Berlin 2005 – scientific programme

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Q: Quantenoptik und Photonik

Q 46: Optische Meßtechnik & Präzisionsmessungen I

Q 46.2: Talk

Tuesday, March 8, 2005, 14:15–14:30, HU 2002

Application of a photorefractive novelty filter for micro-fluid flow visualization and analysis — •Oliver Grothe, Vishnu Vardhan Krishnamachari, Hendrik Deitmar, and Cornelia Denz — Institut für Angewandte Physik, Westfälische Wilhelms-Universität Münster, Corrensstrasse 2/4, 48149 Münster

Of late there has been growing interest in studying the flow properties in micro-fluidic devices which are often used in mixing, sorting and cell culturing in many biological and chemical applications [1]. To understand the flows in this micro-scale regime, efficient diagnostic tools have to be developed which are non-invasive and reliable. In this contribution, we present an optical, non-invasive, photorefractive-based novelty filter [2] system which can be used for direct visualization and measurement of changes in the concentration of two mixing transparent fluids in a micro-channel. We show that, with this system, concentration changes as small as 0.1% can be detected in real-time. We also demonstrate that the time constants of the order of a few hundred milliseconds to a few days can be achieved thus making it suitable for applications involving the observation of fast processes (eg: jet flows) as well as slow processes (eg: cell mutations).

[1]. Shinohara K., et al., Meas. Sci. Technol. 15 (2004) 1965-1970 (and the references therein).

[2]. Anderson D. Z. and Feinberg J., IEEE J. Quant. Electron. 25 (1989) 635-647.