1. Johannes Kepler University of Linz

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    1. Mentioned In 40 Articles

    2. Conference on Optical Methods for Inspection, Characterization and Imaging of Biomaterials, Munich Germany May 13th, 2013

      Conference on Optical Methods for Inspection, Characterization and Imaging of Biomaterials, Munich Germany May 13th, 2013
      Submission for postdeadline papers still open (till end of January). Biocompatible materials (or Biomaterials) are substances that are intended to interact with biological systems. For the safe and reliable function of implants, materials are as important as form. Surfaces may require appropriate coatings or functionalization. Therefore the last two decades have seen strong advancements in biomaterials and related science, with capital investments and research efforts into the development of new ...
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    3. 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
      ...odulation scheme. Below is a summary of the latest work with respect to FF-OCM imaging, by researchers at the Johannes Kepler University Linz (CDL-MS-MACH) and TU Bergakademie Freiberg. By using a demodulation scheme bas...
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    4. 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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    5. 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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    6. Contrast modification for ultra-high resolution low-coherence interference microscopy by Fourier-plane filtering

      Contrast modification for ultra-high resolution low-coherence interference microscopy by Fourier-plane filtering
      We present a novel full-field low-coherence interference (LCI) microscope, which exhibits ultra-high axial resolution due to a broadband super continuum light source and which is at the same time capable to generate different contrast modes by using Fourier-plane filtering with a spatial light modulator. By changing the phase and spatial frequencies of the backreflected wavefront of the specimen in the sample arm of the interferometer, we are able to change ...
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    7. Coherence Probe Microscopy Imaging and Analysis for Fiber-Reinforced Polymers

      Coherence Probe Microscopy Imaging and Analysis for Fiber-Reinforced Polymers
      The potential of full-field low coherence interferometric techniques for imaging internal structures, such as fibers, interfaces, or inclusions in technical materials is demonstrated by our coherence probe microscopy (CPM) setup. However, the huge amount of recorded data demand for an automatized enhancement and evaluation of the image data. We propose an automatic image analysis procedure adapted for full-field coherence probe microscopy, which we tested on fiber composite materials. The performed ...
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    8. 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
      In this paper it is demonstrated, how research in optical coherence tomography (OCT) for biomedical diagnostics successfully triggered new developments in the field of mechanical material testing. With the help of a specifically designed, compact and robust spectral domain polarization sensitive OCT (SD-PS-OCT) setup, which is operating at 1.55 μm, dynamic investigations of technical materials - like bulk polymers and composite samples - can be performed under various conditions. Already by ...
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    9. Feature Of The Week 1/23/11: Austrian Researchers Continue to Push the Envelope for the Application of OCT in Non-Destructive Evaluation and Testing

      Feature Of The Week 1/23/11: Austrian Researchers Continue to Push the Envelope for the Application of OCT in Non-Destructive Evaluation and Testing
      ...ound to change as researchers continue to explore this area.  Some recent work by Austrian researchers at the Johannes Kepler University Linz, Medical University of Vienna, and RECENDT GmbH showed the power of OCT in thi...
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    10. Flexible contrast for low-coherence interference microscopy by Fourier-plane filtering with a spatial light modulator

      Flexible contrast for low-coherence interference microscopy by Fourier-plane filtering with a spatial light modulator
      We propose a full-field low-coherence interference (LCI) microscope that can provide different contrast modes using Fourier-plane filtering by means of a spatial light modulator. By altering the phase and spatial frequencies of the backreflected wavefront from the sample arm of the interferometer, we are able to change the contrast in the depth-resolved LCI images. We demonstrate that different types of contrast modes, such as, e.g., spiral phase contrast, can ...
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    11. Dynamic optical studies in materials testing with spectral-domain polarization-sensitive optical coherence tomography

      Dynamic optical studies in materials testing with spectral-domain polarization-sensitive optical coherence tomography
      By combining dynamic mechanical testing with spectral-domain polarization-sensitive optical coherence tomography (SD-PS-OCT) performed at 1550 nm we are able to directly investigate for the first time changes within scattering technical materials during tensile and fracture tests. Spatially and temporally varying polarization patterns, due to defects and material inhomogeneities, were observed within bulk polymer samples and used to finally obtain – with the help of advanced image processing algorithms – quantitative maps of ...
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    12. 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
      ...resist technology GmbH, Köpenicker Str. 325, 12555 Berlin, Germany ZONA-Center for Surface and Nanoanalytics, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria phase unwrapping; photomechanics; p...
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    13. OCT aims for industrial application

      OCT aims for industrial application
      The speed, precision, and cost benefits of optical coherence tomography are beginning to attract the interest of industrial end users. For detailed subsurface imaging of small, semiopaque 2-D surface areas or 3-D structures, OCT is just the thing. When optical coherence tomography (OCT) was introduced in the early 1990s, it was immediately recognized for its ability to produce high-resolution, depth-resolved imagery of biological tissue. Its impact on ophthalmology is evident ...
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    14. Applicability of Optical Coherence Tomography at 1.55 μm to the Examination of Oil Paintings

      Applicability of Optical Coherence Tomography at 1.55 μm to the Examination of Oil Paintings
      With 47 samples of commercially available oil paints, the applicability of Optical coherence tomography to noninvasive tomography of paint layers was examined. Two different instruments, utilizing near-infrared light with central wavelength of 823nm and, for the first time, 1.55 μm, were used to obtain cross-sectional images. Example tomograms are given; a ray tracing correction of images is also discussed. The tests revealed that applicability of OCT is limited to ...
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    15. An investigation of the accelerated thermal degradation of different epoxy resin composites using x-ray micro computed tomography and optical coherence tomography

      Epoxy resin composites reinforced with hollow glass microspheres, microlight microspheres, 3D parabeam glass, and E-Glass individually were subjected to accelerated thermal degradation conditions. X-ray micro computed tomography (XμCT) was used to evaluate density changes, reinforcement filler damage, homogeneity, cracks and microcracks in the bulk of the different epoxy resin composites. XμCT 3D images, 2D reconstructed images and voids calculations revealed microspheres damage, filler distributions and showed cracks in all composites ...
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  2. About Johannes Kepler University of Linz

    Johannes Kepler University of Linz

    Johannes Kepler University of Linz is an impulse center for science and the community and prides itself on a very distinguished international reputation. The university is the largest academic institution in the federal state of Upper Austria. The university’s core areas include the Social Sciences, Economics and Business, Law as well as Engineering and Natural Sciences.