1. Articles from B. Heise

    1-6 of 6
    1. The influence of glass fibers on elongational viscosity studied by means of optical coherence tomography and X-ray computed tomography

      The influence of glass fibers on elongational viscosity studied by means of optical coherence tomography and X-ray computed tomography

      We report on the flow characteristics of glass-fiber-reinforced polymers in elongational rheometry. Unlike polymers with geometrically isotropic fillers, glass-fiber-reinforced polymers exhibit flow behavior and rheology that depend heavily on the orientation, the length distribution and the content of the fibers. One of the primary objectives of this study was to determine the effect of fiber orientation, concentration and distribution on the entrance pressure drop by means of optical coherence tomography (OCT), full-field optical coherence microscopy (FF-OCM), and X-ray computed tomography (X-CT). Both pressure drop and melt flow were analyzed using a special elongation die (Thermo Scientific X-Die [3]) for inline ...

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    2. Simultaneous detection of optical retardation and axis orientation by polarization-sensitive full-field optical coherence microscopy for material testing

      Simultaneous detection of optical retardation and axis orientation by polarization-sensitive full-field optical coherence microscopy for material testing

      We present a polarization-sensitive full-field optical coherence microscopy modality which is capable of simultaneously delivering depth resolved information on the reflectivity, optical retardation and optical axis orientation. In this way local birefringence, inherent stress–strain fields and optical anisotropies can be visualized with high resolution, as exemplified for various technical material applications.

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    3. Evaluation of structural change and local strain distribution in polymers comparatively imaged by FFSA and OCT techniques

      Evaluation of structural change and local strain distribution in polymers comparatively imaged by FFSA and OCT techniques

      Mechanical material testing combined with optical coherence tomography (OCT) allows for the first time the immediate detection of inner structural changes along with a qualitative observation of the local strain distribution in surface near bulk regions of semitransparent and translucent specimens. In addition to a 3D full field strain analysis (FFSA) system based on digital image correlation (DIC), a customized spectral domain OCT system operating at 1550 nm was applied for investigation. Exemplified by tensile testing of elastomer particle filled polypropylene specimens, local dissimilarity evaluation of the OCT images was performed. The results show the high potential of OCT to ...

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    4. Spatially resolved stress measurements in materials with polarization-sensitive optical coherence tomography: image acquisition and processing aspects.

      Spatially resolved stress measurements in materials with polarization-sensitive optical coherence tomography: image acquisition and processing aspects.
      We demonstrate that polarization-sensitive optical coherence tomography (PS-OCT) is suitable to map the stress distribution within materials in a contactless and non-destructive way. In contrast to transmission photoelasticity measurements the samples do not have to be transparent but can be of scattering nature. Denoising and analysis of fringe patterns in single PS-OCT retardation images are demonstrated to deliver the basis for a quantitative whole-field evaluation of the internal stress state of samples under investigation.
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    5. Spatially Resolved Stress Measurements in Materials With Polarisation-Sensitive Optical Coherence Tomography: Image Acquisition and Processing Aspects

      Spatially Resolved Stress Measurements in Materials With Polarisation-Sensitive Optical Coherence Tomography: Image Acquisition and Processing Aspects
      We demonstrate that polarisation-sensitive optical coherence tomography (PS-OCT) is suitable for mapping the stress distribution within materials in a contact-free and non-destructive way. In contrast to transmission photoelasticity measurements, the samples do not have to be transparent but can be of scattering nature. Denoising and analysis of fringe patterns in single PS-OCT retardation images are demonstrated to be the bases for a quantitative whole-field evaluation of the internal stress state of samples under investigation.
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    6. Spatially Resolved Stress Measurements in Materials with Polarisation-Sensitive Optical Coherence Tomography: Image Acquisition and Processing Aspects

      Abstract: We demonstrate that polarisation-sensitive optical coherence tomography (PS-OCT) is suitable for mapping the stress distribution within materials in a contact-free and non-destructive way. In contrast to transmission photoelasticity measurements, the samples do not have to be transparent but can be of scattering nature. Denoising and analysis of fringe patterns in single PS-OCT retardation images are demonstrated to be the bases for a quantitative whole-field evaluation of the internal stress state of samples under investigation.
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    1-6 of 6
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  2. Topics in the News

    1. (6 articles) Johannes Kepler University of Linz
    2. (6 articles) David Stifter
    3. (6 articles) Bettina Heise
    4. (3 articles) Medical University of Vienna
    5. (3 articles) Michael Pircher
    6. (3 articles) Karin Wiesauer
    7. (3 articles) Erich Götzinger
    8. (3 articles) Christoph K. Hitzenberger
    9. (2 articles) Upper Austrian Research GmbH
    10. (2 articles) Michael Leitner
    11. (1 articles) Nicolaus Copernicus University
    12. (1 articles) Centre Hospitalier Intercommunal de Créteil
    13. (1 articles) National Institutes of Health
    14. (1 articles) University of Kent
    15. (1 articles) UC Davis
    16. (1 articles) David D. Sampson
    17. (1 articles) Adrian G. Podoleanu
    18. (1 articles) Eric H. Souied
    19. (1 articles) Optopol Technology
    20. (1 articles) Carl Zeiss Meditec
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    Spatially resolved stress measurements in materials with polarization-sensitive optical coherence tomography: image acquisition and processing aspects. Spatially Resolved Stress Measurements in Materials With Polarisation-Sensitive Optical Coherence Tomography: Image Acquisition and Processing Aspects Evaluation of structural change and local strain distribution in polymers comparatively imaged by FFSA and OCT techniques Simultaneous detection of optical retardation and axis orientation by polarization-sensitive full-field optical coherence microscopy for material testing The influence of glass fibers on elongational viscosity studied by means of optical coherence tomography and X-ray computed tomography Spectral-Domain Optical Coherence Tomography Findings in Patients With Macropsia Evaluation of retinal microvascular density in patients affected by systemic lupus erythematosus: an optical coherence tomography angiography study Professor Andrzej Kowalczyk Celebration Gala Optical coherence tomography angiography features of choroidal neovascularization secondary to angioid streaks Early restenosis of resorbable magnesium scaffolds: Optical coherence tomography findings Intraoperative imaging of surgical margins of canine soft tissue sarcoma using optical coherence tomography Optic nerve head morphology in primary open‐angle glaucoma and nonarteritic anterior ischaemic optic neuropathy measured with spectral domain optical coherence tomography