Other Non-Medical -Optical Coherence Tomography News

Articles in category: Other Non-Medical

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1. Optical coherence tomography for vulnerability assessment of sandstone
  
  Explore opticsinfobase.org May 7 2013 NDE/NDT , Other Non-Medical
  
  Sandstone is an important cultural heritage material, in both architectural and natural settings, such as neolithic rock art panels. The majority of deterioration effects in porous materials such as sandstone are influenced by the presence and movement of water through the material. The presence of water within the porous network of a material results in changes in the optical coherence tomography signal intensity that can be used to monitor the wetting front of water penetration of dry porous materials at various depths. The technique is able to detect wetting front velocities from 1 cm s − 1 to 10 − 6 cm ...
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  Mentions: Nottingham Trent University Haida Liang
2. Application of optical coherence tomography to non-destructively characterise rind breakdown disorder of ‘Nules Clementine’ mandarins
  
  Explore ScienceDirect May 4 2013 Other Non-Medical
  
  The feasibility of optical coherence tomography (OCT) for imaging histological changes associated with the development of a progressive rind breakdown (RBD) disorder of ‘Nules Clementine’ mandarin ( Citrus reticulate Blanco.) was investigated. The investigation utilised fruit with different levels of the disorder, carefully selected from a batch of fruit stored for eight weeks at 8 ± 0.5 °C. Images of healthy and RBD-affected intact mandarin fruit were acquired using a Thorlabs OCT system based on a broadband 930 nm source. OCT provided high resolution 2D images of fruit rind to a depth of about 1.1 mm. Immediate and non-destructive acquisition ...
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  Mentions: Thorlabs Cranfield University Ralph P. Tatam
3. Feasibility of correlation mapping optical coherence tomography (cmOCT) for anti-spoof sub-surface fingerprinting
  
  Explore Wiley Online Library Apr 28 2013 Dermatology , Other Non-Medical
  
  We propose the use of correlation mapping optical coherence tomography (cmOCT) to deliver additional biometrics associated with the finger that could complement existing fingerprint technology for law enforcement applications. The current study extends the existing fingerprint paradigm by measuring additional biometrics associated with sub-surface finger tissue such as sub-surface fingerprints, sweat glands, and the pattern of the capillary bed to yield a user-friendly cost effective and anti-spoof multi-mode biometric solution associated with the finger. To our knowledge no other method has been able to capture sub-surface fingerprint, papillary pattern and horizontal vessel pattern in a single scan or to show ...
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  Mentions: Kirill V. Larin University of Houston Hrebesh M. Subhash
4. Optical Coherence Tomography Enabling Non Destructive Metrology of Layered Polymeric GRIN Material
  
  Explore Nature Publishing Group Apr 24 2013 NDE/NDT , Other Non-Medical
  
  Gradient Refractive INdex (GRIN) optical components have historically fallen short of theoretical expectations. A recent breakthrough is the manufacturing of nanolayered spherical GRIN (S-GRIN) polymer optical elements, where the construction method yields refractive index gradients that exceed 0.08. Here we report on the application of optical coherence tomography (OCT), including micron-class axial and lateral resolution advances, as effective, innovative methods for performing nondestructive diagnostic metrology on S-GRIN. We show that OCT can be used to visualize and quantify characteristics of the material throughout the manufacturing process. Specifically, internal film structure may be revealed and data are processed to extract ...
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  Mentions: University of Rochester Kye-Sung Lee Panomsak Meemon
5. Measurement Technique Offers a Way of Improving Optical Lens Making
  
  Explore University of Rochester Apr 23 2013 NDE/NDT , Other Non-Medical
  
  Researchers at the University of Rochester have applied a sophisticated imaging technique to obtain the first 3D, high-resolution pictures of a recently developed type of optical lenses. They say that using Optical Coherence Tomography (OCT) during the manufacturing process allows them to significantly improve the quality of these new and promising lenses.
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  Mentions: University of Rochester Kye-Sung Lee Panomsak Meemon
6. A 3D edge detection technique for surface extraction in computed tomography for dimensional metrology applications
  
  Explore ScienceDirect Apr 20 2013 NDE/NDT , Other Non-Medical
  
  Many factors influence the measurement uncertainty when using computed tomography for dimensional metrology applications. One of the most critical steps is the surface extraction phase. An incorrect determination of the surface may significantly increase the measurement uncertainty. This paper presents an edge detection method for the surface extraction based on a 3D Canny algorithm with sub-voxel resolution. The advantages of this method are shown in comparison with the most commonly used technique nowadays, i.e. the local threshold definition. Both methods are applied to reference standards and industrial parts and the comparison of the uncertainties obtained by both methods is ...
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  Mentions: Technical University of Denmark (DTU) Shahab Chitchian Santiago Jiménez-Valero
7. Machining device and method for machining material
  
  Explore uspto.gov Apr 2 2013 Other Non-Medical , Patents
  
  The invention relates to a machining device (10) comprising at least one machining head (16) designed to provide at least one high-energy machining beam (22), especially an electron or laser beam. Such a machining device is used to remove material from workpieces (28) or for connecting workpieces (28) by bonding, especially by means of welding. According to the invention, at least one scanning device (32) designed as an optical coherence tomograph and provided for surface scanning is associated with the machining head (16). The invention also relates to a method for machining material using a high-energy machining beam for scanning ...
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8. Defense of fake fingerprint attacks using a swept source laser optical coherence tomography setup
  
  Explore Conference Proceedings Mar 18 2013 Dermatology , Other Non-Medical
  
  The most established technique for the identification at biometric access control systems is the human fingerprint. While every human fingerprint is unique, fingerprints can be faked very easily by using thin layer fakes. Because commercial fingerprint scanners use only a two-dimensional image acquisition of the finger surface, they can only hardly differentiate between real fingerprints and fingerprint fakes applied on thin layer materials. A Swept Source OCT system with an A-line rate of 20 kHz and a lateral and axial resolution of approximately 13 μm, a centre wavelength of 1320 nm and a band width of 120 nm (FWHM) was ...
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  Mentions: Sven Meissner Dresden University of Technology Edmund Koch
9. Feature Of The Week 3/10/13: Optical Coherence Tomography for Apple Surface Structure Evaluation
  
  Explore Optical Coherence Tomography News Mar 10 2013 NDE/NDT , Other Non-Medical
  
  Worldwide a lot of effort is invested in delivering fruit of the highest quality to the consumer. This means that the fruit should look good, taste good and preserve these properties for a sufficiently long period of time after harvest in order for the fruit to be of commercial value. Of course many aspects need to be considered, but here we will focus on the function of the peel. The first thing that meets the eye of the consumer is the peel of the fruit, and in many cases this is the only quality criterion that the consumer uses to ...
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  Mentions: K. U. Leuven Michael Leitner RECENDT
10. Non-Invasive Method and Apparatus for Screening High-Quality Seeds
  
  Explore patentscope.wipo.int Mar 8 2013 Other Non-Medical , Patents
  
  Disclosed is a method and apparatus for the non-invasive selection of high-quality seeds, based on optical coherence tomography, by which pathogen-infected and pathogen-free seeds can be discriminated in a non-invasive manner. The apparatus is operated by the processes of scanning a seed of diagnostic interest in a non-invasive manner using an optical coherence tomographic unit; processing interference signals of the scanned tomographic images to produce tomographic image data of the seed of diagnostic interest; analyzing the tomographic image data; comparing the analyzed tomographic image data with preset reference tomographic image data; diagnosing the seed of diagnostic interest as a pathogen-infected ...
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  Mentions: Santec Jeehyun Kim Changho Lee
11. Method And Device For Early Non-Invasive Diagnose Of Fruit Tree Disease
  
  Explore patentscope.wipo.int Mar 1 2013 Other Non-Medical , Patents
  
  The present invention relates to a non-invasive early diagnostic method and device that allows an early diagnosis of Marssonina blotch disease, which infects apple tree leaves, before the occurrence of lesions to enable early prevention of apple Marssonina blotch disease. The method and device of the present invention comprise the following steps: irradiating a broadband light source on an apple tree leaf undergoing diagnosis by means of optical coherence tomography; detecting interference signals from light reflected from the apple tree leaf undergoing diagnosis and light reflected from a reference arm; signal processing the interference signals, which have been detected through ...
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  Mentions: Santec Jeehyun Kim Changho Lee
12. Feature Of The Week 2/17/13: Using Optical Coherence Tomography to Investigate Fruiting Bodies formed by Gliding Bacteria
  
  Explore Optical Coherence Tomography News Feb 17 2013 Other Non-Medical
  
  The formation of spore-filled fruiting bodies by myxobacteria is a fascinating case of multicellular self-organization by bacteria. The organization of Myxococcus xanthus into fruiting bodies has long been studied not only as an important example of collective motion of bacteria, but also as a simplified model for developmental morphogenesis. Sporulation within the nascent fruiting body requires signaling between moving cells in order that the rod-shaped self-propelled cells differentiate into spores at the appropriate time. Probing the three-dimensional structure of myxobacteria fruiting bodies has previously presented a challenge due to limitations of different imaging methods. A new technique using Infrared Optical ...
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  Mentions: Cameron W. Harvey
13. Optical coherence tomography visualizes microstructure of apple peel
  
  Explore ScienceDirect Jan 29 2013 Other Non-Medical
  
  Optical coherence tomography (OCT) has emerged recently as a non-destructive technique to visualize subsurface structures of materials. The objective of this work was to investigate whether OCT is an appropriate method to non-destructively assess the peel structural properties of apple fruit and to compare OCT to confocal microscopy and micro-CT. Peel structural properties of apples from different cultivars (‘Braeburn’, ‘Arlet’, ‘Royal Gala’ and ‘Ida Red’) were measured. The effects of preharvest fertilization treatments and storage duration on calculated structural properties of apple peel from OCT images were investigated. It was found that OCT is a fast, high resolution and high ...
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  Mentions: K. U. Leuven Michael Leitner RECENDT
14. St. Jude launches $1B stock buyback after stock plunge
  
  Explore fiercemedicaldevices.com Nov 30 2012 Cardiology , Other Non-Medical
  
  St. Jude Medical ( $STJ ) has authorized a $1 billion stock repurchase effort amid rumors that it's under the regulatory gun, a week after the company's shares took a dive over new concerns about the safety of its devices. The buyback "demonstrates the confidence our board and management team have in the long-term prospects for St. Jude Medical," CEO Dan Starks said in a statement. The company says it has about 308 million shares outstanding at the moment. After last year's recall of Riata ICD leads pilloried the companies profits, St. Jude faces fresh worry over Durata , the ...
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  Mentions: FDA Daniel J. Starks St. Jude Medical
15. OCT for industrial applications
  
  Explore Conference Proceedings Nov 24 2012 NDE/NDT , Other Non-Medical
  
  Optical coherence tomography (OCT), as an interferometric method, has been studied as a distance ranger. As a technology capable of producing high-resolution, depth-resolved images of biological tissue, OCT had been widely used for the application of ophthalmology and has been commercialized in the market today. Enlightened by the emerging research interest in biomedical domain, the applications of OCT in industrial inspection were rejuvenated by a few groups to explore its potential for characterizing new materials, imaging or inspecting industrial parts as a service solution[3]. Benefiting from novel photonics components and devices, the industrial application of the older concepts in ...
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  Mentions: Michelson Diagnostics Thorlabs
16. Dual-channel low-coherence interferometry and its application to quantitative phase imaging of fingerprints
  
  Explore opticsinfobase.org Nov 21 2012 Dermatology , Other Non-Medical
  
  We introduce an off-axis, wide-field, low-coherence and dual-channel interferometric imaging system, which is based on a simple-to-align, common-path interferometer. The system requires no optical-path-difference matching between the interferometric arms in order to obtain interference with low-coherence light source, and is capable of achieving two channels of off-axis interference with high spatial frequency. The two 180°-phase-shifted interferograms are acquired simultaneously using a single digital camera, and processed into a single, noise-reduced and DC-suppressed interferogram. We demonstrate using the proposed system for phase imaging of fingerprint templates. Due to the fact that conventional phase unwrapping algorithms cannot handle the complex and ...
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17. Application of optical coherence tomography to detect Cucumber green mottle mosaic virus (CGMMV) infected cucumber seed
  
  Explore SpringerLink Home Nov 8 2012 NDE/NDT , Other Non-Medical
  
  Abstract In this study, we distinguished Cucumber green mottle mosaic virus (CGMMV) infected seeds from healthy seeds using optical coherence tomography (OCT). Two dimensional OCT images and stereo micrographs revealed that the infected seeds had narrow gap between the seed coat and endosperm that were not present in the healthy seeds. Three dimensional OCT images confirmed that the narrow gaps were present in the inner structure of overall the infected seeds. A-scan analysis was also performed to calculate the distance from the seed coat to the endosperm. The results revealed a difference in the width of the gap of about ...
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  Mentions: Santec Jeehyun Kim Changho Lee
18. Measurement of moisture content in photovoltaic panel encapsulants using spectroscopic optical coherence tomography: a feasibility study
  
  Explore Conference Proceedings Oct 19 2012 Other Non-Medical
  
  EVA, a copolymer of ethylene and vinyl acetate, is a common encapsulant material used in silicon-based PV modules. It contributes to the structural integrity of the modules, provides electrical insulation and also acts as an environmental barrier. However, water can diffuse through EVA into the modules, leading to swelling and chemical degradation, which can impact interfacial bonds, leading to delamination and allowing more ingress to occur that can eventually end up in accelerated corrosion and device failure. Fourier Transform infrared spectroscopy (FTIR) and gravimetric techniques have been used to quantify water concentration and the diffusion coefficient in free standing EVA ...
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19. Shear-banding in polyacrylamide solutions revealed via optical coherence tomography velocimetry
  
  Explore RSC Publishing Home Oct 2 2012 NDE/NDT , Other Non-Medical , Doppler
  
  We used optical coherence tomography velocimetry inside a fluids rheometer to study the rheology of a family of polyacrylamide (PAM) solutions that contain different polymer molecular weights and concentrations, with picolitre probing volumes. The linear velocity profiles obtained from low molecular weight samples, characteristic of Newtonian fluids under shear, become shear-banded when longer polymer chains (molecular weights 5000000 and above) are used at sufficiently high concentrations. Upon increasing the concentration further, shear-banding becomes less dominant and significant wall-slip takes place on the two plates of the rheometer. We describe the shear-banding and wall-slip phenomena in our samples in terms of ...
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  Mentions: University of Manchester
20. Characterization of ink-jet printed RGB color filters with spectral domain optical coherence tomography
  
  Explore Conference Proceedings Sep 18 2012 Other Non-Medical
  
  We present the use of sub-micron resolution optical coherence tomography (SMR SD-OCT) in volumetric characterization of ink- jet printed color filters, aimed for electronic paper display (EPD). The device used in the study is based on supercontinuum light source, Michelson interferometer centered at 600 nm and employs 400-800 nm spectral region. Spectra are acquired at a continuous rate of 140,000 per second. Color filter array of 143 μm x 141 μm sized and 6 rtm deep ink pools was studied. The volumetric OCT reconstruction was done using the experimental SMR SD-OCT device and a commercial SD-OCT imaging ...
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  Mentions: Janne Lauri Tapio E. J. Fabritius Risto A. Myllylä
21. Wafer Alignment System With Optical Coherence Tomography
  
  Explore patentscope.wipo.int Sep 13 2012 Other Non-Medical , Patents
  
  A system for performing alignment of two wafers is disclosed. The system comprises an optical coherence tomography system and a wafer alignment system. The wafer alignment system is configured and disposed to control the relative position of a first wafer and a second wafer. The optical coherence tomography system is configured and disposed to compute coordinate data for a plurality of alignment marks on the first wafer and second wafer, and send that coordinate data to the wafer alignment system.
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22. Feature Of The Week 8/5/12: Dresden University of Technology Uses OCT As a Tool for Microscope Investigation of Nucleated Boiling on Headed Surfaces
  
  Explore Optical Coherence Tomography News Aug 4 2012 Other Non-Medical
  
  Dresden University of Technology has been very active publishing interesting articles across a wide range of technologies and applications for Optical Coherence Tomography (see Link). Recently researchers their showed an interesting non-biological non-medical applications for OCT, namely the application of OCT ininvestigating boiling phenomena. Below is a summary of their work. -Eric Swanson Boiling phenomena are an important aspect in security and efficiency for technical applications with high heat flux like nuclear reactors. This study presents optical coherence tomography (OCT) as a novel modality for three-dimensional and two-dimensional time resolved imaging of nucleate boiling on heated surfaces on a microscopic ...
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  Mentions: Sven Meissner Dresden University of Technology Edmund Koch
23. Mobile Optical Coherence Tomography Sensor for Surface Layers Testing
  
  Explore Scientific.Net Jul 18 2012 NDE/NDT , Other Non-Medical
  
  In the paper the new type of mobile sensor based on optical coherence tomography is presented. For increasing the measurement range the special dynamic focusing system which moves imaging plane during axial scanning process is used. Therefore developed system allows focusing on measured layer. Additionally, for image analysis the special type of CMOS matrix (called smart-pixel camera), synchronized with a reference mirror transducer, is applied. Due to hardware realization of a fringe contrast analysis simultaneously in each pixel with high frequency, the time of measurement decreases significantly. These advantages together with a compact design allow the sensor to be used ...
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24. Assessment of optical coherence tomography for metrology applications in high-scattering ceramic materials (Thesis)
  
  Explore kth.diva-portal.org Jul 5 2012 Other Non-Medical , Student Theses
  
  Large-scale and cost-effective manufacturing of ceramic micro devices based on tape stacking requires the development of inspection systems to perform high-resolution in-process quality control of embedded manufactured cavities, metal structures and defects. In this work, alumina ceramic samples are evaluated by optical coherence tomography (OCT) operating at 1.3μm wavelength and some dimensional data are obtained by dedicated image processing and segmentation. Layer thicknesses can be measured and laser-machined channels can be verified embedded at around 100μm depth. Moreover, detection of internal defects is enabled. Monte Carlo ray tracing simulations are employed to analyze the abilities of OCT ...
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