1. Articles in category: NDE/NDT

    1-24 of 528 1 2 3 4 ... 20 21 22 »
    1. In situ volumetric imaging and analysis of FRESH 3D bioprinted constructs using optical coherence tomography

      In situ volumetric imaging and analysis of FRESH 3D bioprinted constructs using optical coherence tomography

      As 3D bioprinting has grown as a fabrication technology, so too has the need for improved analytical methods to characterize engineered constructs. This is especially challenging for engineered tissues composed of hydrogels and cells, as these materials readily deform when trying to assess print fidelity and other properties non-destructively. Establishing that the 3D architecture of the bioprinted construct matches its intended anatomic design is critical given the importance of structure-function relationships in most tissue types. Here we report development of a multimaterial bioprinting platform with integrated optical coherence tomography (OCT) for in situ volumetric imaging, error detection, and 3D reconstruction ...

      Read Full Article
    2. Optical coherence tomography—in situ and high-speed 3D imaging for laser materials processing

      Optical coherence tomography—in situ and high-speed 3D imaging for laser materials processing

      Exploiting Fourier-domain optical coherence tomography, a high-speed and real-time inspection of multi-photon 3D laser printing has been reported. We expect that this technique can be further extended to single shot compressive 3D imaging for studying the ultrafast dynamics of laser-matter interaction. Femtosecond lasers are essential tools for micro/nanoscale surface patterning 1 , as well as 3D lithography and printing 2 , 3 . Aiming for highly precision laser engineering, in situ and high-speed monitoring is of significance. While the wide-field microscopy enables a convenient in situ monitoring, it is limited to 2D imaging. The other advanced imaging methods, such as scanning electron ...

      Read Full Article
    3. Non-destructive mapping of stress and strain in soft thin films through sound waves

      Non-destructive mapping of stress and strain in soft thin films through sound waves

      Measuring the in-plane mechanical stress in a taut membrane is challenging, especially if its material parameters are unknown or altered by the stress. Yet being able to measure the stress is of fundamental interest to basic research and practical applications that use soft membranes, from engineering to tissues. Here, we present a robust non-destructive technique to measure directly in-situ stress and strain in soft thin films without the need to calibrate material parameters. Our method relies on measuring the speed of elastic waves propagating in the film. Using optical coherence tomography, we verify our method experimentally for a stretched rubber ...

      Read Full Article
    4. A scalable, Rotating Disc Bioelectrochemical Reactor (RDBER) suitable for the cultivation of both cathodic and anodic biofilms

      A scalable, Rotating Disc Bioelectrochemical Reactor (RDBER) suitable for the cultivation of both cathodic and anodic biofilms

      The question of whether microbial electrochemical technologies can carve a niche in a future sustainable economy will strongly depend on the availability of suitable reactor technology. However, examples of new, scalable reactor concepts or even scale-ups specifically for microbial electrosynthesis applications are rarely described in the literature. Here, we present a membrane-less reactor system suitable for different bioelectrochemical applications. The system employs rotating graphite disks with a diameter of 210 mm as working electrodes with a total surface area of 1 m 2 . Given the reactor volume of 10 L, this results in a surface-to-volume ratio of 100:1 m ...

      Read Full Article
    5. Application and Performance Discussion of Fiber-Reinforced Composite Materials in Sports Equipment Based on Image Processing Technology

      Application and Performance Discussion of Fiber-Reinforced Composite Materials in Sports Equipment Based on Image Processing Technology

      Fiber reinforced composites can meet the needs of lightweight, heavy load, long-span, high strength, and modern structures and work under strict conditions. Therefore, it is widely used in various fields. Sports equipment generally cannot meet the requirements of high-strength use, so there is an urgent need for new fiber materials to make these instruments. Aiming at improving the efficiency of measurement and the reliability of measurement results, this paper studies the quantitative characterization method of the microstructure of short fiber reinforced composites. The swept-frequency OCT system is a newly developed high-resolution biomedical imaging system. The method of this paper is ...

      Read Full Article
    6. Processing apparatus, fingerprint image extraction processing apparatus, system, processing method, and computer readable medium

      Processing apparatus, fingerprint image extraction processing apparatus, system, processing method, and computer readable medium

      A technique for accurately extracting a fingerprint image for accurate authentication from 3D tomographic luminance data of a finger at a high speed. A processing apparatus (11) according to the present disclosure includes means for, after performing edge detection processing on a tomographic image (101, 102, . . . 10 k, . . . , 10n) at each depth, calculating the total number of edge pixels in the tomographic image from 3D (three-dimensional) tomographic luminance data, and acquiring depth dependence of the number of edges (111, 112), and means for extracting a tomographic image having a striped pattern from the depth dependence of the number of edges ...

      Read Full Article
    7. Whey Recovery Using Nanofiltration-like Forward Osmosis: Optical Coherence Tomography Based Approach to Understanding Fouling Behavior

      Whey Recovery Using Nanofiltration-like Forward Osmosis: Optical Coherence Tomography Based Approach to Understanding Fouling Behavior

      Recovering nourishing compounds is of essential significance in the treatment of whey wastewater. It is desirable to enhance the efficiency of whey recovery by forward osmosis (FO) with a nanofiltration (NF)-like membrane, though there is a fundamental challenge standing in the way of investigating the harmful effects of membrane fouling. Optical coherence tomography (OCT) was explored to in situ characterize the fouling behavior in the NF-like FO process for whey recovery. The scientific focus was on the use of a divalent salt as the draw solute, which was required to maintain the transmembrane osmotic pressure difference but could have ...

      Read Full Article
    8. Towards in-situ diagnostics of multi-photon 3D laser printing using optical coherence tomography

      Towards in-situ diagnostics of multi-photon 3D laser printing using optical coherence tomography

      In recent years, multi-photon 3D laser printing has become a widely used tool for the fabrication of micro- and nanostructures for a large variety of applications. Typically, thorough sample characterisation is key for an efficient optimisation of the printing process. To date, three-dimensional microscopic inspection has usually been carried out on finished 3D printed microstructures, that is, using ex-situ approaches. In contrast, in-situ 3D characterization tools are desirable for quickly assessing the quality and properties of 3D printed microstructures. Along these lines, we present and characterise a Fourier-domain optical coherence tomography (FD-OCT) system that can be readily integrated into an ...

      Read Full Article
    9. A novel approach for forensic identification of automotive paints using optical coherence tomography and multivariate statistical methods

      A novel approach for forensic identification of automotive paints using optical coherence tomography and multivariate statistical methods

      Automotive paint is one of the most important evidence in solving vehicle-related criminal cases. It contains the critical information about the suspected vehicle, providing essential clues for the investigation. In this study, a novel approach based on optical coherence tomography combined with multivariate statistical methods was proposed to facilitate rapid, accurate and nondestructive identification of different brands of automotive paints. 164 automotive paint samples from 8 different manufacturers were analyzed by a spectral-domain optical coherence tomography system (SD-OCT). Two-dimensional cross-sectional OCT images and three-dimensional OCT reconstruction of vehicle paints of different paints were obtained to show the internal structural differences ...

      Read Full Article
    10. Synthetic periphyton as a model system to understand species dynamics in complex microbial freshwater communities

      Synthetic periphyton as a model system to understand species dynamics in complex microbial freshwater communities

      Phototrophic biofilms, also known as periphyton, are microbial freshwater communities that drive crucial ecological processes in streams and lakes. Gaining a deep mechanistic understanding of the biological processes occurring in natural periphyton remains challenging due to the high complexity and variability of such communities. To address this challenge, we rationally developed a workflow to construct a synthetic community by co-culturing 26 phototrophic species (i.e., diatoms, green algae, and cyanobacteria) that were inoculated in a successional sequence to create a periphytic biofilm on glass slides. We show that this community is diverse, stable, and highly reproducible in terms of microbial ...

      Read Full Article
    11. Nondestructive in situ monitoring of pea seeds germination using optical coherence tomography

      Nondestructive in situ monitoring of pea seeds germination using optical coherence tomography

      Seed germination and uniform plant stand in the field are the most critical crop growth stages determining the final yield. Pea ( Pisum sativum L .) seeds production is often hampered due to the seed dormancy caused by the hard seed coat. Such effect is mainly attributed to poor or uneven germination and unsynchronised seedling emergence. Understanding the time course of water intake and several critical germination indicators can reveal many features of seed germination such as rate and uniformity. This paper used optical coherence tomography (OCT), a noninvasive and cross-sectional imaging technique, to monitor the inner structural changes throughout the germination ...

      Read Full Article
    12. Revealing how maltodextrin-containing droplets dry using optical coherence tomography

      Revealing how maltodextrin-containing droplets dry using optical coherence tomography

      Properties of powders produced from drying solute-containing droplets arise from the dynamic redistribution of solute during drying. While insights on the dynamic redistribution are instrumental for the rational design of powders and for the optimized operation of equipment such as spray dryers, experimental techniques that allow measuring the spatio-temporal concentration of solute in drying droplets are scarce. In this work, we explore and demonstrate the use of optical coherence tomography (OCT) to measure the spatio-temporal concentration of solute in drying droplets and the development of a solidifying shell at the liquid-air interface, using aqueous droplets of maltodextrin as a model ...

      Read Full Article
    13. Structural and optical characterization of banknotes using spectral-domain optical coherence tomography

      Structural and optical characterization of banknotes using spectral-domain optical coherence tomography

      Counterfeiting of banknotes remains a severe threat to economic security and social stability. The characterization of banknote has mainly relied on the assessment of various security features applied to the surface of the note. However, the surface features are easy to forge and contain insufficient information to discover the source. In this paper, a novel approach for banknote characterization has been proposed by employing spectral-domain optical coherence tomography (SD-OCT) that can provide structural and optical features. Three groups of counterfeit Chinese 100 Yuan banknotes produced by different printing manners and one group of authentic banknotes were examined by SD-OCT without ...

      Read Full Article
    14. The Use of Optical Coherence Tomography to Demonstrate Dark and Light Adaptation in a Live Moth

      The Use of Optical Coherence Tomography to Demonstrate Dark and Light Adaptation in a Live Moth

      To work effectively, the eyes of nocturnal insects have a problem they must overcome. During the night, the light levels are low, so their eyes need to be very sensitive; but they also need a way of adapting to environmental light conditions, and protecting those sensitive organs, if a bright light is encountered. Human eyes have a pupil that changes size to regulate light input to the eye. Moths (Lepidoptera) use a light absorbing pigment that moves position to limit the light within the eye. This pigment migration is difficult to record because it is a dynamic process and will ...

      Read Full Article
    15. Dynamic full-field optical coherence tomography as complementary tool in fungal diagnostics

      Dynamic full-field optical coherence tomography as complementary tool in fungal diagnostics

      Histopathology and microscopic examination of infected tissue are the gold standards to prove the diagnosis of invasive fungal infection (IFI). Yet, they suffer from essential limitations that hamper rapid diagnosis and require the future development of new imaging tools dedicated to fungal diagnostics. To this end, the present work introduces the first use of dynamic full-field optical coherence tomography (D-FF-OCT) for the visualization of microscopic filamentous fungi. Data collected from the observation of three different fungal species (Nannizzia gypsea, Aspergillus fumigatus and Rhizopus arrhizus) confirm the ability of D-FF-OCT to visualize not only the main structures of all selected fungal ...

      Read Full Article
    16. Shedding light on the impact of microplastics on lentil seedling growth

      Shedding light on the impact of microplastics on lentil seedling growth

      Microplastic pollution is known to negatively impact seed germination and seedling growth. Although some studies have demonstrated the effects of microplastics on seed germination, the impact of microplastics on the internal biological activity of seeds remained unknown. Now, a group of researchers has used biospeckle optical coherence tomography to reveal that microplastics significantly hinder the internal activity in lentil seeds during germination and can lead to stunted growth at later stages.

      Read Full Article
    17. Polyamide (PA) 66 molding defect studied with optical coherence tomography (OCT) and near-infrared (NIR) spectroscopy

      Polyamide (PA) 66 molding defect studied with optical coherence tomography (OCT) and near-infrared (NIR) spectroscopy

      An optical coherence tomography (OCT) system combined with near-infrared spectroscopy (NIRS) was developed to carry out simultaneously the cross-sectional observation and spectral measurement of a specific area inside a polymer sample. This OCT-NIRS system consists of a fiber-optic-based spectrometer combined with an OCT system and enables non-invasive imaging up to a depth of several millimeters and the recording of the NIR spectrum in the observed area. A subsequent analysis of the collected data will provide key information revealing the way in which the microscopic structure of the polymer is affected by the chemical composition around it. A structural defect inside ...

      Read Full Article
    18. Effects of microplastics on lentil (Lens culinaris) seed germination and seedling growth

      Effects of microplastics on lentil (Lens culinaris) seed germination and seedling growth

      Widespread use of plastics and mishandling has resulted in severe environmental issues affecting seed germination and seedling growth. This study investigates the effect of polyethylene microplastics (740–4990 nm PEMPs) on lentil ( Lens culinaris ) seed germination and seedling growth using Biospeckle Optical Coherence Tomography (bOCT), a technique that we successfully demonstrated earlier in visualizing the internal activity of plants. Lentil seeds were exposed to PEMPs bioassay for seven days with 10, 50, and 100 mg L −1 concentrations. The average speckle contrast was calculated after 0 h, 6 h, 12 h, and 24 h of exposure, and statistically significant differences ...

      Read Full Article
    19. In-process monitoring in laser grooving with line-shaped femtosecond pulses using optical coherence tomography

      In-process monitoring in laser grooving with line-shaped femtosecond pulses using optical coherence tomography

      A line-shaped beam is useful for increasing the processing speed in laser grooving and scribing. In laser grooving, depth control of the processed structure is important for performing precise processing. In this paper, in-process monitoring of the depth of a structure formed by femtosecond laser processing with a line-shaped beam using swept-source optical coherence tomography (SS-OCT) was demonstrated. In the evaluation of the SS-OCT system, the depth resolution, measurement accuracy, and axial measurable range were 15.8 μm, ±2.5 μm and 5.3 mm, respectively. In laser grooving, the structural shape and the distribution of deposited debris were successfully ...

      Read Full Article
    20. Method and device for contactless and non-destructive determination of the layer thicknesses of lacquer layers of vehicle parts

      Method and device for contactless and non-destructive determination of the layer thicknesses of lacquer layers of vehicle parts

      A method for contactless and non-destructive determination of the layer thicknesses of lacquer layers of vehicle parts is disclosed. In addition, the invention relates to a device to determine and measure the lacquer layers of vehicle part, the device constructed for performing optical coherence tomography and includes at least one radiation source for providing electromagnetic radiation and the electromagnetic radiation provides a wavelength (.lamda.)

      Read Full Article
    21. Identification of Fungus-infected Tomato Seeds Based on Full-Field Optical Coherence Tomography

      Identification of Fungus-infected Tomato Seeds Based on Full-Field Optical Coherence Tomography

      The morphological changes of anthracnose (fungus) -infected tomato seeds have been studied to identify the infection and characterize its effect. Full-field optical coherence tomography (FF-OCT) has been utilized as a nondestructive but efficient modality for visualizing the effects of fungal infection. The cross-sectional images extracted from a stack of en face FF-OCT images showed significant changes with infection in the seed structure. First of all, the seed coat disappeared with the infection. The thickness of the seed coat of a healthy seed was measured as 28.2 ㎛, with a standard deviation of 1.2 ㎛. However, for infected seeds the gap ...

      Read Full Article
    22. Project Team Become Third Place Finalists for the Innovation Award Laser Technology 2022 - OCT process monitoring for on-the-fly laser welding and additive manufacturing impresses the jury

      Project Team Become Third Place Finalists for the Innovation Award Laser Technology 2022 - OCT process monitoring for on-the-fly laser welding and additive manufacturing impresses the jury

      A team from the sister companies Blackbird Robotersysteme GmbH and SCANLAB GmbH submitted a joint solution for the Innovation Award Laser Technology 2022. On May 4, the project team was awarded third place for its innovative scan solution with integrated OCT process monitoring. The system primarily impresses due to its flexibility and high practical suitability for the automotive sector. The ability to synchronize scanner and sensor data developed in-house also enables use in other application areas such as additive manufacturing. The renowned prize is awarded by the associations AKL Arbeitskreis Lasertechnik e.V. and the ELI (European Laser Institute) at ...

      Read Full Article
    23. Optical Coherence Tomography Ensures Quality of Thin Films

      Optical Coherence Tomography Ensures Quality of Thin Films

      The Fraunhofer Institute for Production Technology IPT in Aachen, Germany, has developed an interferometric measurement method that can be used to reliably measure whether thin transparent layers of paint have been applied evenly: The possibilities offered by optical coherence tomography (OCT) for measuring such paint layers will be presented at CONTROL 2022 by the Fraunhofer IPT using a prototype.

      Read Full Article
    24. Control 2022: Optical coherence tomography ensures the quality of thin films

      Control 2022: Optical coherence tomography ensures the quality of thin films

      From high-gloss brochures to new cars: paint layers that are also supposed to shine in front of customers must be smooth and even to reflect perfect quality. The Fraunhofer Institute for Production Technology IPT in Aachen, Germany, has developed an interferometric measurement method that can be used to reliably measure whether thin transparent layers of paint have been applied evenly: The possibilities offered by optical coherence tomography (OCT) for measuring such paint layers will be presented to the trade fair public by the Fraunhofer IPT using a prototype at Control, the leading international trade fair for quality assurance from May ...

      Read Full Article
    1-24 of 528 1 2 3 4 ... 20 21 22 »
  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. Popular Articles

  3. Organizations in the News

    1. (1 articles) Karlsruhe Institute of Technology
    2. (1 articles) Carnegie Mellon University
    3. (1 articles) Harvard University
    4. (1 articles) University of Sheffield
    5. (1 articles) Massachusetts General Hospital
    6. (1 articles) National University of Ireland, Galway
  4. OCT Companies in the News

    1. (1 articles) Thorlabs