1. Bettina Heise

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    1. Mentioned In 21 Articles

    2. Full-field optical coherence tomography in a balanced detection mode

      Full-field optical coherence tomography in a balanced detection mode
      We discuss balanced time-domain full-field optical coherence tomography (FF-OCT) realized in a MachZehnder configuration. The balanced detection scheme and spatial phase shifting allow single-shot acquisition and reconstruction in FF-OCT. Combined with a 2D quadrature signal-based demodulation technique applying the Riesz transform, previously illustrated for a dual-shot temporal phase shifting in FF-OCT, we demonstrate the concept for single-shot spatial phase shifting. The monitoring of dynamic processes by time-domain FF-OCT is enabled ...
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    3. Feature Of The Week 5/25/14: Exploiting Advanced Low Coherence Interferometric Imaging Techniques for Material Research Applications

      Feature Of The Week 5/25/14: Exploiting Advanced Low Coherence Interferometric Imaging Techniques for Material Research Applications
      ...the progress of special corrosion processes, like filiform corrosion.For more information see [4,5]. Courtesy Bettina Heise from the Johannes Kepler University of Linz. References:[1] Heise, B. et al., Full Field Opt...
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    4. 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 ...
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    5. 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 stressstrain fields and optical anisotropies can be visualized with high resolution, as exemplified for various technical material applications.
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    6. In-Situ Optical Coherence Tomography (OCT) for the Time-Resolved Investigation of Crystallization Processes in Polymers

      In-Situ Optical Coherence Tomography (OCT) for the Time-Resolved Investigation of Crystallization Processes in Polymers
      Optical coherence tomography (OCT) is a low-coherence interferometric imaging method which was developed in the 1990s prevalently in the area of biomedical diagnostics. (1) It generates depth scans of samples in a contact-free, nondestructive manner. Having become a standard method for ophthalmologic examinations, (2, 3) within the past decade also applications outside the medical field were found, as summarized in a recent review (4) and with a special focus put ...
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    7. Feature Of The Week 1/6/13: Johannes Kepler University Linz Investigates Full-Filed Optical Coherence Microscopy For Dynamic Imaging

      Feature Of The Week 1/6/13: Johannes Kepler University Linz Investigates Full-Filed Optical Coherence Microscopy For Dynamic Imaging
      The observation of internal dynamic processes is a crucial task in biomedicine as well as for material sciences, with full-field optical coherence microscopy (FF-OCM) exhibiting advantageous features: the full image content is taken at once at a defined depth position with a high lateral resolution. Usually two-dimensional (2D) CCD detectors are applied or - for high speed FF-OCM imaging - complementary metal oxide semiconductor (CMOS) cameras. Besides a fast optical acquisition setup ...
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    8. 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 ...
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    9. 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 ...
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    10. Spectral domain polarization sensitive optical coherence tomography at 1.55 μm: novel developments and applications for dynamic studies in materials science

      Spectral domain polarization sensitive optical coherence tomography at 1.55 μm: novel developments and applications for dynamic studies in materials science
      ... internal stress situation is obtained in a spatially resolved way. David Stifter, Elisabeth Leiss-Holzinger, Bettina Heise, Jean-Luc Bouchot, Zoltan Major, Michael Pircher, Erich Götzinger, Bernhard Baumann and Christop...
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    11. 1-15 of 21 1 2 »
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  2. About Bettina Heise

    Bettina Heise

    Bettina Heise is a researcher Christian Doppler Laboratory for Microscopic and Spectroscopic Material Characterization and Department of Knowledge-Based Mathematical Systems at Johannes Kepler University Linz.