Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 374 for “"Optical fiber"”.
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Self Similar Optical Fiber
<p>This research proposes Self Similar optical fiber (SSF) as a new type of optical fiber. It has a special core that consists of self similar structure. Such a structure is obtained by following the formula for generating iterated function systems (IFS) in Fractal Theory. The resulted SSF can be …
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Sapphire optical fiber sensors
Fiber optic sensors offer many advantages over conventional sensors, including; small size, low weight, high strength and durability. Standard silica optical fibers are limited by the material properties of silica. Temperatures above 700°C and other harsh environments are incompatible with standard …
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Innovative Plastic Optical Fiber Sensors
… thesis describes the development of new types of fiber optic sensors for the measurement of mechanical quantities such as displacement, vibration and acceleration. Also, it describes the realization of specific acquisition systems designed to interrogate the developed sensors. Since optical fibers …
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In-line optical fiber holography
… holograms in the cladding region of an optical fiber. The cladding is first stripped and replaced with dichromated gelatin ( DCG ) which is a highly efficient holographic storage medium. The evanescent field of the fiber is used as the reference beam to form an interference pattern with …
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Optical Fiber Tip Pressure Sensor
… operate under high temperatures, a novel type of optical fiber tip sensor only 125μm in diameter is presented in this thesis. The essential element is a piece of hollow fiber which connects the fiber end and a diaphragm to form a Fabry-Pérot cavity. The all-fused-silica structure fabricated …
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Concentric-core optical fiber sensors
… strain sensor which uses concentric core optical fiber waveguide as the sensing element. When this particular type of fiber is strained, a transfer of optical power occurs between propagating modes in the two concentric cylindrical cores of the fiber. This strain-induced redistribution of …
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Novel phase-modulated optical fiber sensors
Optical fiber systems have been developed during the past twenty-five years with primary applications in long distance, high speed digital information communication. Optical fiber sensors have also been developed over the past fifteen years for the nondestructive inspection and evaluation of …
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Optical fiber-based corrosion sensor systems
An investigation into optical fiber sensing methods for monitoring metallic corrosion 1s presented. A series of sensing techniques are presented and explored, and two techniques are identified as possible candidates for a corrosion sensing system. The first is a technique based on the phenomenon of …
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Increased Functionality Porous Optical Fiber Structures
A novel fiber optic structure, termed stochastic ordered hole fibers, has been developed that contains an ordered array of six hollow tubes surrounding a hollow core, combined with a nanoporous glass creating a unique fully three dimensional pore/fiber configuration. The objective of this study is …
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Construction of an optical fiber strian gauge
… project is focused on the construction of an optical fiber strain gauge that is based on a strain gauge described by Butter and Hocker. Our gauge is designed to generate an interference pattern from the signals carried on two bare single-mode fibers that are fastened to an aluminum cantilever. …
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Detailed study of Er:YAG-derived optical fiber
… a characterization of four Er:YAG-derived fibers with similar geometries and increasing erbium concentrations. Fibers were fabricated from bulk Er:YAG glass rods with 1%, 2%, 4%, and 5% erbium weight percentages using MCM. Fiber segments from these draw with 10 μm core diameters and …
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Bending loss of polarization maintaining optical fiber
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Optical fiber sensors for advanced civil structures
… is to develop, analyze, and implement optical fiber-based sensors for the nondestructive quantitative evaluation of advanced civil structures. Based on a comparative evaluation of optical fiber sensors that may be used to obtain quantitative information related to physical perturbations …
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Material process monitoring with optical fiber sensors
… of an effort to design a multi-functional fiber optic sensor which can be embedded in polymeric composite laminates for monitoring the degree of cure during its fabrication, as well as internal composite strains occurring post-cure.3 In short, this dual-purpose sensor combines the …
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Localized wave solutions in optical fiber wavelengths
… we demonstrate the existence of LW solutions in optical fiber waveguides operated in the linear regime. In this sense, these solutions are fundamentally different from the non-linear, soliton-based communication systems. Despite the dielectric waveguiding constraints introduced by the fiber, …
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Improved draw process in optical fiber fabrication
The performance of an optical fiber depends to a great extent on the conditions of the process being used to draw the fiber from a glass preform. To get fibers with higher strength and lower transmission loss, the parameters of the draw process must be optimized and the geometric uniformity of the …
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Rare earth-based active optical fiber device development
… analysis, and development of rare-earth-based optical fiber active devices. The properties of the neodymium ion are analyzed and related to its potential role in the operation of various active optical devices. Existing technology in rare-earth-based fiber amplifiers is reviewed. Novel …
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Axial strain effects on optical fiber mode patterns
Axial strain effects in multimode fibers are studied. A few-mode fiber is mounted on a tensile testing machine and strained at various speeds. The output of a monochromatic light source passing through it is monitored and recorded. Relations are noted between the light output the magnitude of …
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Analysis of Side-Polished Few-Mode Optical Fiber
Side-polished fiber allows access to the evanescent field propagating in the cladding of a few-mode fiber. This cladding mode is analyzed and experimentally validated to further the design of a novel class of fiber optic devices. To do this, specific modes are excited in the polished fiber using a …
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Weighted sensitivity optical fiber sensors: theory and applications
… of conventional dual mode, elliptical-core, optical fiber sensors is investigated. To compliment the experimental results, a novel linearly polarized modal analysis of elliptical-core geometries is performed. The method numerically finds solutions of a waveguide equation described by Mathieu …
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