at the Eurosensors 2017 Conference, Paris, France, 3–6 September 2017.
Author to whom correspondence should be addressed.
Published: 30 August 2017
(This article belongs to the Proceedings of Eurosensors 2017)
PDF [1193 KB, uploaded 30 August 2017]


A new method to monitor the relative flow rates of two different liquids in a microchannel is presented. By using a simple out-of-plane interferometer setup, shifts in the position of the interface between the two liquids can be determined. This label-free and real-time approach to observe the interface position yields the ratio of the flow rates. Applying an out-of-plane geometry allows the use of a flexible setup of chip-external optical components such as a laser and an image sensor, which is an advantage over fixed in-plane optics. With this measurement method we are able to monitor a change of about 1% of the relative flow rate between two fluidic inlets.
Keywords: optofluidic reconfigurable interferometer; liquid-liquid interface; micromixer optofluidic reconfigurable interferometer; liquid-liquid interface; micromixer
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Oellers, M.; Bunge, F.; Vinayaka, P.; Driesche, S.; Vellekoop, M.J. Flow-Ratio Monitoring in a Microchannel by Liquid-Liquid Interface Interferometry. Proceedings 2017, 1, 498.

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