1. Articles in category: Other Non-Medical

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    1. EXALOS Achieves a New Milestone for Next Generation Display Technologies with its First Cyan-Green Superluminescent Light Emitting Diode (SLED)

      EXALOS Achieves a New Milestone for Next Generation Display Technologies with its First Cyan-Green Superluminescent Light Emitting Diode (SLED)

      EXALOS, the world’s leading developer of visible Superluminescent Light Emitting Diodes (SLEDs), has successfully produced its first cyan-green SLED. With an output wavelength of 495 nm in between the company’s existing red (640 nm, GaAs) and blue (450 nm, GaN) devices, this SLED represents a major step toward a complete red-green-blue (RGB) SLED illumination source for micro-displays in augmented reality applications, head-up display architectures, etc. SLEDs are broadband semiconductor devices that are closely related to their more commonly known relatives, laser diodes (LDs) and light-emitting diodes (LEDs). Following the successful demonstration of blue SLEDs, Exalos embarked upon a ...

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      Mentions: Exalos
    2. Fouling development in direct contact membrane distillation: Non-invasive monitoring and destructive analysis

      Fouling development in direct contact membrane distillation: Non-invasive monitoring and destructive analysis

      Fouling development in direct contact membrane distillation (DCMD) for seawater desalination was evaluated combining in-situ monitoring performed using optical coherence tomography (OCT) together with destructive techniques. The non-invasive monitoring with OCT provided a better understanding of the fouling mechanism by giving an appropriate sampling timing for the membrane autopsy. The on-line monitoring system allowed linking the flux trend with the structure of fouling deposited on the membrane surface. The water vapor flux trend was divided in three phases based on the deposition and formation of different foulants over time. The initial flux decline was due to the deposition of a ...

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    3. Quantification of particulate matter attached to the bulk-biofilm interface and its influence on local mass transfer

      Quantification of particulate matter attached to the bulk-biofilm interface and its influence on local mass transfer

      A large fraction of the chemical oxygen demand (COD) in municipal wastewater is associated with the particulate matter. The presence of these particles might impose a negative impact on the mass transfer in biofilm systems when they attach to the bulk-biofilm interface. We thus investigated the impact of real wastewater particles by combining optical coherence tomography (OCT) and oxygen microsensor measurements. The deposition of wastewater particles of different size classes onto the biofilm surface was captured in 3D by means of OCT in a lab-scale flume. The thickness of the particle layer was calculated from OCT images. The influence of ...

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    4. Defect inspection of actuator lenses using swept-source optical coherence tomography

      Defect inspection of actuator lenses using swept-source optical coherence tomography

      Actuator lens industries have gained an enormous interest with the enhancement of various latest communication devices, such as mobile phone and notebooks. The quality of the aforementioned devices can be degraded due to the internal defects of actuator lenses. Therefore, in this study, we implemented swept-source optical coherence tomography (SS-OCT) system to inspect defects of actuator lenses. Owing to the high-resolution of the SS-OCT system, defected foreign substances between the actuator lenses, defective regions of lenses and surface stains were more clearly distinguished through three-dimensional (3D) and two-dimensional (2D) cross-sectional OCT images. Therefore, the implemented SS-OCT system can be considered ...

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    5. Avinger Receives CE Marking Approval for Next Generation Pantheris Image-Guided Atherectomy Device

      Avinger Receives CE Marking Approval for Next Generation Pantheris Image-Guided Atherectomy Device

      Avinger, Inc. (NASDAQ:AVGR), a leading developer of innovative treatments for peripheral artery disease (PAD), today announced Conformité Européenne (CE) Marking approval for its next generation Pantheris Lumivascular atherectomy system, the first-ever image-guided atherectomy device for the treatment of PAD. The novel design features of the next generation of Pantheris include a simplified single balloon system for both apposition of the device and occlusion of blood flow, a stiffer shaft for increased pushability, a more robust nose cone with the option for more tissue storage capacity, and an enhanced cutter design. “CE Marking approval to market and sell our ...

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      Mentions: Avinger
    6. BMW tests optical coherence tomography for better welding

      BMW tests optical coherence tomography for better welding

      Germany’s Federal Ministry of Education and Research (BMBF) has backed a project to explore the potential of optical coherence tomography (OCT) to improve remote laser welding in car production. Funded under the country’s “Photonics Research Germany” program, the effort includes representatives from auto giant BMW, who will work alongside laser welding and OCT experts at Precitec, Blackbird Robotersysteme, Emil Bucher, and the Technical University of Munich. The project utilizes a Blackbird scanner comprising an “intelliWELD” PR scan head provided by Scanlab , a control unit, and an integrated OCT scanner. The team adds that imaging relies on ultra-fast workpiece ...

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    7. Characterization of the Coating and Tablet Core Roughness by Means of 3D Optical Coherence Tomography

      Characterization of the Coating and Tablet Core Roughness by Means of 3D Optical Coherence Tomography

      This study demonstrates the use of optical coherence tomography (OCT) to simultaneously characterize the roughness of the tablet core and coating of pharmaceutical tablets. OCT is a high resolution non-destructive and contactless imaging methodology to characterize structural properties of solid dosage forms. Besides measuring the coating thickness, it also facilitates the analysis of the tablet core and coating roughness. An automated data evaluation algorithm extracts information about coating thickness, as well as tablet core and coating roughness. Samples removed periodically from a pan coating process were investigated, on the basis of thickness and profile maps of the tablet core and ...

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      Mentions: Daniel Markl
    8. In Vivo Non-Destructive Monitoring of Capsicum Annuum Seed Growth with Diverse NaCl Concentrations Using Optical Detection Technique

      In Vivo Non-Destructive Monitoring of Capsicum Annuum Seed Growth with Diverse NaCl Concentrations Using Optical Detection Technique

      We demonstrate that optical coherence tomography (OCT) is a plausible optical tool for in vivo detection of plant seeds and its morphological changes during growth. To investigate the direct impact of salt stress on seed germination, the experiment was conducted using Capsicum annuum seeds that were treated with different molar concentrations of NaCl. To determine the optimal concentration for the seed growth, the seeds were monitored for nine consecutive days. In vivo two-dimensional OCT images of the treated seeds were obtained and compared with the images of seeds that were grown using sterile distilled water. The obtained results confirm the ...

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    9. The Validity of the Diagnosis of Plant Leaf Infections Using Non-Destructive Optical Inspection Technique and Depth-Scan Signal Analysis

      The Validity of the Diagnosis of Plant Leaf Infections Using Non-Destructive Optical Inspection Technique and Depth-Scan Signal Analysis

      The applicability of non-destructive optical imaging technique for the diagnosis of infected leaf materials was investigated along with a depth-scan (amplitude depth profile) signal analysis. The experimented plant leaf specimens were collected from persimmon plantations and the specimens were categorized into three groups: healthy leaf specimens, infected leaf specimens, and apparently healthy leaf specimens collected from infected trees. The non-destructive diagnosis was performed using 840 nm spectral domain optical coherence tomography (SD-OCT) system. The obtained OCT results confirmed that the proposed method is capable of identifying morphological differences between healthy specimens from infected specimens and partially infected specimens. Therefore, this ...

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    10. Feature Of The Week 09/17/2017: Non-Destructive Analysis of the Internal Anatomical Structures of Mosquito Specimens Using Optical Coherence Tomography

      Feature Of The Week 09/17/2017: Non-Destructive Analysis of the Internal Anatomical Structures of Mosquito Specimens Using Optical Coherence Tomography

      The study of mosquitoes and analysis of their behavior are of crucial importance in the on-going efforts to control the alarming increase in mosquito-borne diseases. Furthermore, a non-destructive and real-time imaging technique to study the anatomical features of mosquito specimens can greatly aid the study of mosquitoes. In this study, we demonstrate the three-dimensional imaging capabilities of optical coherence tomography (OCT) for structural analysis of Anopheles sinensis mosquitoes. The anatomical features of An. sinensis head, thorax, and abdominal regions, along with the morphology of internal structures, such as foregut, midgut, and hindgut, were studied using OCT imaging. Two-dimensional and three-dimensional ...

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    11. High Resolution Optical Frequency Domain Reflectometry for Analyzing Intra-Chip Reflections

      High Resolution Optical Frequency Domain Reflectometry for Analyzing Intra-Chip Reflections

      We present a method for high-resolution optical frequency domain reflectometry by de-embedding group-velocity dispersion in the device under test. The method is shown to provide an accurate estimation of the wavelength-dependent group refractive index, and provides a spatial resolution of 5.3 ± 1.7µm for intra-chip reflections. We applied this method to characterize localized reflections from a number of waveguide crossings. The minimum distance of 30µm between two crossings could easily be resolved. The reflection of waveguide crossings was analyzed to be (2.5 ± 1.2) · 10−6.

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    12. System and method for fingerprint validation

      System and method for fingerprint validation

      The invention provides a system and method for rapid validation of identity from tissue using registered two dimensional and optical coherence tomography (OCT) scan images. The preferred embodiment provides, for a human fingerprint, validation that the surface fingerprint matches the primary fingerprint. An alternate embodiment provides validation of "aliveness" by ascertaining blood flow. Various embodiments are taught.

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    13. New Non-invasive Techniques to Quantify Skin Surface Strain and Sub-surface Layer Deformation of Finger-pad during Sliding

      New Non-invasive Techniques to Quantify Skin Surface Strain and Sub-surface Layer Deformation of Finger-pad during Sliding

      tudies on the variation of skin properties with gender, age and anatomical region, with regards to interaction with different materials have resulted in significant research output. Investigations on skin surface strain and sub-surface layer deformation during sliding, however, have not received as much attention. This novel study uses two non-invasive techniques, optical coherence tomography (OCT) and digital image correlation (DIC), to measure properties of the index finger of a 25 year old female when under normal and shear loading. Measurements were taken during static, and for the first time, dynamic phases. It was observed that the number of ridges in ...

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    14. Downhole sensing via swept source lasers

      Downhole sensing via swept source lasers

      Systems and methods for performing downhole analysis within a well bore employ a swept source laser that can be sent downhole to generate high resolution images of the well bore. Various embodiments can also determine other physical properties of a below ground structure. The swept source lasers can create images using low-coherence interferometry or optical coherence tomography. Systems and methods may also be used to determine fluid flow rates towards the sensor at discrete points, such as individual perforations, by measuring the Doppler effect on the light back-scattered from the fluid. Fluid flow information could also be extracted by measuring ...

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    15. Compact Imaging Teams with SRI International for Dynamic Biometrics Development under IARPA Odin Program

      Compact Imaging Teams with SRI International for  Dynamic Biometrics Development under IARPA Odin Program

      Compact Imaging, Inc. (CI) today announced that SRI International has selected CI’s non-invasive depth scanning sensor, MRO™, as a critical component in the development of “dynamic biometrics” for improved detection of attempts to evade or deceive biometric security systems, such as fingerprint scanners. The development is being performed under a multi-year contract awarded to SRI as part of IARPA’s (Intelligence Advanced Research Projects Activity, National Intelligence Directorate) Odin Program. The goal of the Odin Program is to develop advanced technologies to detect “presentation attacks,” as attempts to deceive biometric security systems are often called. Conventional biometrics, such as ...

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    16. Investigating the influence of organic matter composition on biofilm volumes in reverse osmosis using optical coherence tomography

      Investigating the influence of organic matter composition on biofilm volumes in reverse osmosis using optical coherence tomography

      Biofouling, a critical issue in membrane filtration, is influenced by several factors such as membrane characteristics and feed water quality. The organic matter (OM) composition is known to significantly influence biofilm formation, but few studies on this subject have been reported. Optical coherence tomography (OCT) allows direct monitoring of biofilm development on the membrane surface without the need for membrane autopsy. The purposes of the present study are 1) to quantify biofouling formation on a membrane surface using OCT; 2) to monitor the temporal variation of OM composition during membrane formation; and 3) to investigate the variation of OM composition ...

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    17. Classification of Fingerprints Captured Using Optical Coherence Tomography

      Classification of Fingerprints Captured Using Optical Coherence Tomography

      We propose a technique for analysis of fingerprints scanned free-air (not pressed against a glass) with Optical Coherence Tomography (OCT). Fingerprints from the surface and subdermal parts of the finger are extracted from a 2 GB volumetric scan in cca. 2 s using our specialized technique and GPU acceleration on GeForce GTX 980. The technique provides fingerprints that perform with promising error rates that demonstrate the potential of the OCT for improved fingerprint identification, as well as its potential for prevention of biometric spoofing (PAD).

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    18. Elastic turbulence in entangled semi-dilute DNA solutions measured with optical coherence tomography velocimetry

      Elastic turbulence in entangled semi-dilute DNA solutions measured with optical coherence tomography velocimetry

      The flow instabilities of solutions of high molecular weight DNA in the entangled semi-dilute concentration regime were investigated using optical coherence tomography velocimetry, a technique that provides high spatial (probe volumes of 3.4 pL) and temporal resolution (sub μs) information on the flow behaviour of complex fluids in a rheometer. The velocity profiles of the opaque DNA solutions (high and low salt) were measured as a function of the distance across the gap of a parallel plate rheometer, and their evolution over time was measured. At lower DNA concentrations and low shear rates, the velocity fluctuations were well described ...

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    19. Discriminating hidden bruises in loquat by attenuation coefficients estimated from optical coherence tomography images

      Discriminating hidden bruises in loquat by attenuation coefficients estimated from optical coherence tomography images

      Hidden bruising is considered as one of the difficulties during loquat quality control, which has made an impact on postharvest quality and storability. Optical coherence tomography (OCT) is used as a non-destructive method that acquires 2D images of the sub-surface structure of the loquat. After OCT image processing, the attenuation coefficients ( μ t ) of the regions of interests are fitted to quantitatively analyze the characteristics of loquat tissue through using a confocal signal scattering model from OCT A-scan signals. In this experiment, a total of 60 loquat samples are investigated, with the non-bruised tissue having a large μ t with a mean ...

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    20. Investigation of the internal structure of hemp fibres using optical coherence tomography and Focused Ion Beam transverse cutting

      Investigation of the internal structure of hemp fibres using optical coherence tomography and Focused Ion Beam transverse cutting

      The use of plant fibres in composite applications requires an efficient characterisation of their mechanical properties and thus an accurate description of their internal structure. The review of literature points out that there is still a lack of data on the organisation and structure of bast fibres. In this study, we propose to investigate the internal structure of hemp fibres using two experimental techniques: Focused Ion Beam (FIB) microscopy and optical coherence tomography (OCT). Results indicate that OCT, a non-destructive and non-invasive technique, is a powerful technique to quickly and easily describe the internal structure of fibres and also to ...

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      Mentions: Luc Froehly
    21. Scan-Less Line Field Optical Coherence Tomography, with Automatic Image Segmentation, as a Measurement Tool for Automotive Coatings

      Scan-Less Line Field Optical Coherence Tomography, with Automatic Image Segmentation, as a Measurement Tool for Automotive Coatings

      The measurement of the thicknesses of layers is important for the quality assurance of industrial coating systems. Current measurement techniques only provide a limited amount of information. Here, we show that spectral domain Line Field (LF) Optical Coherence Tomography (OCT) is able to return to the user a cross sectional B-Scan image in a single shot with no mechanical moving parts. To reliably extract layer thicknesses from such images of automotive paint systems, we present an automatic graph search image segmentation algorithm. To show that the algorithm works independently of the OCT device, the measurements are repeated with a separate ...

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      Mentions: Yalin Zheng
    22. Optical Coherence Tomography Reveals Coral Structure, Response to Environmental Stress

      Optical Coherence Tomography Reveals Coral Structure, Response to Environmental Stress

      Brightfield imaging and epifluorescence microscopy have been used to observe living coral, but with limited depth and areal resolution due to the opaque coral tissue, which is composed of different cell layers, and diffuse backscatter from the underlying coral skeleton. Use of visible light for these observations can also impact the coral, e.g., by stimulating photosynthesis or by exposure to potentially harmful UV and blue light. Employing optical coherence tomography (OCT), researchers at the Faculty of Science, University of Copenhagen , have found a way around these obstacles. Michael Kühl of the Department of Biology explained, “OCT is an ...

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    23. In vivo observation of metamorphosis of Plodia interpunctella Hübner using three-dimensional optical coherence tomography

      In vivo observation of metamorphosis of Plodia interpunctella Hübner using three-dimensional optical coherence tomography

      Morphological assessment and three-dimensional reconstructions of internal structures of Plodia interpunctella Hübner during metamorphosis stages were experimentally demonstrated using optical coherence tomography (OCT) for the first time. The conventional, complex sectioning methods were significantly simplified owing to the non-invasive three-dimensional imaging capability of OCT. Further, this study demonstrates the use of OCT as a non-invasive detection tool for in vivo morphological observation of metamorphosis stages to gain a better understanding about the growth of internal organs, which can be considered a useful discovery in the field of entomology. Thus, the metamorphosis stages starting from the larva, three pupa stages ...

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