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Issue 24, 2012
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Optical non-contact localization of liquid-gas interfaces on disk during rotation for measuring flow rates and viscosities

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Abstract

We present a novel technique for the spatio-temporally resolved localization of liquid-gas interfaces on centrifugal microfluidic platforms based on total internal reflection (TIR) at the channel wall. The simple setup consists of a line laser and a linear image sensor array mounted in a stationary instrument. Apart from identifying the presence of usually unwanted gas bubbles, the here described online meniscus detection allows to measure liquid volumes with a high precision of 1.9%. Additionally, flow rates and viscosities (range: 1–12 mPa s, precision of 4.3%) can be sensed even during rotation at frequencies up to 30 Hz.

Graphical abstract: Optical non-contact localization of liquid-gas interfaces on disk during rotation for measuring flow rates and viscosities

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Publication details

The article was received on 24 Jul 2012, accepted on 10 Oct 2012 and first published on 11 Oct 2012


Article type: Paper
DOI: 10.1039/C2LC40842B
Citation: Lab Chip, 2012,12, 5231-5236
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    Optical non-contact localization of liquid-gas interfaces on disk during rotation for measuring flow rates and viscosities

    J. Hoffmann, L. Riegger, F. Bundgaard, D. Mark, R. Zengerle and J. Ducrée, Lab Chip, 2012, 12, 5231
    DOI: 10.1039/C2LC40842B

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