Journal
MICROFLUIDICS AND NANOFLUIDICS
Volume 12, Issue 1-4, Pages 165-174Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10404-011-0860-z
Keywords
Micro-optics; PDMS; Lab on a Chip; Bubble flow detection
Funding
- GIC-SERV
- ICTS of the Spanish Minister of Science and Innovation
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This article presents a polymeric micro-optical system that consists of two coupled miniaturized devices for spatially distributed characterization of microfluidic two-phase phenomena exploiting multiwavelength optical signals. The input device implements four optical windows (slits) which are superimposed on the centerline of a microfluidic serpentine channel and illuminate specific locations of the microchannel. The flow-related information is then collected by an ad hoc polymeric micro-optical output device that guides and merges the spatially distributed information into a single output signal, which maintains memory of the spatial coordinates by using the wavelengths as fingerprints of the slits' position in the microfluidic channel. Both micro-optical devices were designed, simulated, and characterized in static and dynamic conditions. Experiments on two-phase (air and ethanol) flow were carried out by applying constant and periodic flow rate functions. In both cases, the system was proved to be efficient in capturing the spatial-temporal dynamics of flow profiles.
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