1. Bettina Heise

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    1. Mentioned In 25 Articles

    2. Correlative infrared optical coherence tomography and hyperspectral chemical imaging

      Correlative infrared optical coherence tomography and hyperspectral chemical imaging
      Optical coherence tomography (OCT) is a high-resolution three-dimensional imaging technique that enables nondestructive measurements of surface and subsurface microstructures. Recent developments of OCT operating in the mid-infrared (MIR) range (around 4 m) lifted fundamental scattering limitations and initiated applied material research in formerly inaccessible fields. The MIR spectral region, however, is also of great interest for spectroscopy and hyperspectral imaging, which allow highly selective and sensitive chemical studies of materials ...
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    3. Frequency-domain optical coherence tomography with undetected mid-infrared photons

      Frequency-domain optical coherence tomography with undetected mid-infrared photons
      Mid-infrared light scatters much less than shorter wavelengths, allowing greatly enhanced penetration depths for optical imaging techniques such as optical coherence tomography (OCT). However, both detection and broadband sources in the mid-IR are technologically challenging. Interfering entangled photons in a nonlinear interferometer enables sensing with undetected photons making mid-IR sources and detectors obsolete. Here we implement mid-infrared frequency-domain OCT based on ultra-broadband entangled photon pairs. We demonstrate 10 m axial ...
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      Mentions: Bettina Heise
    4. Dual-band infrared optical coherence tomography using a single supercontinuum source

      Dual-band infrared optical coherence tomography using a single supercontinuum source
      Recent developments and commercial availability of low-noise and bright infrared (IR) supercontinuum sources initiated intensive applied research in the last few years. Covering a significant part of near- and mid-infrared spectral ranges, supercontinuum radiation opened up unique possibilities and alternatives for the well-established imaging technique of optical coherence tomography (OCT). In this contribution, we demonstrate the development, performance, and maturity of a cost-efficient dual-band Fourier-domain IR OCT system (2 m ...
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    5. Mid-infrared Fourier-domain optical coherence tomography with a pyroelectric linear array

      Mid-infrared Fourier-domain optical coherence tomography with a pyroelectric linear array
      Optical technology in the mid-infrared wavelength range is currently a rapidly developing field initiated by the availability of novel high-power and spatially coherent sources. Non-destructive testing techniques based on these sources are very promising for industrial and medical applications. However, there are still many engineering problems due to the technical challenges and high prices of the optical elements suitable for the mid-infrared region. In this paper, we report the development ...
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    6. 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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    7. 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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    8. 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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    9. 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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    10. 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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    11. 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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    12. 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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  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.