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Regensburg 2013 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 34: Poster: Wetting, Micro and Nano Fluidics

CPP 34.6: Poster

Wednesday, March 13, 2013, 16:30–18:30, Poster C

A new approach to measure the Depth of Correlation in micro-PIV — •Michael Hein1, Bernhard Wieneke2, and Ralf Seemann1,31Department of Experimental Physics, Saarland University, Saarbrücken, Germany — 2LaVision GmbH Göttingen, Germany — 3MPI for Dynamics and Self-Organization, 37073 Göttingen, Germany

In recent years micro-particle image velocimetry (micro-PIV) has become the most frequently used tool to measure flow profiles in microfluidics. Micro-PIV uses volume-illumination and imaging of fluorescent tracer particles through a microscope objective. The velocity-vectors are obtained by correlating two images captured shortly after each other. Thus the obtained velocity field depends on all imaged particles within an interrogation window, even on the defocused particles. Accordingly, the system dependent knowledge of the height extension of the measured plane (Depth of Correlation, DOC) is crucial when considering three dimensional flow profiles. We present a novel approach to determine the DOC based on artificial volume data derived with the same optical setup as used for the experiments. Using this method we examine the DOC in dependence of out-of-plane velocity gradients for commonly used microscope objectives.

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