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Dynamic phase-contrast stereoscopy for microflow velocimetry

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Abstract

A nonlinear dynamic phase-contrast stereoscope has been developed for the measurement of all three velocity components of a microfluidic flow field. The stereoscope system captures simultaneously two images of different off-axis views of the same region of interest in a microflow, seeded with tracer particles. Two independent photorefractive two-beam coupling novelty filters, one in each stereoscope channel, are employed to enhance the contrast of tracer particle images. A subsequently applied particle tracking algorithm extracts the velocity information from the images, and in first experiments the axial velocity components could be determined with an error of less than 5%. Finally we report on the determination of the velocity field in a rectangular microchannel with a 170 μm high microstep with the dynamic phase-contrast stereoscope.

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Authors and Affiliations

  1. Institut für Angewandte Physik, Westfälische Wilhelms-Universität Münster, Corrensstraße 2/4, 48149, Münster, Germany

    F. Holtmann, M. Oevermann & C. Denz

Authors
  1. F. Holtmann
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  2. M. Oevermann
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  3. C. Denz
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Correspondence to F. Holtmann.

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Holtmann, F., Oevermann, M. & Denz, C. Dynamic phase-contrast stereoscopy for microflow velocimetry. Appl. Phys. B 95, 633–636 (2009). https://doi.org/10.1007/s00340-009-3500-5

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  • DOI: https://doi.org/10.1007/s00340-009-3500-5

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