Applied Physics B

, Volume 95, Issue 3, pp 633–636

Dynamic phase-contrast stereoscopy for microflow velocimetry

Authors

    • Institut für Angewandte PhysikWestfälische Wilhelms-Universität Münster
  • M. Oevermann
    • Institut für Angewandte PhysikWestfälische Wilhelms-Universität Münster
  • C. Denz
    • Institut für Angewandte PhysikWestfälische Wilhelms-Universität Münster
Article

DOI: 10.1007/s00340-009-3500-5

Cite this article as:
Holtmann, F., Oevermann, M. & Denz, C. Appl. Phys. B (2009) 95: 633. doi:10.1007/s00340-009-3500-5
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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.

PACS

42.40.Kw47.61.-k47.80.Cb
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© Springer-Verlag 2009