Dynamic phase-contrast stereoscopy for microflow velocimetry
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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.
PACS42.40.Kw 47.61.-k 47.80.Cb
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- 2.O. Geschke, H. Klank, P. Tellman (eds.), Microsystem Engineering of Lab-on-a-Chip Devices (Wiley, New York, 2004) Google Scholar
- 26.F. Holtmann, M. Woerdemann, C. Denz, Nonlinear dynamic phase contrast microscopy for microflow analysis, in Imaging Measurement Methods for Flow Analysis (Springer, Berlin, 2009) Google Scholar
- 29.P. Yeh, Introduction to Photorefractive Nonlinear Optics (Wiley, New York, 1993) Google Scholar