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 46 for “"Fiber Bragg Grating"”.
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Strain sensor using fiber bragg grating interrogation
… analyzing a novel design of strain sensor using Fiber Bragg Grating (FBG) interrogation. Studies on fiber optic sensors reported have mainly focused on FBG wavelength-based monitoring method by using optical spectrum analyzers (OSA). Although FBG has better strain sensitivity measurement, however …
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Chloride Selective Gold Coated Fiber Bragg Grating Sensor
… aims at a chloride-sensitive gold-plated Fiber Bragg Grating (FBG) sensor that can detect chloride with good resolution. This sensor is designed for applications in water treatment plants and swimming pools where safety and quality matter. And for better results, we use Atomic Layer …
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Optical fiber temperature sensor based on fiber bragg grating
It is important to study optical fiber temperature sensor based on fiber Bragg Grating. The Fiber Bragg grating sensors can offer highly sensitive, cost effective solutions for optical sensing. While fiber Bragg gratings have been implemented in various sensing applications over the past few …
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Development and optimization of fiber bragg grating sensors in geophysical monitoring.
L'abstract è presente nell'allegato / the abstract is in the attachment
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All-optical ultrafast switches based on thin film coated-tilted fiber Bragg grating
… networks. Switches based on tilted fiber Bragg gratings (TFBG), coupling the forward propagation core mode to hundreds of discrete backward propagation cladding modes provide a novel platform for light-matter interaction by modulation of material permittivity via the evanescent field …
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Enhancement of Ultrasonic Lamb Wave Transfer to Fiber Bragg Grating Sensors through Remote Bonding.
North Carolina State University Theses Mechanical and Aerospace Engineering.
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Fiber Bragg Grating-Based Sensors: Advanced Techniques in Coating and Interrogation for Biomedical Applications
L'abstract è presente nell'allegato / the abstract is in the attachment
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Structural Monitoring With Fiber Bragg Grating Strain Sensor Array and Optical Frequency Domain Reflectometry
… Domain Reflectometry (C-OFDR) to interrogate Fiber Bragg Grating Arrays (FBGA) have shown promise in its use in infrastructure health monitoring systems. In this work, the modeling, design, simulation, fabrication, calibration, and testing of a three-element, 15.3 cm fiber Bragg grating strain …
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Damage Monitoring in Composite Structures through High Speed, Full-spectral Interrogation of Fiber Bragg Grating Sensors.
North Carolina State University Theses Mechanical and Aerospace Engineering.
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Monitoring of Overhead Polymer Core Composite Conductors Under Excessive Mechanical Loads Using Fiber Bragg Grating Sensors
… and tension loading. Furthermore, the use of Fiber Bragg Grating (FBG) sensors was investigated for the first time to monitor the ACCC® design during installation and in-service.</p> <p>Transverse low-velocity impacts to the ACCC® conductor having either free or constrained end conditions and …
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Damage Assessment of an Integrally Stiffened Composite Panel through Dynamic Interrogation of Multiplexed Fiber Bragg Grating Sensors.
North Carolina State University Theses Mechanical and Aerospace Engineering.
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Compensação de temperatura para sensores de corrente elétrica baseados em redes de Bragg em fibras ópticas
… for electrical current sensors based on fiber Bragg gratings using the twin gratings technique. The measurement of electric current by opto-mechanical sensors is very well described in the literature, as well as techniques that propose the compensation of thermal variation effects on the …
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Optical Temperature Monitoring of Electrical Power Transformer Networks
… multiple substations from one central location. Fiber Bragg Grating (FBG) has been used as the optical sensing element for transformer temperature monitoring. Suitable FBG parameters and specifications have been investigated and modeled that fit best for this application. Optical sensor network …
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Fiber Optic Sensing of Strain and Temperature for Structures in a Hypersonic Flow
Research into multi-sensor fiber Bragg grating (FBG) networks has the potential to benefit aircrafthealth monitoring systems. The overall goal of this thesis research is to demonstrate that FBG sensors can be used to measure temperature and strain data of a structure in a hypersonic flow. To that …
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Fully Distributed Multi-parameter Sensors Based on Acoustic Fiber Bragg Gratings
… based on intrinsic scatterings in optical fibers. They demonstrate long sensing span, but their limited applicable parameters (temperature and strain) and costly interrogation systems have prevented their widespread applications. A novel concept of acoustic fiber Bragg grating (AFBG) is …
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Methodology for innovative health monitoring of aerospace structures using dynamic response measurements and advanced signal processing techniques
… exhaustive way the structural state condition. Fiber Bragg Grating (FBG) optical sensors will be used for the recording of dynamic strain measurements from a composite structure. The methodology that will be developed for structural damage detection will use the collected dynamic response data …
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Sensores de fibra óptica tipo redes de Bragg embebidos en material compuesto para medir deformaciones y temperaturas criogénicas
… posibilitar la implementación de los sensores de Bragg en estructuras operativas en el ámbito de la ingeniería aerospacial y dar unos primeros pasos hacia su certificación para el vuelo. Para conseguir dicho objetivo, se han diseñado y realizado múltiples ensayos mecánicos con el fin de estudiar …
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Development of Fiber Optic Sensors using Femtosecond Laser for Refractive Index and Temperature Measurements
The development and transition of optical fiber sensors from experimental stage to practical applications largely depends on manufacturing cost and simplicity. To date, in-fiber grating sensors are largely manufactured by ultraviolet lasers despite higher fabrication cost and complexity. Besides, …
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Detecção de barras quebradas em motores de indução utilizando sensor magnetostrictivo composto aplicado em redes de Bragg em fibras ópticas
… occurs. In this work, a magnetic sensor based on fiber Bragg grating (FBG) and magnetostrictive composite made of Terfenol-D particulates immersed in epoxy resin matrix applied to induction motor is shown to be capable of detecting rotor broken bars in high voltage induction motors, even when the …
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Acoustic Waveguides and Sensors for High Temperature and Gamma Radiation Environment
… sensing systems are reported, such as optical fiber sensors and acoustic sensors, they all have drawbacks. In this dissertation, fused quartz and sapphire acoustic waveguides and sensors are developed for high temperature and heavy gamma radiation. The periodic structure, acoustic fiber Bragg …
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