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Optical coherence tomography based particle image velocimetry (OCT-PIV) of polymer flows.

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Title: Optical coherence tomography based particle image velocimetry (OCT-PIV) of polymer flows.
Authors: Buchsbaum, A1 andreas.buchsbaum@recendt.at, Egger, M1, Burzic, I2, Koepplmayr, T2,3, Aigner, M2, Miethlinger, J2, Leitner, M1
Source: Optics & Lasers in Engineering. Jun2015, Vol. 69, p40-48. 9p.
Subjects: Velocity measurements, Fluid dynamic measurements, Fluid velocity measurements, Cross-sectional imaging, Simulation methods & models
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. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
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. [ABSTRACT FROM AUTHOR]
ISSN:01438166
DOI:10.1016/j.optlaseng.2015.02.003