1. Articles in category: NDE/NDT

    1-24 of 438 1 2 3 4 ... 17 18 19 »
    1. PhD position in the Applied Optics Group, University of Kent, Canterbury UK

      PhD position in the Applied Optics Group, University of Kent, Canterbury UK

      Project Summary Plant cuticle and underlying epidermis forms the outermost layer protecting plants from desiccation and from abiotic and biotic stresses. The cuticle comprises mainly of polyester cutin and epicuticular waxes that help to prevent moisture loss and maintenance of cell turgor. In fruits changes in surface properties play an important role in increasing consumer appeal during maturation through development of ‘blooms’ and colour changes. Importantly, the cuticle and epidermis form a mechanical barrier acting as the first-line in defence against the ingress from plant pathogens. The PhD Studentship will aim to develop optical coherence tomography (a non-invasive high-resolution microscopy ...

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    2. Effects of the chlorination and pressure flushing of drippers fed by reclaimed wastewater on biofouling

      Effects of the chlorination and pressure flushing of drippers fed by reclaimed wastewater on biofouling

      Milli-channel baffle labyrinths are widely used in drip irrigation systems. They induce a pressure drop enabling drip irrigation. However, with a section thickness that is measured in mm 2 , they are sensitive to clogging, which reduces the performance and service life of a drip irrigation system. The impact of chlorination (1.5 ppm of free chlorine during 1 h application) and pressure flushing (0.18 MPa) on the biofouling of non-pressure-compensating drippers, fed by real reclaimed wastewater, was studied at lab scale using optical coherence tomography. The effect of these treatments on microbial composition (bacteria and eukaryotes) was also investigated ...

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    3. Quantification of plant morphology and leaf thickness with optical coherence tomography

      Quantification of plant morphology and leaf thickness with optical coherence tomography

      Optical coherence tomography (OCT) can be a valuable imaging tool for in vivo and label-free digital plant phenotyping. However, for imaging leaves, air-filled cavities limit the penetration depth and reduce the image quality. Moreover, up to now quantification of leaf morphology with OCT has been done in one-dimensional or two-dimensional images only, and has often been limited to relative measurements. In this paper, we demonstrate a significant increase in OCT imaging depth and image quality by infiltrating the leaf air spaces with water. In the obtained high-quality OCT images the top and bottom surface of the leaf are digitally segmented ...

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    4. Deep convolutional neural networks: Outperforming established algorithms in the evaluation of industrial optical coherence tomography (OCT) images of pharmaceutical coatings

      Deep convolutional neural networks: Outperforming established algorithms in the evaluation of industrial optical coherence tomography (OCT) images of pharmaceutical coatings

      This paper presents a novel evaluation approach for optical coherence tomography (OCT) image analysis of pharmaceutical solid dosage forms based on deep convolutional neural networks (CNNs). As a proof of concept, CNNs were applied to image data from both, in- and at-line OCT implementations, monitoring film-coated tablets as well as single- and multi-layered pellets. CNN results were compared against results from established algorithms based on ellipse-fitting, as well as to human-annotated ground truth data. Performance benchmarks used include, efficiency (computation speed), sensitivity (number of detections from a defined test set) and accuracy (deviation from the reference method). The results were ...

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    5. Vision-Inspection-Synchronized Dual Optical Coherence Tomography for High-Resolution Real-Time Multidimensional Defect Tracking in Optical Thin Film Industry

      Vision-Inspection-Synchronized Dual Optical Coherence Tomography for High-Resolution Real-Time Multidimensional Defect Tracking in Optical Thin Film Industry

      Large-scale product inspection is an important aspect in thin film industry to identify defects with a high precision. Although vision line scan camera (VLSC)-based inspection has been frequently implemented, it is limited to surface inspections. Therefore, to overcome the conventional drawbacks, there is a need to extend inspection capabilities to internal structures. Considering that VLSC systems have access to rich information, such as color and texture, high-resolution real-time multimodal optical synchronization between VLSC and dual spectral domain optical coherence tomography (SD-OCT) systems was developed with a laboratory customized in-built automated defect-tracking algorithm for optical thin films (OTFs). Distinguishable differences ...

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    6. Research Center Pharmaceutical Engineering Awarded Two FDA Contracts for Next-Generation Pharma Technology

      Research Center Pharmaceutical Engineering Awarded Two FDA Contracts for Next-Generation Pharma Technology

      The Research Center Pharmaceutical Engineering GmbH (RCPE), a global leader in pharmaceutical engineering sciences, has been awarded FDA funding for two projects commencing in the 4th quarter of 2020. The projects will focus on utilising advanced technologies to improve production processes within Pharma. With an average of only 5 – 10 projects awarded to EU companies by the FDA each year, this development represents a landmark achievement for RCPE and reflects the potential impact of these projects within the global pharma industry. In partnership with major global pharma companies, including MSD and Pfizer, RCPE will use the FDA funding to investigate ...

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    7. Nondestructive evaluation of fused filament fabrication 3D printed structures using optical coherence tomography

      Nondestructive evaluation of fused filament fabrication 3D printed structures using optical coherence tomography

      Purpose The quality of components under fused filament fabrication (FFF) is related to the correct filament spacing and bonding of successively deposited layers and is evaluated mainly by scanning electron microscopy (SEM). However, it is a destructive technique and real-time evaluation is not possible. Optical coherence tomography (OCT), on the other hand, is an optical method that acquires cross-sectional images non-invasively and in real-time. Therefore, this paper aims to propose and validate the use of OCT as a non-destructive quality evaluation tool for FFF using Polylactic Acid (PLA) filaments. Design/methodology/approach PLA three-dimensional (3D) printed samples were made in ...

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    8. Insights into the Blanching of Water-Damaged Varnish by Means of Spectral-Domain Optical Coherence Tomography

      Insights into the Blanching of Water-Damaged Varnish by Means of Spectral-Domain Optical Coherence Tomography

      In consequence of the flooding of the Loing river in 2016, some of the storage areas for the Musée Girodet were submerged, with 3000 artworks affected. Following this, the painting Le Jeune Trioson (nineteenth century, attributed to the school of Anne-Louis Girodet De Roucy Trioson) developed severe blanching in the varnish, over the dark background in particular. An initial non-contact investigation with a spectral-domain optical coherence tomographic system operating in the near-infrared range (830–1020 nm) gave valuable insights into the development of this alteration. This detected a change in the scattering properties of the blanched varnish compared to ...

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    9. Spectroscopic Optical Coherence Tomography for Thin Layer and Foil Measurements

      Spectroscopic Optical Coherence Tomography for Thin Layer and Foil Measurements

      The main goal of this research was to assess if it is possible to evaluate the thickness of thin layers (both thin films on the surface and thin layers below the surface of the tested object) and foils using optical coherence tomography (OCT) for thickness assessment under the resolution of the standard commercially available OCT measurement system. In the proposed solution, light backscattered from the evaluated thin layer has been expressed as a multiple beam interference. Therefore, the OCT system was modeled as a two-beam interferometer (e.g., Michelson), in which one beam propagates from the reference arm and the ...

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    10. Introducing the Santec OPS-1000 3D Optical Profiler

      Introducing the Santec OPS-1000 3D Optical Profiler

      Santec introduces the new 3D Optical Profiler, OPS-1000. Designed to support R&D and production environments the OPS-1000 delivers fast, accurate and wide 3D object scans with high sensitivity, capturing surfaces other profilers may miss. A wide system dynamic range of >70dB enables non-contact, high-speed measurements with high accuracy, regardless of shape, material, color or surface condition. Intuitive control software allows the user to quickly configure scan profiles, automate testing, and export the point cloud data for analysis.

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      Mentions: Santec
    11. Monitoring fatigue damage in different CAD/CAM materials: A new approach with optical coherence tomography.

      Monitoring fatigue damage in different CAD/CAM materials: A new approach with optical coherence tomography.

      Purpose: To investigate fatigue damage over time, monolithic posterior computer-aided-designed/computer-aided-manufactured (CAD/CAM) crowns were artificially aged in a mouth-motion-simulator, and damage was monitored with optical coherence tomography (OCT). Methods: Forty-eight crowns were milled of six different CAD/CAM-materials (n=8), including 3Y-TZP (Lava Plus,‘3Y’), 4Y-PSZ (Pritidentamultidisc,‘4Y’), 5Y-PSZ (Prettauanterior,‘5Y’), zirconia-reinforced lithium silicate (CeltraDuo,‘ZLS’), hybrid ceramic (Vita Enamic,‘VE’),and resin composite (BrilliantCrios,‘COM’), and were adhesively luted on CAD/CAM-milled human molars. Specimens were artificially aged in a mouth-motion-simulator (50-500N, 2Hz, 37°C) for a period of 1 million cycles. Before loading and every 250,000 ...

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    12. Correlative infrared optical coherence tomography and hyperspectral chemical imaging

      Correlative infrared optical coherence tomography and hyperspectral chemical imaging

      Optical coherence tomography (OCT) is a high-resolution three-dimensional imaging technique that enables nondestructive measurements of surface and subsurface microstructures. Recent developments of OCT operating in the mid-infrared (MIR) range (around 4 µm) lifted fundamental scattering limitations and initiated applied material research in formerly inaccessible fields. The MIR spectral region, however, is also of great interest for spectroscopy and hyperspectral imaging, which allow highly selective and sensitive chemical studies of materials. In this contribution, we introduce an OCT system (dual-band, central wavelengths of 2 µm and 4 µm) combined with MIR spectroscopy that is implemented as a raster scanning chemical imaging ...

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    13. Surface and Internal Fingerprint Reconstruction from Optical Coherence Tomography through Convolutional Neural Network

      Surface and Internal Fingerprint Reconstruction from Optical Coherence Tomography through Convolutional Neural Network

      Optical coherence tomography (OCT), as a non-destructive and high-resolution fingerprint acquisition technology, is robust against poor skin conditions and resistant to spoof attacks. It measures fingertip information on and beneath skin as 3D volume data, containing the surface fingerprint, internal fingerprint and sweat glands. Various methods have been proposed to extract internal fingerprints, which ignore the inter-slice dependence and often require manually selected parameters. In this paper, a modified U-Net that combines residual learning, bidirectional convolutional long short-term memory and hybrid dilated convolution (denoted as BCL-U Net) for OCT volume data segmentation and two fingerprint reconstruction approaches are proposed. To ...

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    14. Full-Range Line-Field Optical Coherence Tomography for High-Accuracy Measurements of Optical Lens

      Full-Range Line-Field Optical Coherence Tomography for High-Accuracy Measurements of Optical Lens

      A full-range line-field Fourier-domain optical coherence tomography (LF-FDOCT) system with an accuracy at nanoscale was proposed for high-accuracy measurements of optical lens surface profile. The LF surface curve information of optical lens could be obtained in one measurement which does not need point-by-point scanning used in the traditional 1-D FDOCT system. The measurement accuracy of surface profile curve could be improved from micrometer scale to nanoscale by applying spectral center correction method (SCCM) to the complex spectral interferogram. The corrected five phase-shifting (CFPS) method was employed to eliminate the complex-conjugate artifacts and the polychromatic error. The numerical simulation and experiment ...

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    15. Three-dimensional color camera based on optical coherence tomography

      Three-dimensional color camera based on optical coherence tomography

      We propose a 3D color camera to record the moving objects image based on optical coherence tomography (OCT). A precise surface topography map of the object is acquired by OCT, to which, a color image acquired by a CCD, is fused. During OCT scanning, adjacent color images are cross-correlated to compute the offset position of the moving object. The offset position is applied to the OCT to tracking scan the moving object. A 3D topography algorithm is to reconstruct surface topography maps. The affine transform and similarity model are used to match the 2D color image to the surface topography ...

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    16. Physiological, Biochemical and Microstructural Changes in Rice (Oryza sativa L.) under Varying pH Levels

      Physiological, Biochemical and Microstructural Changes in Rice (Oryza sativa L.) under Varying pH Levels

      Soil acidification exerts detrimental effects on rice plant leading to severe reduction in its yield. In the present study, we investigated the physiological, biochemical and microstructural changes in the leaves of rice cultivars, namely, Jhilli Dhan (JD) and Gora Dhan (GD), under varying pH conditions (pH 6.5, 5.5, 4.5 and 3.5). Seedlings were grown at varying pH levels for 14 days under controlled conditions. Root and shoot growth and chlorophyll content were found to be decreased with increasing acidity, whereas electrolyte leakage was increased with increasing acidity. Overall, seedling growth was significantly reduced at pH 3 ...

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    17. Biospeckle optical coherence tomography in speedy visualizing effects of foliar application of plant growth hormone to Chinese chives leaves

      Biospeckle optical coherence tomography in speedy visualizing effects of foliar application of plant growth hormone to Chinese chives leaves

      Objective The aim of this study is to demonstrate the potential of applying the contrast of the speckles obtained as noise in optical coherence tomography (OCT) images to monitor short term activity changes during foliar application of phytohormones to a plant leaf. Plant growth hormone, gibberellic acid (GA 3 ) was sprayed onto the leaf of Chinese chives and after 60 min, OCT images (1 frame: 512 × 2048 pixels) were recorded at ten frames per second for a few tens of seconds. Results Contrast across the temporal axis was calculated for each pixel of the structural images and biospeckle OCT contrast ...

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    18. Optical coherence tomography for characterization of nanocomposite materials (Thesis)

      Optical coherence tomography for characterization of nanocomposite materials (Thesis)

      Nanocomposite materials play an increasingly important role in various application areas, be it in an industrial, medical or everyday environment. The unique properties of nanocomposites go beyond those of conventional composite materials. Because nanoparticles have a high surface-to-volume ratio such as carbon nanotubes, they can reinforce an embedding polymer host matrix mechanically, or they enhance the electrical material conductivity. A major challenge in the development of nanoparticles and nanocomposites is the control of particle size and shape, and of the uniform dispersion of nanoparticles in the host material. Conventional characterization techniques lack either resolution, or can only inspect details of ...

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    19. Optical coherence tomography measurement of capillary filling in porous silicon

      Optical coherence tomography measurement of capillary filling in porous silicon

      The use of nanoporous structures with known morphology allows studying the properties of fluids in conditions of strong spatial confinement. Alternatively, the capillary filling of nanoporous structures with simple fluids provides information on their morphology. When a liquid enters the porous structure there is an increase in the optical path of the porous layer, and measuring this optical path as a function of position and time allows evaluating the filling dynamics of the pores. In this work, we determined the capillary filling dynamics of nanostructured porous silicon (PS) by optical coherence tomography. The high spatial resolution of this technique allows ...

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    20. Absolute depth LIBS-stratigraphy with NoScSiSp-OCT

      Absolute depth LIBS-stratigraphy with NoScSiSp-OCT

      LIBS is a proven method for elemental analysis. It needs little to no sample preparation and relies solely on optical access to the sample. LIBS has therefore been handled as a promising analytical method for layered or structured samples with the potential to replace metallurgic cross-sections followed by SEM/EDX raster screenings. Due to the strong dependency of the ablation process on changing crater geometries, laser fluence, and plasma dynamics ( e.g. laser absorption and scattering by the plasma, material dependent optical depth, reflecting coefficients, scattering processes, etc. ), attributing an absolute depth to the number of laser pulses applied to ...

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    21. Effect of chlorination and pressure flushing of drippers fed by reclaimed wastewater on biofouling

      Effect of chlorination and pressure flushing of drippers fed by reclaimed wastewater on biofouling

      Dripper clogging reduces the performance and service life of a drip irrigation system. The impact of chlorination (1.5 ppm of free chlorine during 1 h application) and pressure flushing (0.18 MPa) on the biofouling of non-pressure-compensating drippers fed by real reclaimed wastewater was studied at lab scale using Optical Coherence Tomography. The effect of these treatments on microbial composition (bacteria and eukaryotes) was also investigated by High-throughput DNA sequencing. Biofouling was mainly observed in inlet, outlet and return areas of the drippers. Chlorination limited biofilm development mainly in the mainstream of the milli-labyrinth channel. It was more efficient ...

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    22. Laser Lens Size Measurement Using Swept-Source Optical Coherence Tomography

      Laser Lens Size Measurement Using Swept-Source Optical Coherence Tomography

      A high-speed, high-resolution swept-source optical coherence tomography (SS-OCT) is presented for focusing lens imaging and a k-domain uniform algorithm is adopted to find the wave number phase equalization. The radius of curvature of the laser focusing lens was obtained using a curve-fitting algorithm. The experimental results demonstrate that the measuring accuracy of the proposed SS-OCT system is higher than the laser confocal microscope.

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    23. Ultrafast-laser ablation of polymer multicore fibers enhances biomedical sensing

      Ultrafast-laser ablation of polymer multicore fibers enhances biomedical sensing

      The next step is to integrate the multipoint-emission fiber, with optimization, in devices to perform a range of biomedical applications such as fluorescence, 2 confocal imaging, 3 photobiomodulation, 4 optical tomography, 5 medical device location, 6 and 3D optical coherence tomography (OCT). 7 The discrete emission of light has potential in medical diagnostics, enabling spectroscopic investigation at many points along a medical device throughout an organ or extended tissue structures. During medical-device placement—for instance, central venous catheter placement—multipoint light emission along the device length could be viewed through the skin. An immediate application of such a fiber is ...

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    24. A Method for the Assessment of Textile Pilling Tendency Using Optical Coherence Tomography

      A Method for the Assessment of Textile Pilling Tendency Using Optical Coherence Tomography

      Pilling is caused by friction pulling and fuzzing the fibers of a material. Pilling is normally evaluated by visually counting the pills on a flat fabric surface. Here, we propose an objective method of pilling assessment, based on the textural characteristics of the fabric shown in optical coherence tomography (OCT) images. The pilling layer is first identified above the fabric surface. The percentage of protruding fiber pixels and Haralick’s textural features are then used as pilling descriptors. Principal component analysis (PCA) is employed to select strongly correlated features and then reduce the feature space dimensionality. The first principal component ...

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