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 22 for “"fiber sensing"”.
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Novel Uses of Distributed Optical Fiber Sensing for Geo-Mechanical Monitoring
… due to high costs. Distributed Optical Fiber Sensing (DOFS) is a powerful technology with advantages like long sensor length, real-time measurement capabilities, ease of installation, low cost, and distributed measurement. However, its application in rock mass monitoring is limited, …
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High-Speed Quasi-Distributed Optical Fiber Sensing Based on Ultra-Weak Fiber Bragg Gratings
Invention of silica based optical fiber not only led to revolution in communication but also provided fundamental basis for many research areas. One example area is distributed optical fiber sensing, which has been attracting research interests for decades. Optical fiber sensors are immune to …
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Remote optical fiber sensing based on reflectance due to the swelling of polymer particles produced by dispersion polymerization
… and used for remote measurements employing fiber optic sensors. The refractive index of poly(4-vinyl pyridine) particles is higher than the refractive index of the hydrogel. At low pH, protonation of the poly(vinyl pyridine) causes the particles to swell reducing their refractive index and …
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Real-Time Signal Processing and Hardware Development for a Wavelength Modulated Optical Fiber Sensor System
The use of optical fiber sensors is increasing widely in civil, industrial, and military applications mainly due to their, (a) miniature size, (b) high sensitivity, (c) immunity from electro-magnetic interference, (d) resistance to harsh environments, (e) remote signal processing ability, and, (f) …
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Sapphire Fiber Based Sensing Technologies for High Temperature Applications
Sapphire fiber has been studied intensively for harsh environment sensing in the past two decades due to its supreme mechanical, physical and optical properties. It is by far the most reported and likely the best optical fiber based sensing technology for sensing applications in temperature beyond …
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Weighted sensitivity optical fiber sensors: theory and applications
… 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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Micro-optical fiber devices used with modal domain sensing
In order to develop more compact optical fiber sensing systems, modal filtering can be performed in-line by using micro-optical devices. Two such devices are a laterally offset few-moded optical fiber mechanical splice and a modal conversion optical fiber coupler. A third device, the air-gap splice …
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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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Multiplexing of Extrinsic Fabry-Perot Optical Fiber Sensors for Strain Measurements
… Conventional sensors are becoming obsolete in sensing for today's multistory buildings because they don't monitor the structural health of the guide rails. This sensing task falls into the fiber sensing niche market because of a fiber sensor's ability to be multiplexed. Previous work by Taplin …
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Sapphire optical fibers: splicing and sensing applications
Fiber optic sensors fabricated from standard silica fibers have many advantages over conventional sensors like small size, portability, durability and immunity to electromagnetic fields. Unfortunately, these sensors are not suitable for use in harsh environments where the temperatures are greater …
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Distributed Pressure and Temperature Sensing Based on Stimulated Brillouin Scattering
… an effective mechanism in temperature and strain sensing. This kind of sensors can be applied to civil structural monitoring of pipelines, railroads, and other industries for disaster prevention. This thesis first presents a novel fiber sensing scheme for long-span fully-distributed pressure …
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Plasmonic Nanoplatforms and Surface-enhanced Raman Spectroscopy for in vivo Sensing: from Plants to Animals
… nanoplatforms developed in our laboratory for sensing applications. Plasmonic nanomaterials, such as gold nanostars (AuNS) a hallmark particle pioneered by the Vo-Dinh group, increase inherently weak Raman signals from molecules providing an intense and unique SERS spectrum allowing for targets …
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High-Temperature Displacement Sensor Using a White-Light Scanning Fiber Michelson Interferometer
… However, currently available sapphire fiber possesses poor optical quality and is not available with a cladding. It has found use in a variety of temperature sensors, but the investigation of sapphire-based strain and displacement sensors has been limited. The primary development of a …
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Advanced Computing and Sensing to Improve Mine Fire Characterization and Response
… research presents the applicability of optical fiber sensing technology for continuous, distributed, and real-time sensing. This new technology could be used for collection of input parameters during ongoing fires, leading to improvement of the prediction performance of the ANNs developed. …
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Experiments and numerical analysis on air bearing slumping of segmented thin-shell mirrors for X-ray telescopes
… tool with improved active control algorithm and fiber sensing techniques, which results in glass with reduced mid-range spatial frequency errors that could be accomplished in much shorter thermal cycles. We examined the influence of the slumping time, the supply pressure and the air film …
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Optical Coherence Sensors in Multimode Fibers
Optical fiber sensors are widely applied in modern sensing systems. Taking advantage of the high sensitivity of optical interference, optical coherence fiber sensors, such as fiber Bragg gratings (FBGs) and Fabry-Perot interferometers (FPIs), have been investigated intensively and utilized broadly …
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Dissolved Gas Analysis of Insulating Transformer Oil Using Optical Fiber
… performed discovering new ways integrate optical fiber sensors into high voltage transformers. This thesis is a continuation of that research by attempting to improve sensor sensitivity for hydrogen and acetylene gasses. Of note is the fabrication of new hydrogen sensing fiber for operation around …
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Digital Optical Performance Monitoring of Coherent Long-Haul and Metropolitan Optical Fiber Links
L'abstract è presente nell'allegato / the abstract is in the attachment
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Fabrication of intensity-based Long-Period-Gratings fiber sensor with CO2 Laser
… for producing long period grating (LPG) fiber sensors with point-by-point irradiation under a CO2 laser beam. The type of fiber sensor under examination is desirable to be highly sensitive to the variation of the thickness and refractive index of a thin film deposited on the LPGs, making …
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Sensing and Communication Coexistence in Optical Networks
L'abstract è presente nell'allegato / the abstract is in the attachment
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