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Добірка наукової літератури з теми "Non-imaging fiber optic system"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "Non-imaging fiber optic system"

1

Michael Angel, S., H. Trey Skinner, and Brian J. Marquardt. "Imaging Spectroscopy Using Fiber Optics." Microscopy and Microanalysis 3, S2 (August 1997): 845–46. http://dx.doi.org/10.1017/s1431927600011119.

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Анотація:
Optical fiber probes are routinely used with optical spectrometers to allow measurements to be made on remotely located samples. In most of these systems, however, the optical fibers are used as non-imaging “light pipes” for the transmission of laser light, and luminescence or Raman signals to and from the sample. Thus, while these systems are suitable for remote spectroscopy, they are limited to single-point measurements. In a recent paper, we showed that a small-diameter (i.e., 350 μm) coherent optical fiber bundle can be combined with an AOTF-based imaging spectrometer for fluorescence and Raman spectral micro-imaging with increased flexibility in terms of sample positioning and in-situ capabilities. The previous paper described the operation of the fiber-optic microimaging probe and AOTF imaging system and showed preliminary Raman and fluorescence images for model compounds with 4 μm resolution. We have extended this work to include a discussion of the lateral and vertical spatial resolution of the fiber-optic microprobe in a non-contact proximity-focused configuration.
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2

Chen, Lujie, Viswanath Bavigadda, Theodoros Kofidis, and Robert D. Howe. "Fiber Optic Projection-Imaging System for Shape Measurement in Confined Space." Scientific World Journal 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/206569.

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A fiber-based projection-imaging system is proposed for shape measurement in confined space. Owing to the flexibility of imaging fibers, the system can be used in special scenarios that are difficult for conventional experimental setups. Three experiments: open space, closed space, and underwater are designed to demonstrate the strength and weakness of the system. It is shown that when proper alignment is possible, relatively high accuracy can be achieved; the error is less than 2% of the overall height of a specimen. In situations where alignment is difficult, significantly increased error is observed. The error is in the form of gross-scale geometrical distortion; for example, flat surface is reconstructed with curvature. In addition, the imaging fibers may introduce fine-scale noise into phase measurement, which has to be suppressed by smoothing filters. Based on results and analysis, it is found that although a fiber-based system has its unique strength, existing calibration and processing methods for fringe patterns have to be modified to overcome its drawbacks so as to accommodate wider applications.
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3

Phillips, Brennan T., Nicholas Chaloux, Russell Shomberg, Adriana Muñoz-Soto, and Jim Owens. "The Fiber Optic Reel System: A Compact Deployment Solution for Tethered Live-Telemetry Deep-Sea Robots and Sensors." Sensors 21, no. 7 (April 4, 2021): 2526. http://dx.doi.org/10.3390/s21072526.

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Анотація:
Tethered deep-sea robots and instrument platforms, such as Remotely Operated Vehicles (ROVs) and vertical-profiling or towed instrument arrays, commonly rely on fiber optics for real-time data transmission. Fiber optic tethers used for these applications are either heavily reinforced load-bearing cables used to support lifting and pulling, or bare optical fibers used in non-load bearing applications. Load-bearing tethers directly scale operations for deep-sea robots as the cable diameter, mass, and length typically require heavy winches and large surface support vessels to operate, and also guide the design of the deep-sea robot itself. In an effort to dramatically reduce the physical scale and operational overhead of tethered live-telemetry deep-sea robots and sensors, we have developed the Fiber Optic Reel System (FOReelS). FOReelS utilizes a customized electric fishing reel outfitted with a proprietary hollow-core braided fiber optic fishing line and mechanical termination assembly (FOFL), which offers an extremely small diameter (750 μm) load-bearing (90 lb/400 N breaking strength) tether to support live high-bandwidth data transmission as well as fiber optic sensing applications. The system incorporates a novel epoxy potted data payload system (DPS) that includes high-definition video, integrated lighting, rechargeable battery power, and gigabit ethernet fiber optic telemetry. In this paper we present the complete FOReelS design and field demonstrations to depths exceeding 780 m using small coastal support vessels of opportunity. FOReelS is likely the smallest form factor live-telemetry deep-sea exploration tool currently in existence, with a broad range of future applications envisioned for oceanographic sensing and communication.
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4

Fedotov, M. Yu, O. N. Budadin, and S. O. Kozel’skaya. "TECHNOLOGICAL ASPECTS OF CREATING A FIBER-OPTIC NON-DESTRUCTIVE TESTING OF SANDWICH COMPOSITE STRUCTURES." Kontrol'. Diagnostika, no. 253 (July 2019): 24–29. http://dx.doi.org/10.14489/td.2019.07.pp.024-029.

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Анотація:
The results of research on the formation of the system of built-in non-destructive testing of linings of composite three-layer structures by an optical method using fiber-optic sensors based on fiber Bragg gratings are presented. The features of creating an input/output zone for fiber-optic sensors as applied to three-layer composite structures are studied. Recommendations for ensuring the integrity and optimal functioning of the fiber-optic monitoring system as applied to a real three-layer composite structure are formulated. The following is shown. The process of creating an integrated control system of three-layer composite structures by an optical method using integrated fiber-optic sensors includes a number of operations to form a topology and to ensure the output of fiber-optic sensors from composite claddings in a single technological cycle of manufacturing the structure according to the standard technological process without significantly adjusting it, which is extremely important in relation to serial technologies. When developing the technology of integrating fiber-optic sensors into a three-layer composite structure, it was experimentally shown that from the point of view of survivability and preservation of the efficiency of the embedded control system, it is necessary to fulfill a number of requirements for the placement and output of fiber-optic sensors taking into account the characteristics of manufacturing, machining, and operation designs. Thus, it is advisable to place fiber optic sensors in the casings at least 5 mm from the intended edge of the structure, at least 2 layers from the outer surface of the structure and not less than 5 layers from the honeycomb core. The fiber bend radius should be at least 30 mm to prevent mechanical burst and sharp bending of the signal when it is bending. Fiber optic sensors are recommended to be placed between layers with a reinforcement scheme in the direction of the fiber optic sensor, however placement is also allowed between the fiber sensors and one layer with a different direction of reinforcement, while in order to prevent fractures, computation fiber optic sensors overlap is unacceptable, thus, between crossover fiber-optic sensors must be at least 2 layers of prepreg.
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5

Moreau, Frédérick, Sandrine M. Moreau, Dennis M. Hueber, and Tuan Vo-Dinh. "Fiber-Optic Remote Multisensor System Based on an Acousto-Optic Tunable Filter (AOTF)." Applied Spectroscopy 50, no. 10 (October 1996): 1295–300. http://dx.doi.org/10.1366/0003702963904917.

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Анотація:
This paper describes a new fiber-optic multisensor based on an acousto-optic tunable filter (AOTF) and capable of remote sensing using a multioptical fiber array (MOFA). A two-dimensional charge-coupled device (CCD) was used as a detector, and the AOTF was used as a wavelength selector. Unlike a tunable grating or prism-based monochromator, an AOTF has no moving parts, and an AOTF can be rapidly tuned to any wavelength in its operating range within microseconds. The large aperture of the AOTF allows the optical signal from over 100 fiber-optic sensors to be measured simultaneously. These characteristics, combined with their small size, make AOTFs an important new alternative to conventional monochromators, especially for spectral multisensing and imaging. A prototype fiber-optic multisensor system has been developed, and its feasibility for simultaneous detection of molecular luminescence signal via fiber-optic probes is demonstrated.
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6

Zheng, Tian-xiang, Guang-yue Shen, Zhao-hui Li, E. Wu, Xiu-liang Chen, and Guang Wu. "Single-photon imaging system with a fiber optic taper." Optoelectronics Letters 14, no. 4 (July 2018): 267–70. http://dx.doi.org/10.1007/s11801-018-8024-y.

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7

Fedotov, M. Yu, O. N. Budadin, and S. O. Kozelskaya. "THE DEVELOPMENT OF OPTICAL TESTING TECHNOLOGY OF PCM STRUCTURES BY FIBER-OPTIC SENSORS." Kontrol'. Diagnostika, no. 256 (2019): 26–35. http://dx.doi.org/10.14489/td.2019.10.pp.026-035.

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Анотація:
The ways of development of optical control technology of polymer composite materials structures by fiber-optic sensors during production and operation are described and investigated. A mathematical model describing the process of PCM monitoring using fiber optic sensors based on fiber Bragg gratings, clarifying the parameters of a mathematical model by experimentally determining the sensitivity coefficient of fiber optic sensors integrated in PCM, makes it possible to reduce the error in measuring strain by 5 – 7 times. The interaction in the system fiber-optic sensors – PCM and found that the integration of fiber-optic sensors based on quartz fibers in PCM, there is a partial destruction of the protective acrylate shell, which leads to the effect of microslip, which does not significantly affect the quality of measurements and can be compensated for by calibration. The requirements for the placement of fiber-optic sensors in the PCM at the manufacturing stage, including the formation of the input / output zone are formulated. The technology of optical non-destructive testing of composite materials with fiber-optic sensors is described, taking into account the features of the interaction of fiber-optic sensors with composite structures.
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8

Placzek, Fabian, Eliana Cordero Bautista, Simon Kretschmer, Lara M. Wurster, Florian Knorr, Gerardo González-Cerdas, Mikael T. Erkkilä, et al. "Morpho-molecular ex vivo detection and grading of non-muscle-invasive bladder cancer using forward imaging probe based multimodal optical coherence tomography and Raman spectroscopy." Analyst 145, no. 4 (2020): 1445–56. http://dx.doi.org/10.1039/c9an01911a.

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Анотація:
Characterization of bladder biopsies, using a combined fiber optic probe-based optical coherence tomography and Raman spectroscopy imaging system that allows a large field-of-view imaging and detection and grading of cancerous bladder lesions.
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9

Li, Wenxian, Chengshan Han, Congjun Wu, Yawei Huang, and Hang Zhang. "Research on the Coupled Modulation Transfer Function of the Discrete Sampling System with Hexagonal Fiber-Optic Imaging Bundles." Applied Sciences 12, no. 6 (March 18, 2022): 3135. http://dx.doi.org/10.3390/app12063135.

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Анотація:
In this study, we developed a numerical model of the coupled modulation transfer function (coupled-MTF) based on the discrete sampling system from the perspective of optical system imaging quality evaluation for coupled two-dimensional discrete sampling characteristics of the hexagonally aligned fiber-optic imaging bundles and CCD image elements. The results show that when the spatial frequency of the input target signal deviates from the Nyquist frequency by 1%, an increase in the number of fibers leads to a faster convergence of the oscillation of the coupled-MTF, and the coupled-MTF converges to a stable value when the number of fibers reaches 1000 × 1000. The deviation of the spatial frequency of the input target signal from the Nyquist frequency is within 1%, and the oscillatory convergence of the coupled-MTF accelerates with increasing deviation. The coupled-MTF oscillates with the deviation period of the wave peak of the input target signal from the initial position of the fiber center, and the theoretical oscillation spatial period is twice the fiber diameter. This study produces important guidelines for the selection of the number of fibers, input spatial frequency, and initial position deviation of the hexagonally arranged fiber imaging bundles.
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10

Wong, J. W., W. R. Binns, A. Y. Cheng, J. W. Epstein, and J. Klarmann. "A second generation high resolution fiber-optic radiotherapy imaging system." International Journal of Radiation Oncology*Biology*Physics 21 (January 1991): 124. http://dx.doi.org/10.1016/0360-3016(91)90450-i.

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Більше джерел

Дисертації з теми "Non-imaging fiber optic system"

1

Williams, Logan P. "Design and implementation of a fiber optic doppler optical coherence microscopy system for cochlear imaging." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92090.

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Анотація:
Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 63-65).
In this thesis, the design and implementation of a fiber optic Doppler optical coherence microscopy (FO-DOCM) system for cochlear imaging applications is presented. The use of a fiber optic design significantly reduces system size and complexity and the construction of a novel alignment and micropositioning apparatus increases ease of use for the researcher performing the imaging. To enable precise measurements of tissue motion, a time domain DOCM approach is used, utilizing an acousto-optic modulator (AOM) based optical heterodyne system to generate a stationary interference carrier frequency. By referencing this interference signal against the AOM drive signals, measurements of motions with magnitude on the order of 10 pm are shown to be possible. In addition to interferometrically measuring small amplitude motion, the FO-DOCM system is shown to be capable of imaging with a volumetric resolution of 10 x 9 x 9 pm. Demonstrative results of imaging cochlear tissue are presented by using the FO-DOCM system to image and measure motion in a guinea pig cochlea in vitro.
by Logan P. Williams.
M. Eng.
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2

Ducourthial, Guillaume. "Développement d'un endomicroscope multiphotonique compact et flexible pour l'imagerie in vivo haute résolution de tissus biologiques non marqués." Thesis, Limoges, 2014. http://www.theses.fr/2014LIMO0004/document.

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Анотація:
La microscopie multiphotonique est un outil essentiel d’investigation en biologie cellulaire et tissulaire. Son extension à l’endoscopie est l’objet d’intenses efforts de recherche pour des applications en neurosciences (imagerie cérébrale du petit animal) ou en clinique (diagnostic précoce, aide à la biopsie). Ce manuscrit porte sur le développement d’un endomicroscope multiphotonique présentant des performances inédites. Ce dispositif est alimenté par un oscillateur titane-saphir standard. Vient ensuite un module de pré-compensation des distorsions linéaires et non linéaires se produisant dans la fibre endoscopique. Ce module permet d’obtenir des impulsions compressées de 39 fs à la sortie d’une fibre microstructurée air-silice innovante à double gaine de 5 mètres de long qui est optimisée pour l’excitation multiphotonique (cœur central de 3,4 µm à maintien de polarisation) et la collection du signal produit par les cibles biologiques. A l’extrémité de la fibre, on trouve une sonde endoscopique, de 2,2 mm de diamètre pour 37 mm de long, composée d’un micro-scanner à fibre optique et d’un micro-objectif achromatique de distance de travail supérieure à 400 µm. La résolution spatiale de l’appareil vaut 0,83 µm et l’acquisition se fait en simultané sur deux canaux spectraux à 8 images/s. L’appareil a permis l’enregistrement d’images in vivo sans marquage des tubules et de la capsule rénale, respectivement par fluorescence à deux photons des flavines et par génération de second harmonique du collagène, avec 30 mW sur les tissus et jusqu’à 300 µm sous la surface de l’organe
Multiphoton microscopy is an essential investigative tool in cell and tissue biology. Its extension to endoscopy is the subject of intensive research for applications in neuroscience (brain imaging of small animals) or clinical (early diagnosis, help for biopsy). This manuscript focuses on the development of an endomicroscope with multiphoton unprecedented performance. This device is powered by a standard titanium-sapphire oscillator. Then comes a pre-compensation module of linear and nonlinear distortions occurring in the endoscopic fiber. This module provides compressed pulses of 39 fs at the direct output of 5 meters long innovative double-clad air-silica microstructured fiber which is optimized for multiphoton excitation (polarization maintaining central core of 3.4 µm) and the collection of the signal produced by biological targets. At the end of the fiber, there is an endoscopic probe, 2.2 mm in diameter and 37 mm long, composed of a micro fiber scanning system and an achromatic micro-objective with a working distance greater than 400 µm. The spatial resolution of the device is 0.83 µm and the acquisition is done simultaneously on two spectral channels at 8 frames/s. The device has recorded in vivo images without label of the tubules and the renal capsule, respectively by two-photon excitation fluorescence of flavins and second harmonic generation of collagen, with 30 mW on the tissues and 300 µm below the surface of the organ
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3

Fu, Ling, and n/a. "Fibre-optic nonlinear optical microscopy and endoscopy." Swinburne University of Technology, 2007. http://adt.lib.swin.edu.au./public/adt-VSWT20070521.155004.

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Анотація:
Cancer is a major health problem in the world today. Almost all cancers have a significantly better chance for therapy and recovery if detected at their early stage. The capability to perform disease diagnosis at an early stage requires high-resolution imaging that can visualise the physiological and morphological changes at a cellular level. However, resolving powers of current medical imaging systems are limited to sub-millimeter sizes. Furthermore, the majority of cancers are associated with morphological and functional alterations of cells in epithelial tissue, currently assessed by invasive and time-consuming biopsy. Optical imaging enables visualisations of tissue microstructures at the level of histology in non-invasive means. Optical imaging is suitable for detecting neoplastic changes with sub-cellular resolution in vivo without the need for biopsy. Nonlinear optical microscopy based on multi-photon absorption and higher harmonic generation has provided spectacular sights into visualisation of cellular events within live tissue due to advantages of an inherent sectioning ability, the relatively deep optical penetration, and the direct visualisation of intrinsic indicators. Two-photon excited uorescence (TPEF) from intrinsic cell components and second harmonic from asymmetric supermolecular structures can provide complementary information regarding functionalities and morphologies in tissue environments, thus enabling premalignant diagnosis by detecting the very earliest changes in cellular structures. During the past sixteen years, nonlinear optical microscopy has evolved from a photonic novelty to a well-established laboratory tool. At present, in vivo imaging and long-term bedside studies by use of nonlinear optical microscopy have been limited due to the fact that the lack of the compact nonlinear optical instrument/imaging technique forces the performance of nonlinear optical microscopy with bulk optics on the bench top. Rapid developments of fibre-optics components in terms of growing functionalities and decreasing sizes provide enormous opportunities for innovation in nonlinear optical microscopy. Fibre-based nonlinear optical endoscopy will be the soul instrumentation to permit the cellular imaging within hollow tissue tracts or solid organs that are inaccessible with a conventional optical microscope. Lots of efforts have been made for development of miniaturised nonlinear optical microscopy. However, there are major challenges remaining to create a nonlinear optical endoscope applicable within internal cavities of a body. First, an excitation laser beam with an ultrashort pulse width should be delivered eciently to a remote place where ecient collection of faint nonlinear optical signals from biological samples is required. Second, laser-scanning mechanisms adopted in such a miniaturised instrumentation should permit size reduction to a millimeter scale and enable fast scanning rates for monitoring biological processes. Finally, the design of a nonlinear optical endoscope based on micro-optics must maintain great exibility and compact size to be incorporated into endoscopes to image internal organs. Although there are obvious diculties, development of fibre-optic nonlinear optical microscopy/endoscopy would be indispensible to innovate conventional nonlinear optical microscopy, and therefore make a significant impact on medical diagnosis. The work conducted in this thesis demonstrates the new capability of nonlinear optical endoscopy based on a single-mode fibre (SMF) coupler or a double-clad photonic crystal fibre (PCF), a microelectromechanical system (MEMS) mirror, and a gradientindex (GRIN) lens. The feasibility of all-fibre nonlinear optical endoscopy is also demonstrated by the further integration of a double-clad PCF coupler. The thesis concentrates on the following key areas in order to exploit and understand the new imaging modality. It has been known from the previous studies that an SMF coupler is suitable for twoii photon excitation by transmitting near infrared illumination and collecting uorescence at visible wavelength as well. Although second harmonic generation (SHG) wavelength is farther away from the designed wavelength of the fibre coupler than that of normal TPEF, it is demonstrated in this thesis that both SHG and TPEF signals can be collected simultaneously and eciently through an SMF coupler with axial resolution of 1.8 um and 2.1 um, respectively. The fibre coupler shows a unique feature of linear polarisation preservation along the birefringent axis over the near infrared and the visible wavelength regions. Therefore, SHG polarisation anisotropy can be potentially extracted for probing the orientation of structural proteins in tissue. Furthermore, this thesis shows the characterisation of nonlinear optical microscopy based on the separation distance of an SMF coupler and a GRIN lens. Consequently, the collection of nonlinear signals has been optimised after the investigation of the intrinsic trade-off between signal level and axial resolution. These phenomena have been theoretically explored in this thesis through formalisation and numerical analysis of the three-dimensional (3D) coherent transfer function for a SHG microscope based on an SMF coupler. It has been discovered that a fibreoptic SHG microscope exhibits the same spatial frequency passband as that of a fibreoptic reection-mode non-uorescence microscope. When the numerical aperture of the fibre is much larger than the convergent angle of the illumination on the fibre aperture, the performance of fibre-optic SHG microscopy behaves as confocal SHG microscopy. Furthermore, it has been shown in both analysis and experiments that axial resolution in fibre-optic SHG microscopy is dependent on the normalised fibre spot size parameters. For a given illumination wavelength, axial resolution has an improvement of approximately 7% compared with TPEF microscopy using an SMF coupler. Although an SMF enables the delivery of a high quality laser beam and an enhanced sectioning capability, the low numerical aperture and the finite core size of an SMF give rise to a restricted sensitivity of a nonlinear optical microscope system. The key innovation demonstrated in this thesis is a significant signal enhancement of a nonlinear optical endoscope by use of a double-clad PCF. This thesis has characterised properties of our custom-designed double-clad PCF in order to construct a 3D nonlinear optical microscope. It has been shown that both the TPEF and SHG signal levels in a PCF-based system that has an optical sectioning property for 3D imaging can be significantly improved by two orders of magnitude in comparison with those in an SMF-based microscope. Furthermore, in contrast with the system using an SMF, simultaneous optimisations of axial resolution and signal level can be obtained by use of double-clad PCFs. More importantly, using a MEMS mirror as the scanning unit and a GRIN lens to produce a fast scanning focal spot, the concept of nonlinear optical endoscopy based on a double-clad PCF, a MEMS mirror and a GRIN lens has been experimentally demonstrated. The ability of the nonlinear optical endoscope to perform high-resolution 3D imaging in deep tissue has also been shown. A novel three-port double-clad PCF coupler has been developed in this thesis to achieve self-alignment and further replace bulk optics for an all-fibre endoscopic system. The double-clad PCF coupler exhibits the property of splitting the laser power as well as the separation of a near infrared single-mode beam from a visible multimode beam, showing advantages for compact nonlinear optical microscopy that cannot be achieved from an SMF coupler. A compact nonlinear optical microscope based on the doubleclad PCF coupler has been constructed in conjunction with a GRIN lens, demonstrating high-resolution 3D TPEF and SHG images with the axial resolution of approximately 10 m. Such a PCF coupler can be useful not only for a fibre-optic nonlinear optical probe but also for double-clad fibre lasers and amplifiers. The work presented in this thesis has led to the possibility of a new imaging device to complement current non-invasive imaging techniques and optical biopsy for cancer detection if an ultrashort-pulsed fibre laser is integrated and the commercialisation of the system is achieved. This technology will enable in vivo visualisations of functional and morphological changes of tissue at the microscopic level rather than direct observations with a traditional instrument at the macroscopic level. One can anticipate the progress in bre-optic nonlinear optical imaging that will propel imaging applications that require both miniaturisation and great functionality.
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4

Денисов, Микола Олександрович. "Підвищення ефективності незображуючих волоконно- оптичних систем для мінімально інвазивної клінічної медицини". Doctoral thesis, Київ, 2016. https://ela.kpi.ua/handle/123456789/16317.

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Анотація:
Дисертація присвячена вирішенню наукової проблеми підвищення ефективності незображуючих волоконно-оптичних систем (НВОС) для мінімально інвазивної клінічної медицини. Розроблено узагальнені принципи структурно-функціональної організації незображуючих волоконно-оптичних систем для мінімально інвазивної клінічної медицини, в основі яких лежать узагальнені класифікації НВОС та волоконно- оптичного інструменту (ВОІ); оригінальну математичну модель розповсюдження оптичного випромінювання всередині біотанини та математичну модель флуоресцентного сигналу від неї; нові математичні моделі та технічні рішення побудови оригінальних базових функціональних модулів з оцінюванням і оптимізацією їх ефективності за запропонованими кількісними показниками з метою цілеспрямованого створення діагностичних та лікувальних систем і наступним їх впровадженням у виробництво та клінічну практику.
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5

Agarwal, Manu. "Developing a Framework for Selecting Condition Assessment Technologies for Water and Wastewater Pipes." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/34771.

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Анотація:
Beneath North America's roads lie 1.6 million miles of pipeline that provides users with potable water and carry away wastewater. These buried infrastructure systems have been functioning for duration longer than their intended design life, often with little or no repair. Asset management of pipeline systems pose a major challenge for most municipalities due to budgetary constraints, demand for quality service, and need to preserve existing pipeline infrastructure. The first step in developing and implementing a comprehensive asset management plan is to perform a condition assessment. There is a gamut of inspection and monitoring technologies available to enable the condition assessment of pipelines. All of these have advantages and limitations, which determine the performance quality and effectiveness of an individual technology for particular utility assets. Unfortunately, utilities choose technologies not suitable for their specific assets and collect data that is not useful for understanding the condition of their system. The objective of this thesis is to develop a framework for the effective selection of condition assessment technologies for water and wastewater utilities. A Microsoft-Excel based framework is developed to help the utility managers in selecting condition assessment technologies for their water and wastewater pipeline assets. The recommended tool selection approach uses a multi-step exclusion protocol in which the tools are excluded on the basis of their applicability relating to technical feasibility and technical suitability for a particular situation. Usable tools are then compared against a performance and cost database to determine performance and cost in a given project/ utility condition. This thesis provides a brief description and review of 24 non-destructive commercialized condition assessment technologies, including the principal and implementation considerations. A framework for decision system tool was developed to facilitate utilities in selecting appropriate condition assessment technologies. This framework could facilitate the selection of usable technologies by excluding the options which are not technically feasible and suitable. The user can then further explore the usable tools and determine the most suitable technologies for their assets. The data considered in the research is provided by technology providers, thus it may lack complete understanding of the capabilities and limitations of technology. This thesis also presents a case study which highlights the existing gap between the understanding of capabilities and limitations of various technologies. A program is developed as a part of this thesis, Condition Assessment Selection Tool (CAST), which consists of performance and economic database, a graphical user interface to facilitate user input, and the results of the comparison of each usable technology in the database to the project information provided by the user for their assets. The results are presented as performance indices and economic indices indicating the performance and technology cost of usable technologies. A data reliability index was also developed to provide a scale for comparing the reliability of the existing data in the database.
Master of Science
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6

Byers, Daniel James 1958. "Design of a high speed fiber optic network interface for medical image transfer." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276590.

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A high speed, 125 mega-bit per second data rate, data communication channel using fiber optic technology is described. Medical image data, generated by CT scanner or magnetic resonance imaging type imaging equipment, passes from standard American College of Radiology - National Electrical Manufactures Association (ACR-NEMA) interface equipment to the High Speed Fiber Optic Network Interface (HSFONI). The HSFONI implements the ACR-NEMA standard interface physical layer with fiber optics. The HSFONI accepts data from up to 8 devices and passes data to other devices or to a data base archive system for storage and future viewing and analysis. The fiber components, system level, and functional level considerations, and hardware circuit implementation are discussed.
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7

Yang, Yujie. "Confocal Scanning Imaging System for Surface Characterization in Additive Manufacturing System." University of Dayton / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1576066631705912.

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8

Shaklan, Stuart Bruce. "Multiple beam correlation using single-mode fiber optics with application to interferometric imaging." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184827.

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A study of the application of single-mode fiber optics to the multiple-beam interferometric recombination problem is presented. In the laboratory, the fibers have been used in wide bandwidth, two-arm, Mach-Zehnder test interferometers as well as a 5-telescope imaging interferometer connected to an all-fiber beam combiner. Based upon these experiments and some theoretical studies it is shown that fiber optics and fiber optic components such as directional couplers provide an excellent alternative to conventional optics such as mirrors, beamsplitters, and relay lenses. The equations describing the measurement of the complex degree of coherence in an interferometer with a single-mode fiber in each arm are derived. The equations reveal an important feature of the fibers: they filter phase fluctuations due to aberrations and turbulence at the input and convert them to intensity fluctuations at the output. This leads to a simplification of the calibration of measured visibilities. The coupling efficiency of light which has passed through a turbulent atmosphere is also studied as a function of fiber parameters and turbulence conditions for both image motion stabilized and non-stabilized cases. For the former case, coupling efficiency remains greater than 50% as long as telescope diameter is no larger than the turbulence coherence length. Beam combination architectures using arrays of directional couplers are fully discussed. Arrays accommodating up to 20 input beams are presented. The arrays require only N detector pixels for N input beams. A scheme of temporal multiplexing of the phase of each beam is used to identify individual fringe pairs. One possible scheme allows wide bandwidths even for large numbers of beams. A 5-telescope interferometer has been constructed and connected to an all-fiber beam combiner. Two extended objects were observed and reconstructed using standard radio astronomy VLBI software. The interferometer and beam combiner had good thermal and polarization stability and high throughput. Reconstructed images had dynamic ranges of about 50.
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9

Padalkar, Mugdha Vijay. "DEVELOPMENT OF NON-DESTRUCTIVE INFRARED FIBER OPTIC METHOD FOR ASSESSMENT OF LIGAMENT AND TENDON COMPOSITION." Diss., Temple University Libraries, 2016. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/378679.

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Bioengineering
Ph.D.
More than 350,000 anterior cruciate ligament (ACL) injuries occur every year in the United States. A torn ACL is typically replaced with an allograft or autograft tendon (patellar, quadriceps or hamstring), with the choice of tissue generally dictated by surgeon preference. Despite the number of ACL reconstructions performed every year, the process of ligamentization, transformation of a tendon graft to a healthy functional ligament, is poorly understood. Previous research studies have relied on mechanical, biochemical and histological studies. However, these methods are destructive. Clinically, magnetic resonance imaging (MRI) is the most common method of graft evaluation, but it lacks adequate resolution and molecular specificity. There is a need for objective methodology to study the ligament repair process that would ideally be non- or minimally invasive. Development of such a method could lead to a better understanding of the effects of therapeutic interventions and rehabilitation protocols in animal models of ligamentization, and ultimately, in clinical studies. Fourier transform infrared (FT-IR) spectroscopy is a technique sensitive to molecular structure and composition in tissues. FT-IR fiber optic probes combined with arthroscopy could prove to be an important tool where minimally invasive tissue assessment is required, such as assessment of graft composition during the ligamentization process. Spectroscopic methods have been used to differentiate normal and diseased connective tissues, but have not been applied to investigate ligamentization, or to investigate differences in tendons and ligaments. In the proposed studies, we hypothesize that infrared spectroscopy can provide molecular information about the compositional differences between tendons and ligaments, which can serve as a foundation to non-destructively monitor the tissue transformation that occurs during ligamentization.
Temple University--Theses
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10

Nematbakhsh, Mohammed Ali. "Design and performance evaluation of a high-speed fiber optic integrated computer network for imaging communication systems." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184597.

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In recent years, a growing number of diagnostic examinations in a hospital are being generated by digitally formatted imaging modalities. The evolution of these systems has led to the development of a totally digitized imaging system, which is called Picture Archiving and Communication System (PACS). A high speed computer network plays a very important role in the design of a Picture Archiving and Communication System. The computer network must not only offer a high data rate, but also it must be structured to satisfy the PACS requirements efficiently. In this dissertation, a computer network, called PACnet, is proposed for PACS. The PACnet is designed to carry image, voice, image pointing overlay, and intermittent data over a 200 Mbps dual fiber optic ring network. The PACnet provides a data packet channel and image and voice channels based on Time Division Multiple Access (TDMA) technique. The intermittent data is transmitted over a data packet channel using a modified token passing scheme. The voice and image pointing overlay are transferred between two stations in real-time to support the consultive nature of a radiology department using circuit switching techniques. Typical 50 mega-bit images are transmitted over the image channel in less than a second using circuit switching techniques. A technique, called adaptive variable frame size, is developed for PACnet to achieve high network utilization and short response time. This technique allows the data packet traffic to use any residual voice or image traffic momentarily available due to variation in voice traffic or absence of images. To achieve optimal design parameters for network and interfaces, the PACnet is also simulated under different conditions.
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Книги з теми "Non-imaging fiber optic system"

1

Conference, on Optical Fiber Communication (2003 Atlanta Ga ). Optical Fiber Communications Conference (OFC): Postconference digest. Washington, DC: Optical Society of America, 2003.

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2

Handbook of biomedical optics. Boca Raton: CRC Press, 2011.

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3

Conference on Optical Fiber Communication (1997 Dallas, Tex.). Conference on Optical Fiber Communications: Technical digest, February 16-21, 1997, Dallas Conference Center, Dallas, Texas. Washington, DC: Optical Society of America, 1997.

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4

1961-, Hooper Brett Andrew, ed. An introduction to biomedical optics. New York: Taylor & Francis, 2007.

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5

1947-, Wootton John, ed. Electro-optical systems peformance modeling. Boston: Artech House, 1993.

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6

N, Sivarajan Kumar, ed. Optical networks: A practical perspective. 2nd ed. San Francisco: Morgan Kaufmann Publishers, 2002.

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7

Ramaswami, Rajiv. Optical networks: A practical perspective. San Francisco: Morgan Kaufmann Publishers, 1998.

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8

(Editor), L. S. Grattan, and B. T. Meggitt (Editor), eds. Optical Fiber Sensor Technology - Volume 3: Applications and Systems (Optoelectronics, Imaging and Sensing). Springer, 1999.

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9

Yeow, John Tze-Wei. Optical microelectromechanical system development for biomedical imaging and fibre-optic switches. 2003.

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10

Keoghane, Stephen, and Mark Sullivan. The principles of endourology. Edited by John Reynard. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780199659579.003.0032.

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The chapter discusses the principles of endourology outlining the principles behind the sub-specialty. Topics disused include endoscopes, cystoscopes, rigid and semi-rigid ureteroscopes, flexible ureterorenoscopes, rigid and flexible nephroscopes, disposable equipment, integrated operating theatres, narrow band imaging (NBI), theatre ergonomics, and antibiotics. Urologic endoscopes are generally of two optical designs: the rigid, rod lens system described by Hopkins, while fibre-optic imaging bundles are used in both rigid and flexible endoscopes. The rod lens system consists of a series of glass rods with polished ends with the key feature of air gaps that act as a lens. Light is carried efficiently along the rod, resulting in a clear and bright image.
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Частини книг з теми "Non-imaging fiber optic system"

1

Esther Jenifa, S., and K. Gokulakrishnan. "Impacts of Non-linear Effects in DWDM Based Fiber Optic Communication System." In Lecture Notes on Data Engineering and Communications Technologies, 621–29. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-24643-3_74.

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2

Nakanishi, Tomoko M. "Real-Time Element Movement in a Plant." In Novel Plant Imaging and Analysis, 109–68. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4992-6_4.

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AbstractWe developed an imaging method utilizing the available RIs. We developed two types of real-time RI imaging systems (RRIS), one for macroscopic imaging and the other for microscopic imaging. The principle of visualization was the same, converting the radiation to light by a Cs(Tl)I scintillator deposited on a fiber optic plate (FOS). Many nuclides were employed, including 14C, 18F, 22Na, 28Mg, 32P 33P, 35S, 42K, 45Ca, 48V, 54Mn, 55Fe, 59Fe, 65Zn, 86Rb, 109Cd, and 137Cs.Since radiation can penetrate the soil as well as water, the difference between soil culture and water culture was visualized. 137Cs was hardly absorbed by rice roots growing in soil, whereas water culture showed high absorption, which could provide some reassurance after the Fukushima Nuclear Accident and could indicate an important role of soil in firmly adsorbing the radioactive cesium.28Mg and 42K, whose production methods were presented, were applied for RRIS to visualize the absorption image from the roots. In addition to 28Mg and 42K, many nuclides were applied to image absorption in the roots. Each element showed a specific absorption speed and accumulation pattern. The image analysis of the absorption of Mg is presented as an example. Through successive images of the element absorption, phloem flow in the aboveground part of the plant was analyzed. The element absorption was visualized not only in the roots but also in the leaves, a basic study of foliar fertilization.In the case of the microscopic imaging system, a fluorescence microscope was modified to acquire three images at the same time: a light image, fluorescent image, and radiation image. Although the resolution of the image was estimated to be approximately 50 μm, superposition showed the expression site of the transporter gene and the actual 32P-phosphate absorption site to be the same in Arabidopsis roots.
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3

Ellis, Andrew D., and Jian Zhao. "Channel Capacity of Non-Linear Transmission Systems." In Impact of Nonlinearities on Fiber Optic Communications, 507–38. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-8139-4_13.

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4

Verriest, G., Françoise E. Sucs, and A. Uvijls. "Spectral and flicker sensitivity functions with a fibre optic non-Maxwellian view system." In Documenta Ophthalmologica Proceedings Series, 107–10. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3774-4_13.

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5

Pan, Yicheng “Peter”, and Tsuchin “Philip” Chu. "Intelligent Non-Destructive Evaluation Expert System for Carbon Fiber Reinforced Plastics Panel Using Infrared Thermography." In Thermomechanics and Infra-Red Imaging, Volume 7, 91–98. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0207-7_12.

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6

Verriest, G., Françoise E. Sucs, and A. Uvijls. "Spectral and flicker sensitivity functions in retinitis pigmentosa with a fibre optic non-Maxwellian view system." In Documenta Ophthalmologica Proceedings Series, 485–91. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3774-4_57.

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7

Vinogradov, V. Yu, O. G. Morozov, and R. Z. Gibadullin. "Aeroacoustic Cartography as Method of Non-destructive Testing of Turbine Blades Based on Fiber Optic Sensor Systems." In Lecture Notes in Mechanical Engineering, 520–28. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-54817-9_61.

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8

Sadiq, Iqbal, and Tracy Stoudemayer. "Fiber-Optic Microscopy System for Skin Surface Imaging." In Handbook of Non-Invasive Methods and the Skin, Second Edition, 125–34. CRC Press, 2006. http://dx.doi.org/10.3109/9781420003307-21.

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9

Irfan Anis, Muhammad, and Hamdan Ali. "Multi-core Fiber Technology." In Fiber Optics - Technology and Applications. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.100116.

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Traditional single-mode fiber capacity issues will be mitigated by using space-division multiplexing in future 5G, IoT, and M2M networks. Multi-core fibers are expected as a good candidate for overcoming the capacity limit of a current optical communication system. This chapter describes the recent progress on the Multi-core fibers technology for the application of high capacity space-division multiplexing to be utilized for long-distance transmission systems. Further various optical approaches that enable key functions are discussed, including SDM MUX/DeMUX, switches, transceivers to enable next generation optical network. Moreover, issues like crosstalk, non-linearity is a potential limitation on the achievable data-rates in optical fiber transmission systems using multi-core fibers will be discussed.
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10

"Imaging System Using Gradient Index Fibers." In FIBER OPTICS, edited by R. Hsing, 195–232. CRC Press, 2018. http://dx.doi.org/10.1201/9781351072021-8.

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Тези доповідей конференцій з теми "Non-imaging fiber optic system"

1

Faller, Jr., Carlton S., Mark W. Ehrhardt, Stanley E. Monroe, Jr., and Richard D. Juday. "Multiple-input fiber optic imaging system." In Optical Engineering and Photonics in Aerospace Sensing, edited by Edward W. Taylor. SPIE, 1993. http://dx.doi.org/10.1117/12.156577.

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2

Dallas, W. J., K. I. Komatsu, K. M. McNeill, K. Tawara, R. Vercillo, H. Osada, K. Maloney, et al. "A Fiber-Optic Network System for PACS." In 1989 Medical Imaging, edited by Samuel J. Dwyer III, R. Gilbert Jost, and Roger H. Schneider. SPIE, 1989. http://dx.doi.org/10.1117/12.953320.

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3

Varshneya, D., and J. W. Berthold. "Fiber Optic Non-Contact Temperature Probe System." In Cambridge Symposium-Fiber/LASE '86, edited by Ramon P. DePaula and Eric Udd. SPIE, 1987. http://dx.doi.org/10.1117/12.937508.

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4

Yang, Kyoung, Linda P. B. Katehi, and John F. Whitaker. "Fiber-Based Electro-Optic Field Imaging System." In Ultrafast Electronics and Optoelectronics. Washington, D.C.: OSA, 2001. http://dx.doi.org/10.1364/ueo.2001.uwd4.

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5

Ogle, James W., Douglas Thayer, Larry D. Looney, Frank Cverna, George Yates, Charles E. Iverson, Steven S. Lutz, Melvin A. Nelson, and Bruce Whitcomb. "Radiation-Induced Imaging System Over Long Fiber-Optic Bundles." In Cambridge Symposium-Fiber/LASE '86, edited by James S. Chang. SPIE, 1987. http://dx.doi.org/10.1117/12.937608.

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6

Gauthier, Jr., L. R., D. V. Hahn, M. J. Harold, and J. R. Meyer. "Prototype fiber optic imaging system for aerospace applications." In SPIE Defense, Security, and Sensing, edited by Alex A. Kazemi, Bernard C. Kress, and Eric Y. Chan. SPIE, 2010. http://dx.doi.org/10.1117/12.850417.

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7

Berthold III, John W., Stuart E. Reed, and Darlene S. Mosser-Kerner. "Flight test results from Fiber Optic Control System Integration (FOCSI) fiber optic total pressure transducer." In SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, edited by Eric Udd and Deepak Varshneya. SPIE, 1994. http://dx.doi.org/10.1117/12.188852.

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8

Saikaley, Andrew, Igor Pak, Ilya Golub, and Brahim Chebbi. "Imaging with a fiber optic bundle/axicon telescope system." In Photonics North 2010, edited by Henry P. Schriemer and Rafael N. Kleiman. SPIE, 2010. http://dx.doi.org/10.1117/12.872436.

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9

Tecotzky, Raymond H., Todd M. Bazzill, Sandra L. Eldredge, James Tagawa, and James W. Sayre. "Fiber optic video monitoring system for remote CT/MR scanners clinically accepted." In Medical Imaging VI, edited by R. Gilbert Jost. SPIE, 1992. http://dx.doi.org/10.1117/12.60291.

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10

Morgan, Trefor, Yu Rong Zhou, Andrew Lord, and Trevor Anderson. "Non-intrusive Simultaneous Measurement of OSNR, CD and PMD on Live WDM system." In National Fiber Optic Engineers Conference. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/nfoec.2012.ntu2e.4.

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Звіти організацій з теми "Non-imaging fiber optic system"

1

Searcy, Stephen W., and Kalman Peleg. Adaptive Sorting of Fresh Produce. United States Department of Agriculture, August 1993. http://dx.doi.org/10.32747/1993.7568747.bard.

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This project includes two main parts: Development of a “Selective Wavelength Imaging Sensor” and an “Adaptive Classifiery System” for adaptive imaging and sorting of agricultural products respectively. Three different technologies were investigated for building a selectable wavelength imaging sensor: diffraction gratings, tunable filters and linear variable filters. Each technology was analyzed and evaluated as the basis for implementing the adaptive sensor. Acousto optic tunable filters were found to be most suitable for the selective wavelength imaging sensor. Consequently, a selectable wavelength imaging sensor was constructed and tested using the selected technology. The sensor was tested and algorithms for multispectral image acquisition were developed. A high speed inspection system for fresh-market carrots was built and tested. It was shown that a combination of efficient parallel processing of a DSP and a PC based host CPU in conjunction with a hierarchical classification system, yielded an inspection system capable of handling 2 carrots per second with a classification accuracy of more than 90%. The adaptive sorting technique was extensively investigated and conclusively demonstrated to reduce misclassification rates in comparison to conventional non-adaptive sorting. The adaptive classifier algorithm was modeled and reduced to a series of modules that can be added to any existing produce sorting machine. A simulation of the entire process was created in Matlab using a graphical user interface technique to promote the accessibility of the difficult theoretical subjects. Typical Grade classifiers based on k-Nearest Neighbor techniques and linear discriminants were implemented. The sample histogram, estimating the cumulative distribution function (CDF), was chosen as a characterizing feature of prototype populations, whereby the Kolmogorov-Smirnov statistic was employed as a population classifier. Simulations were run on artificial data with two-dimensions, four populations and three classes. A quantitative analysis of the adaptive classifier's dependence on population separation, training set size, and stack length determined optimal values for the different parameters involved. The technique was also applied to a real produce sorting problem, e.g. an automatic machine for sorting dates by machine vision in an Israeli date packinghouse. Extensive simulations were run on actual sorting data of dates collected over a 4 month period. In all cases, the results showed a clear reduction in classification error by using the adaptive technique versus non-adaptive sorting.
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