Popular Articles
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OCT Companies in the News
(2 articles) Michelson Diagnostics
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Organizations in the News
(14 articles) Upper Austrian Research GmbH
(10 articles) Medical University of Vienna
(5 articles) University of Oulu
(2 articles) Moscow State University
(2 articles) UK National Physical Laboratory
(2 articles) University of Kent
(1 articles) Laser Zentrum Hannover
(1 articles) Queen's University
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Speckle noise reduction in optical coherence tomography of paint layers
Explore Article opticsinfobase.org (Dec 21 2009) Art , NDE/NDT , Other Non-Medical
We present and characterize a sequential angular compounding method for reducing speckle contrast in optical coherence tomography images of paint layers. The results are compared with postprocessing methods, and we show that the compounding technique can improve the speckle contrast ratio in B-scans by better than a factor of 2 in exchange for a negligible loss of resolution. As a result, image aesthetics are improved, thin layers become more distinct, and edge-detection algorithms work more efficiently. The effect of varying the angular scan size and number of averages is investigated, and it is found that a degree of statistical correlation ...Comment on Article Mentions: Adrian G. Podoleanu University of Kent
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Structural and optical properties of wood and wood finishes studied using optical coherence tomography: application to an 18th century Italian violin
Explore Article opticsinfobase.org (Nov 13 2009) Art , NDE/NDT
Optical coherence tomography (OCT) is especially attractive for the study of cultural heritage artifacts because it is noninvasive and nondestructive. We have developed an original full-field time-domain OCT system dedicated to the investigation of varnished and painted artifacts: an interferometric Mirau objective allows one to perform the scan without moving the works of art. The axial and transverse high resolution (respectively, 1.5 and 1 μm) are well adapted to the detection of the investigated structures (pigment grains, wood fibers, etc.). The illumination spectrum is in the visible range (centered at 630 nm, 150 nm wide) to potentially allow us to ...
Comment on Article Mentions: Jean-Philippe Echard Isabelle Emond Mady Elias
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OCT aims for industrial application
Explore Article Laser Focus World (Sep 1 2009) NDE/NDT
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 in a recent article published by Ocular Surgery News. Writes author Richard Lindstrom, “Every day in clinical practice around the world, optical coherence tomography is making a significant contribution to ...
Comment on Article Mentions: Michelson Diagnostics Thorlabs Richard L. Lindstrom
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Laser Processing Apparatus For Monitoring Processing State By Using Optical Coherence Tomography Technology (Wo 2009/096750)
Explore Article wipo.int (Aug 6 2009) NDE/NDT , Other Non-Medical , Patents
Disclosed is a laser processing apparatus for monitoring a processing state by using optical coherence tomography technology. The disclosed laser processing apparatus comprises: a processing unit that disrupts the molecular binding of a workpiece by using a femtosecond laser beam; a tomographic monitoring unit that monitors a three-dimensional state of the workpiece; and a controller that controls the output of femtosecond laser beam by using a three-dimensional tomographic image. The laser processing apparatus may further include a surface monitoring unit which monitors a surface state of the workpiece. The laser processing apparatus enables active control over its whole processes since ...
Comment on Article Mentions: Gwangju Institute of Science and Technology
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Multilayered structures examination using polarization sensitive optical coherence tomography
Explore Article Photonics Society of Poland (Jul 18 2009) NDE/NDT
Optical Coherence Tomography (OCT) is an optical method for non-contact and non-destructive examination of inner structure of multi-layered structures. Polarization sensitive OCT (PS-OCT) is also capable of measuring local optical anisotropy changes. The measurement results, obtained using our custom-built PS-OCT setup, for multilayered birefringent structures demonstrate the applicability of the PS-OCT to characterization of multilayered material stacks containing birefringent polymer layers used e.g. in display technology. In this Letter we present some aspects of our research and experiments and discuss usefulness of polarization sensitive analysis in OCT for examination of technical materials. -
Non-destructive detection of defects in artificial skin tissue by optical coherence tomography
Explore Article SPIE Digital Library (Jul 13 2009) Dermatology , NDE/NDT
The application of optical coherence tomography OCT in tissue engineering facilities offers great potential for the automated detection of defects or inhomogeneities in tissue products. This non-invasive and non-destructive measurement technique enables the high speed generation of two dimensional cross sections of tissue with micron resolution. The integration of an OCT device into a tissue production facility allows the monitoring and quality control of tissue engineering products. By the selective exclusion of tissue products with insufficient quality features a high degree in production standard is guaranteed. In a first study, OCT tomograms of artificial skin equivalents were acquired and compared ... -
An investigation of the accelerated thermal degradation of different epoxy resin composites using x-ray micro computed tomography and optical coherence tomography
Explore Article ScienceDirect (Jun 27 2009) NDE/NDT
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 samples. ...Comment on Article Mentions: Upper Austrian Research GmbH David Stifter Karin Wiesauer
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Roughness measurement methodology according to DIN 4768 using optical coherence tomography (oct)
Explore Article SPIE Digital Library (Jun 15 2009) NDE/NDT
Measure roughness in some sort of samples can present several problems when it is done in traditional way (with physical contact). For instance, soft samples will present at least two kinds of problem: (a) the value presented by the equipment not represents the sample roughness; (b) the equipment ca ... [Proc. SPIE 7390, 73900Z (2009)] published Mon Jun 15, 2009.Comment on Article Mentions: Thorlabs
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Masmicro micro-/nano-materials processing, analysis, inspection and materials knowledge management
Explore Article SpringerLink Home (Jun 4 2009) NDE/NDT
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 application example of artificial neural ...Comment on Article Mentions: Upper Austrian Research GmbH David Stifter Karin Wiesauer
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Automated contact lens measurement using optical coherence tomography
Explore Article SPIE Digital Library (Feb 23 2009) NDE/NDT
Optical Coherence Tomography (OCT) is a non-destructive imaging modality that has proven to be a useful tool for making quantitative measurements in a variety of applications. One area where non-destructive quantitative measurement is important is contact lens metrology, specifically prism. Prism is defined as the difference between the largest and smallest thickness measured at a fixed distance from the contact lens edge. We developed and tested an algorithm that automatically analyzes OCT images to accurately measure contact lens thickness. Images were obtained with the Thorlabs OCT930SR spectral radar OCT system. An automated rotation stage was used to precisely rotate the ...Comment on Article Mentions: Thorlabs Jennifer K. Barton University of Arizona
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University's medical hi-tech technology used on rare artifact
Explore Article thisisnottingham (Feb 10 2009) Art , NDE/NDT , Other Non-Medical
A HI-TECH medical imaging technique is being used to help unlock the secrets of a priceless 1,000 year old artefact. The Fadden More Psalter – an eighth century book of Psalms – is the latest archaeological find to be examined by scientists from Nottingham Trent University using Optical Coherence Tomography (OCT) which was originally developed as for medical imaging. The technology has been put to work by the university team to develop a new field of imaging for art conservation and archaeology. OCT can see a 3D image of the layers below the surface of a painting or decorated surface, ...Comment on Article Mentions: Haida Liang Nottingham Trent University
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Simultaneous tomography and topography of silicon integrated circuits using full-fieldswept-source optical coherence tomography
Explore Article Institute of Physics (Jan 7 2009) NDE/NDT
Abstract. We demonstrate simultaneous tomography and topography of micro-electro-mechanical systems based on silicon integrated circuits using full-field swept-source optical coherence tomography. The optical set-up consists of a swept-source system, a compact Michelson interferometer, and an area detector. The swept-source system comprises a superluminescent diode as a broadband light source in conjunction with an acousto-optic tunable filter as a fast frequency tuning device. By means of sweeping the frequency of the light source, multiple interferograms were recorded and both the amplitude and the phase map of the interference fringe signal were reconstructed. Optically sectioned images of the silicon integrated circuits were ...Comment on Article Mentions: Chandra Shakher Indian Institute of Technology at Delhi Dalip Singh Mehta
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Optical Coherence Tomography in archaeological and conservation science - a new emerging field
Explore Article SPIE Digital Library (Dec 30 2008) Art , NDE/NDT
There has been a long tradition of applying biomedical imaging techniques to the examination of historical artefacts, owing to similar demands for non-invasive methods in both fields. Optical Coherence Tomography (OCT) is no exception. We review the achievements on OCT applications to art conservati ... [Proc. SPIE 7139, 713915 (2008)] published Tue Dec 30, 2008.Comment on Article Mentions: Adrian G. Podoleanu Haida Liang University of Kent
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Emerging Techniques in Polymer Microscopy (Book Chapter)
Explore Article SpringerLink Home (Dec 24 2008) NDE/NDT , Textbooks
In the previous edition of this book, this chapter was called “New Techniques in Polymer Microscopy.” Now, nearly 10 years later, many of these once new techniques, like atomic force microscopy (AFM), have become standard for many polymer microscopists. Others, such as confocal scanning microscopy, or scanning near-field optical microscopy, ha...
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Spatially Resolved Stress Measurements in Materials with Polarisation-Sensitive Optical Coherence Tomography: Image Acquisition and Processing Aspects
Explore Article www3.interscience.wiley.com (Dec 21 2008) NDE/NDT
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.Comment on Article Mentions: Christoph K. Hitzenberger Michael Pircher Medical University of Vienna
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