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Optical coherence tomography based particle image velocimetry (OCT-PIV) of polymer flows |
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| Institution: | 1. Exputec GmbH, Mariahilferstr. 147/2/2D, Vienna, Austria;2. Institute of Bioinformatics, Johannes Kepler University Linz, Altenbergerstr. 69, Linz, Austria;3. Institute of Chemical Engineering, Research Area Biochemical Engineering, Vienna University of Technology, Gumpendorferstr. 1a, Vienna, Austria;4. CD Laboratory on Mechanistic and Physiological Methods for Improved Bioprocesses, Vienna University of Technology, Gumpendorferstr. 1a, Vienna, Austria |
| Abstract: | The measurement of spatially resolved velocity distributions is crucial for modelling flow and for understanding properties of materials produced in extrusion processes. Traditional methods for flow visualization such as particle image velocimetry (PIV) rely on optically transparent media and cannot be applied to turbid polymer melts. Here we present optical coherence tomography as an imaging technique for PIV data processing that allows for measuring a sequence of time resolved images even in turbid media. Time-resolved OCT images of a glass-fibre polymer compound were acquired during an extrusion process in a slit die. The images are post-processed by ensemble cross-correlation to calculate spatially resolved velocity vector fields. The results compared well with velocity data obtained by Doppler-OCT. Overall, this new technique (OCT-PIV) represents an important extension of PIV to turbid materials by the use of OCT. |
| Keywords: | Optical coherence tomography Particle image velocimetry Extrusion Flow visualization Doppler optical coherence tomography |
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