Дисертації з теми "Non-imaging fiber optic system"
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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.
Повний текст джерелаCataloged 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.
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.
Повний текст джерелаMultiphoton 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
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.
Повний текст джерелаДенисов, Микола Олександрович. "Підвищення ефективності незображуючих волоконно- оптичних систем для мінімально інвазивної клінічної медицини". Doctoral thesis, Київ, 2016. https://ela.kpi.ua/handle/123456789/16317.
Повний текст джерелаAgarwal, Manu. "Developing a Framework for Selecting Condition Assessment Technologies for Water and Wastewater Pipes." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/34771.
Повний текст джерелаMaster of Science
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.
Повний текст джерелаYang, 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.
Повний текст джерелаShaklan, 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.
Повний текст джерелаPadalkar, 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.
Повний текст джерелаPh.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
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.
Повний текст джерелаLindsey, Michael Karel 1963. "Design and simulation of a network interface unit for a fiber optic PACS network using VHDL." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277207.
Повний текст джерелаToenger, Shanti. "Linear and Nonlinear Rogue Waves in Optical Systems." Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2029/document.
Повний текст джерелаThis thesis describes the study of several different classes of linear and nonlinear effects in optics that generatelarge amplitude extreme events with properties analogous to the destructive “rogue waves” on the surface of theocean. The thesis begins with a brief overview of the analogous physics of wave localisation in hydrodynamicand optical systems, where we describe linear and nonlinear rogue wave generating mechanisms in bothcases. We then present numerical and experimental results for rogue wave generation in a linear opticalsystem consisting of free space propagation of a spatial optical field with random phase. Computed statisticsbetween experiment and modelling are in good agreement, and we interpret the results obtained in termsof the properties of localised optical caustics. We then consider rogue waves in the nonlinear system ofmodulation instability described by the Nonlinear Schrodinger Equation (NLSE), and a detailed numericalstudy is presented comparing the spatio-temporal characteristics of localised structures seen from numericalsimulations with different known analytic solutions to the NLSE. Two experimental studies of modulationinstability are then reported. In the first, we present experimental results studying the properties of modulationinstability using a time-lens magnifier system; in the second, we report experimental results studying thefrequency-domain properties of modulation instability using real-time spectral measurements. The latter studyexamines the effect of a weak seed field on spectral bandwidth and stability. All experimental results arecompared with the NLSE simulations and discussed in terms of the qualitative properties of modulationinstability, in order to gain new insights into the complex dynamics associated with nonlinear pulse propagation.In all of these studies, different statistical properties are analised in relation to the emergence of rogue waves
Slim, Joseph. "Optical signal processing for space division multiplexed systems." Thesis, Rennes 1, 2021. http://www.theses.fr/2021REN1S004.
Повний текст джерелаWhile the main advantage of optical communications is to enable transmission of ultra-high capacities by multiplexing dozens of wavelength channels operating at high bit rates, the processing of the data, for instance in view of its regeneration or routing, needs to be performed in the electrical domain, thus requiring optical-to-electrical-to-optical conversions. However, some processing functionalities could be performed more efficiently directly in the optical domain, which is known as all-optical signal processing. As new techniques exploiting the spatial dimension in multimode fibers have been proposed in order to further increase the transmitted capacity, a better understanding of nonlinear effects associated with multimode interactions is desirable. This thesis aimed to explore paths for all-optical signal processing in modedivision multiplexing. In particular, the target was to demonstrate how nonlinear effects in multimode fibers could be used to manipulate the properties of optical signals, either in a mode independent way, or mode dependent way. Two types of fibers were designed. The first one allows to perform some all-optical signal processing functionalities for all the modes of the fiber individually and simultaneously, by using the intramodal fourwave mixing nonlinear effect. The second fiber was designed in a way to perform all-optical signal processing between different modes of the fiber, using intermodal four-wave mixing
Amiot, Caroline. "Nouvelles techniques de detection et d'imagerie avec des sources supercontinuum dans l'infra-rouge." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCD043.
Повний текст джерелаThe ability to detect substances or molecules with high sensitivity and to image objects with high resolution plays an important role in our everyday life as well as in advances in understanding fundamental phenomena. Optical techniques are generally highly beneficial for this purpose as they are intrinsically remote, non-invasive and exhibit superior sensitivity and resolution. In this context, it is thus not surprising that a wide range of sensing and imaging techniques have been developed in the past decades and are continuously the subject intense research. The performance of these methods depends dramatically on the type of light source that is used and it is therefore essential to tailor the light source properties to the intended method of application.A spectral region which has recently attracted a wide interest is the mid-infrared corresponding to the molecular fingerprint region and the atmospheric transparency window. This in turn has triggered renewed research effort into adapting existing technique to this particular region of the electromagnetic spectrum including the light sources and detection schemes. This thesis reports novel, proof-of-concept, broadband optical sensing and imaging techniques in the infrared using supercontinuum light, a class of light sources with unique properties. The techniques are experimentally demonstrated and their performances discussed.Specifically, the thesis demonstrate incoherent broadband cavity enhanced absorp- tion spectroscopy in the mid-infrared wavelength range from 3000 to 3450 nm. Multi-component gas detection with sub-ppm accuracy is achieved in this range, which constitutes the widest continuous detection range for this technique in the mid-infrared.Cantilever-enhanced photoacoustic spectroscopy in the mid-infrared is also demonstrated for the first time in this thesis. The approach is broadband and allows for higher photoacoustic signal intensity and enhanced signal-to-noise ratio as compared to conventional systems that use back-body radiation sources. These results offer novel perspective for photoacoustic detection opening the door to sensitive broadband and compact analysers in the mid-infrared spectral region.Exploiting the shot-to-shot fluctuations of an incoherent supercontinuum and the recent progress in ultrafast real-time spectral measurement techniques, the thesis finally reports on a novel proof-of-concept correlation sensing and imaging method in the form of spectral-domain ghost imaging. The method is fast, scan-free, and offer new opportunities for remote sensing in scattering and absorbing media, or in spectral regions where sensitive detectors are lacking. Application of this technique to broadband spectroscopic measurements gases as well as for interferometric imaging of physical objects is demonstrated. One can legitimately expect that the work presented in this thesis will foster new ideas and developments for optical sensing and imaging
Frisquet, Benoit. "Ondes scélérates complexes dans les fibres optiques." Thesis, Dijon, 2016. http://www.theses.fr/2016DIJOS056/document.
Повний текст джерелаThis manuscript presents the generation of complex rogue waves related to nonlinear instabilities occurring through the propagation of light in standard optical fibers. Linear and nonlinear physical phenomena involved are first listed, in particular some of them by analogy with the field of hydrodynamics. The different forms of rogue waves induced by the modulation instability process are then presented. They are also known as "breathers", and they are obtained by solving the nonlinear Schrödinger equation. From these exact solutions, various experimental systems were designed by means of numerical simulations based on two rogue-wave excitation methods. The first one is an exact generation of mathematical solutions based on the spectral shaping of an optical frequency comb. The second method uses approximate initial conditions with a simple sinusoidal modulation of continuous waves. For both cases, experimental measurements demonstrate the generation of complex rogue waves (i.e., higher-order solutions of the system) arising from the nonlinear superposition or collision of first-order breathers. Finally, we also studied a nonlinear fiber system equivalent to the Manakov model, which involves the propagation of two distinct waves with orthogonal polarizations. The stability analysis and numerical simulations of this multi-component system highlight a novel regime of vector modulation instability and the existence of coupled dark rogue-wave solutions. A new experimental system setup was conceived and theoretical predictions are confirmed with an excellent quantitative agreement
Chaing, Min-Yu, and 江旻育. "Laser speckle imaging system by using optic fiber bundle." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/6ph7e3.
Повний текст джерела國立陽明大學
生醫光電研究所
105
Laser Speckle Contrast Imaging (LSCI) is one of the optical technologies that can visualize blood flow in the imaging field. Simple optical setup and free of contrast agents have made LSCI a popular tool for many studies ,such as vascular structure and hemodynamics. Starting from the Free Space, this thesis verified the relationship between the flow rate and laser speckle contrast, step by step, and the optimal exposure time parameter in the hardware architecture using phantom. Then we verified the “Relative Temporal Minimum Reflectance” and the relationship between the exposure time and the flow rate. Finally, animal experiments were used to verify the parameters in phantom study are appropriate or not. After that, the use of an optical fiber structure was proposed, which can make the laser speckle contrast imaging into a simple system, and not limited to measure the small animal using anesthesia, and ultimately can be applied to monitor the hemodynamics neural in awake, moving animals. At present, we can not obtain an optimized image in the Fiber Bundle System. The mesh pattern of the fiber bundle itself will affect the calculation of the laser contrast. Finally, we refer to the method Cell erasure, but still can not get the best image. We speculate that the single fiber in the fiber bundle may be too thick or the number of effective fibers in the fiber is not enough.
Liu, Shao-Heng, and 劉卲姮. "Development of Photoacoustic Imaging System with a Fiber Optic Guided Laser Generation." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9pxm7d.
Повний текст джерела國立臺北科技大學
製造科技研究所
106
This study demonstrate a imaging method by using fiber to achieve fiberize photoacoustic imaging (PAI). The imaging system primarily consists of a 532 nm fiber laser source with a high pulse repetition rate of up to 600kHz combined with a dual-axis galvanometer mirror. A laser beam is reflected by a beam splitter onto a high speed photodiode to generate trigger signals for a data acquisition card (PXI-5152, National Instruments) and another side is reflected to dual-axis galvanometer mirror to do scanning. For the confocal and coaxial ability of the optical excitation and ultrasonic detection, we use laser through fiber to generate and the Confocal Photoacoustic Transducer (CPT) to detect. Laser radiate in the fiber with the theory of total reflection. The incident is greater than the critical angle, only the incident angle in some range the laser can coupler to the fiber totally. The CPT manufacturing is cooperated with Japanese Professor Tanabe, they help us made the CPT and we do the experiment. Further, a PZT piezoelectric film is coated on a customized stainless steel substrate is applied in photoacoustic imaging. This CPT has a good axial and lateral resolution because of the outstanding focus ability. With the OR-PAM system, the image of copper wire with diameter 100μm and the vessel with width 100μm in the chicken testicle and chicken heart are successfully reconstructed in a 1x1mm2 field of view (FOV).
(7392908), Vaishnavi Anand Radkar. "Characterization and Application of a Lens System Design for Engine Diagnostics and 3D Reconstructions." Thesis, 2019.
Знайти повний текст джерелаA previously designed lens system is constructed and characterized for possible application to engine diagnostics and 3D reconstructions of combusting flows. Since optical engines cannot be operated at the same conditions as a production engine, optical access to a production engine, with minimum changes in the engine geometry is necessary for developing a better understanding of the in-cylinder processes. The application of a probe designed to fit in the pressure transducer port of a diesel engine was demonstrated in this work. Measurement of various optical parameters established the ability of the lens system to have a good resolution over the entire stroke length of the cylinder. The temperature analysis of the probe and lens system confirmed its ability to withstand the high-temperature conditions in the engine cylinder head. The lens system design was coupled with imaging fibers to transmit images from the image plane of the probe to a high-speed camera located at a safe distance from the combusting environment. Due to the robust design of the probe and its compatibility with an imaging fiber, the probe was identified to be a good alternative as an inexpensive lens system for tomography in challenging environments. To validate its use, 3D reconstruction of a sewing pin using a range of views was demonstrated. Parameters affecting the reconstructions were identified and optimized to obtain high-quality reconstructions.
"Non-invasive Choroidal Imaging And Retinal, Choroidal And Optic Nerve Head Oxygen Saturation Calculations Using A Multispectral Snapshot Imaging System With Visible And Near Infrared Wavelengths." Tulane University, 2014.
Знайти повний текст джерелаacase@tulane.edu
Kocincová, Anna S. [Verfasser]. "New pH sensitive sensor materials : luminescent fiber-optic dual sensors for non-invasive and simultaneous measurement of pH and pO2 (dissolved oxygen) in biological systems / vorgelegt von Anna S. Kocincová (geb. Vasylevska)." 2007. http://d-nb.info/985664630/34.
Повний текст джерела(8713962), James Ulcickas. "LIGHT AND CHEMISTRY AT THE INTERFACE OF THEORY AND EXPERIMENT." Thesis, 2020.
Знайти повний текст джерела