1. Articles from Karin Wiesauer

    1-8 of 8
    1. 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 with different shapes and volume in response to the thermal degradation conditions. In addition, expansion of air bubbles/voids was observed and recorded in the microsphere and microlight epoxy composite ...
      Read Full Article
    2. Masmicro micro-/nano-materials processing, analysis, inspection and materials knowledge management

      Abstract  The main goals of the ‘Material Innovation and Testing’ within MASMICRO are the identification of the miniature/micro-materials which are formable, development of new materials for forming and machining, development of an integrated material-testing system and study of material properties for design/analysis applications. Examples of collaborative work and results are presented regarding the processing of functional electrospun polymer micro-/nano-fibre structures and the characterization of their interface properties with tribological testing. By means of optical coherence tomography, a non-destructive inspection approach for these micro-/nano-structured webs was developed and it is also documented in the paper. Further, an ...
      Read Full Article
    3. 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.
      Read Full Article
    4. Advanced Optical Coherence Tomography techniques: novel and fast imaging tools for non-destructive testing

      Advanced Optical Coherence Tomography techniques: novel and fast imaging tools for non-destructive testing
      We demonstrate that Optical Coherence Tomography (OCT), a method which was originally developed for depth-resolved imaging of biological tissue, is suited to adequately respond to different problems posed in the field of contactless material characterisation and non-destructive testing and evaluation. In detail, the potential of advanced OCT techniques like ultrahigh-resolution OCT, polarisation-sensitive OCT or spectral-domain OCT is evaluated and exemplified for the imaging and characterisation of different polymer and ceramic materials, as well as of whole components, like polymer coated medical metal stents
      Read Full Article
    5. Ultrahigh-Resolution Transversal Polarization-Sensitive Optical Coherence Tomography: Structural Analysis and Strain-Mapping

      Abstract Optical coherence tomography (OCT), originally developed and so far nearly exclusively used for biomedical applications (e.g., [1,2]), is a contact-free, non-destructive technique based on low-coherence interferometry to image structures within translucent and turbid materials. Commonly, cross-sectional reflectivity images with a depth-resolution determined by the coherence length of the near-infrared light source are obtained. When OCT is performed in a polarization sensitive way (PS-OCT), additional information about birefringence within a material is obtained by mapping the retardation between ordinary and extraordinary rays [3]. Because birefringence is induced when strain occurs, PS-OCT provides depth resolved information about the internal ...
      Read Full Article
    6. Investigation of glass–fibre reinforced polymers by polarisation-sensitive, ultra-high resolution optical coherence tomography: Internal structures, defects and stress

      In this paper, we report on optical coherence tomography (OCT) for the investigation of glass–fibre reinforced polymer (GFRP) materials. OCT, a contactless and non-destructive imaging technique, provides depth-resolved information on internal structures within semi-transparent materials. In our study, we apply a highly advanced OCT technique: we use a transversal scanning, ultra-high resolution, polarisation-sensitive (UHR-PS)-OCT for the analysis of various GFRP samples. UHR-imaging with resolution in the micron range is shown to provide information on the scale of single fibres. PS-OCT, an extension of classical OCT, is sensitive to birefringence and consequently to anisotropies and stress within a material ...
      Read Full Article
    7. Non-destructive quantification of internal stress in polymer materials by polarisation sensitive optical coherence tomography

      Polarisation sensitive optical coherence tomography (PS-OCT) is an interferometric technique to determine and map the internal birefringence properties of translucent and turbid samples. Because of its non-destructive character, PS-OCT is an ideal method for material characterisation and testing. When birefringence patterns induced by mechanical strain are analysed, information about the stress within a material can be obtained. In this work, we investigate the stress in polymer samples using PS-OCT. From strain experiments under well defined loading conditions, we determine the stress optical coefficients for different materials by evaluation of the birefringence patterns. Applied to strained samples fabricated from these materials ...
      Read Full Article
    8. En-face scanning optical coherence tomography with ultra-high resolution for material investigation

      En-face scanning optical coherence tomography with ultra-high resolution for material investigation
      Optical coherence tomography (OCT) is an emerging technique for cross-sectional imaging, originally developed for biological structures. When OCT is employed for material investigation, high-resolution and short measurement times are required, and for many applications, only transversal (en-face) scans yield substantial information which cannot be obtained from cross-sectional images oriented perpendicularly to the sample surface alone. In this work, we combine transversal with ultra-high resolution OCT: a broadband femto-second laser is used as a light source in combination with acousto-optic modulators for heterodyne signal generation and detection. With our setup we are able to scan areas as large as 3 x ...
      Read Full Article
    1-8 of 8
  1. Categories

    1. Applications:

      Art, Cardiology, Dentistry, Dermatology, Developmental Biology, Gastroenterology, Gynecology, Microscopy, NDE/NDT, Neurology, Oncology, Ophthalmology, Other Non-Medical, Otolaryngology, Pulmonology, Urology
    2. Business News:

      Acquisition, Clinical Trials, Funding, Other Business News, Partnership, Patents
    3. Technology:

      Broadband Sources, Probes, Tunable Sources
    4. Miscellaneous:

      Jobs & Studentships, Student Theses, Textbooks
  2. Topics in the News

    1. (8 articles) Upper Austrian Research GmbH
    2. (6 articles) Medical University of Vienna
    3. (5 articles) Johannes Kepler University of Linz
    4. (1 articles) Superlum
    5. (1 articles) Jikei University School of Medicine
    6. (1 articles) Stanford University
    7. (1 articles) University of Pittsburgh
    8. (1 articles) Case Western Reserve University
    9. (1 articles) Pusan National University
    10. (1 articles) VU University Amsterdam
    11. (1 articles) University of Toronto
    12. (1 articles) Cleveland Clinic
  3. Popular Articles

  4. Picture Gallery

    En-face scanning optical coherence tomography with ultra-high resolution for material investigation Advanced Optical Coherence Tomography techniques: novel and fast imaging tools for non-destructive testing Advances in bronchoscopic optical coherence tomography and confocal laser endomicroscopy in pulmonary diseases Morphologic Stages of Rhegmatogenous Retinal Detachment Assessed with Swept-Source Optical Coherence Tomography En Face Images Using Ultra-Widefield Optical Coherence Tomography in 2 Cases of Traumatic Hypotony Maculopathy before and after Surgical Intervention Clinical Course of OCTA en face Imaging Findings in a Patient with HELLP Syndrome Values of optical coherence tomography angiography for diagnosing diabetic retinopathy and evaluating treatment outcomes Deep learning approaches to predict 10-2 visual field from wide-field swept-source optical coherence tomography en face images in glaucoma Quantification of Macular Perfusion Following Panretinal Photocoagulation for Diabetic Retinopathy: An Optical Coherence Tomography Angiography Study The effect of topical steroids and non-steroidal anti inflammatory drugs on epiphora of unknown cause: Optical Coherence Tomography Study A comprehensive update on the use of optical coherence tomography angiography in glaucoma Analysis of the optic nerve head microcirculation using OCT-A and the upstream macrocirculation using CDI in low- and high-tension glaucoma patients