Optical coherence tomography based particle image velocimetry (OCT-PIV) of polymer flows
Sprache des Titels:
Englisch
Original Kurzfassung:
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 obtainedby
Doppler-OCT. Overall, this new technique(OCT-PIV)represents an important extension of PIV to turbid
materials by the use of OCT.
Forschungs-