Experiments in Fluids

, Volume 44, Issue 3, pp 419–430 | Cite as

Micro-flow analysis by molecular tagging velocimetry and planar Raman-scattering

  • Karsten RoetmannEmail author
  • Waldemar Schmunk
  • Christoph S. Garbe
  • Volker Beushausen
Research Article


The two dimensional molecular tagging velocimetry (2D-MTV) has been used to measure velocity fields of the flow in a micro mixer. Instead of commonly used micro particles an optical tagging of the flow has been performed by using a caged dye. The pattern generation is done by imaging a mask for the first time. This allows to generate nearly any imaginable pattern. The flow induces a deformation of the optically written pattern that can be tracked by laser induced fluorescence. The series of raw images acquired in this way were analyzed quantitatively with a novel optical flow based technique. The reference measurements have been carried out allowing to draw conclusions about the accuracy of this procedure. A comparison to the standard technique of μPIV has also been conducted. Apart from measuring flow velocities in microfluidic mixing processes, the spatial distribution of concentration fields for different species has also been measured. To this end, a new technique has been developed that allows spatial measurements from Planar Spontaneous Raman Scattering (PSRS). The Raman stray light of the relevant species has been spectrally selected by a narrow bandpass filter and thus detected unaffectedly by the Raman stray light of other species. The successful operation of this measurement procedure in micro flows will be demonstrated exemplary for a mixing process of water and ethanol.


Vector Field Optical Flow Microfluidic System Velocity Vector Field Raman Imaging 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The Authors thank the German Research Community (Deutsche Forschungsgemeinschaft-DFG) for funding of the project in the framework of the DFG-program “Imaging techniques for flow analysis” (“Bildgebende Messvervahren für die Strömungsanalyse”, SPP 1147) as well as in the priority program “Mathematical methods for time series analysis and digital image processing”, SPP 1114.


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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Karsten Roetmann
    • 1
    Email author
  • Waldemar Schmunk
    • 1
  • Christoph S. Garbe
    • 2
  • Volker Beushausen
    • 1
  1. 1.Laser-Laboratorium Göttingen e.V.GöttingenGermany
  2. 2.Interdisciplinary Center for Scientific Computing (IWR)University of HeidelbergHeidelbergGermany

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