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A simple opto-fluidic switch detecting liquid filling in polymer-based microfluidic systems

Bundgaard, F. and Geschke, O. and Zengerle, Roland and Ducrée, Jens (2007) A simple opto-fluidic switch detecting liquid filling in polymer-based microfluidic systems. In: TRANSDUCERS 2007 - International Solid-State Sensors, Actuators and Microsystems Conference, 10-14 June 2007, Lyon, France. ISBN 1-4244-0842-3

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A novel detection scheme for detection of liquid levels and bubbles in microfluidic systems, using the principle of total internal reflection (TIR) is presented. A laser beam impinges on the side walls of a channel which are inclined at 45deg. In an unfilled channel of such a "V-groove", TIR deflects the beam by 90deg into a simple light detector. Upon the presence of liquid, the refractive index in the channel changes, thus eliminating deflection by TIR. The detection principle is robust, requiring no calibration, and tolerating alignment errors of the laser larger than the width and depth of the microfluidic channels. The machining of the V-groves can seamlessly be integrated into common polymer microfabrication schemes such as injection molding.

Item Type:Conference or Workshop Item (Paper)
Event Type:Conference
Uncontrolled Keywords:injection moulding; microfluidics; microswitches; refractive index;
Subjects:Biological Sciences > Microfluidics
DCU Faculties and Centres:Research Initiatives and Centres > Biomedical Diagnostics Institute (BDI)
Published in:TRANSDUCERS 2007 - International Solid-State Sensors, Actuators and Microsystems Conference. . Institute of Electrical and Electronics Engineers. ISBN 1-4244-0842-3
Publisher:Institute of Electrical and Electronics Engineers
Official URL:
Copyright Information:©2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
ID Code:15467
Deposited On:14 Jul 2010 14:31 by DORAS Administrator. Last Modified 10 Oct 2016 15:41

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