1. David Stifter

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    1. Mentioned In 44 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. Polarisation-sensitive optical coherence tomography for material

      Polarisation-sensitive optical coherence tomography for material
      Optical Coherence Tomography (OCT) is an emerging technology for high-resolution non-contact imaging of semi-transparent structures. Originally developed for medical diagnostics, we extend the OCT-technique to problems posed in material testing and characterisation. Layer thickness and refractive indices as well as internal structures of polymer parts have been determined within this study. An extension of OCT, namely polarisation-sensitive OCT (PS-OCT) has been used to identify regions of increased anisotropy within injection-moulded ...
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    4. 10th International Conference on Advances in Experimental Mechanics

      10th International Conference on Advances in Experimental Mechanics
      The 10th International Conference on Advances in Experimental Mechanics will be held September 1-3, 2015 at Heriot-Watt University in Edinburgh, United Kingtom. The conference focuses on research which advances experimental techniques across the very widest range of applications in mechanics, including stress, strain and vibration analysis. In this context, investigations and studies performed by low coherence techniques, as e.g. PS-OCT, Doppler OCT or Optical Coherence Elastography, are welcomed. Key ...
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      Mentions: David Stifter
    5. 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
      Researchers of CDL MS-MACH, Johannes Kepler University Linz, Austria, have recently demonstrated time domain polarization-sensitive full-field optical coherence microscopy (PS-FF-OCM) and low coherence interferometric second harmonic generation microscopy (iSHGM-OCM), as two current modifications of FF-OCM and scanning OCM, for extending the application range of FF-OCM and SHG microscopy adapted for use in material sciences [1]. The first technique, PS-FF-OCM, can simultaneously deliver reflectivity, retardation and (in-plane) optical axis information of ...
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    6. 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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    7. Low coherence interferometric second harmonic generation microscopy for non-destructive material testing using a broadband 1550 nm fs-fiber laser

      Low coherence interferometric second harmonic generation microscopy for non-destructive material testing using a broadband 1550 nm fs-fiber laser
      In this paper low coherence interferometric second harmonic generation (SHG) imaging is successfully demonstrated using a compact broadband fs-fiber laser operating around 1550 nm. In combination with linear optical coherence microscopy, this SHG technique is tailored for structural and functional investigations of surfaces and subsurface regions of non-biological samples, like corrosion sites formed on metals below organic coatings.
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    8. 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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    9. 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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    10. Special session dedictated to OCT at the 16th International Conference on Experimental Mechanics - ICEM16, July 2014, Cambridge/UK

      Special session dedictated to OCT at the 16th International Conference on Experimental Mechanics - ICEM16, July 2014, Cambridge/UK
      Special session dedictated to OCT at the 16th International Conference on Experimental Mechanics - ICEM16, 7th to 11th July 2014, Cambridge/UK. The conference brings together internationally leading researchers across a wide range of disciplines in both academia and industry to interchange ideas and discuss new research in the area of experimental mechanics. A special session is dedicated to the application of OCT, which provides access in a non-invasive/non-destructive way ...
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      Mentions: David Stifter
    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. 1-15 of 44 1 2 3 »
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  2. About David Stifter

    David Stifter

    David Stifter is Assoc.-Prof. at the Center for Surface and Nanoanalytics (ZONA) and head of the Christian Doppler Laboratory for Microscopic and Spectroscopic Material Characterization (CDL-MS-MACH); Johannes Kepler University Linz, Austria.

  3. Quotes

    1. Benefits from older concepts, which need re-evaluation with respect to the performance and availability of novel photonics components and devices can be expected.
      In OCT aims for industrial application