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 96 for “"bragg grating"”.
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Bragg grating filters for optical networks
This thesis focuses on the exploitation of fibre Bragg gratings in optical communication networks. New designs, as well as procedures for dynamically altering grating characteristics are proposed for several important functions. We begin with designing gratings for flattening the gain profile of an …
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Strain sensor using fiber bragg grating interrogation
… 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 there …
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Optofluidic Bragg grating sensors for chemical detection
… and potential applications of direct UV written Bragg grating refractometers for detection of chemical analytes. The technique of direct UV writing uses the localised refractive index increase of a photosensitive planar glass layer upon exposure to a tightly focussed UV beam to fabricate a wide …
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Resonant cavity Fibre Bragg grating sensor interrogation
… to time-division-multiplexing (TDM) fibre Bragg grating (FBG) optical sensors, known as the resonant cavity architecture. A background theory of FBG optical sensing includes several techniques for multiplexing sensors. The limitations of current wavelength-division-multiplexing (WDM) …
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Advanced fibre Bragg grating structures: design and application
… work on a variety of advanced fibre Bragg grating structures covering long dispersion compensating chirped Bragg gratings, superstructured Bragg gratings for identical multiple channel operation, Bragg gratings for pulse-shaping applications and Bragg gratings for add-drop …
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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 Deposition …
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Advanced Fibre Bragg Grating fabrication systems and devices
This thesis address the creation of fibre Bragg grating based sensors and the fabrication systems which are used to manufacture them. The information is presented primarily with experimental evidence, backed up with the current theoretical concepts. The issues involved in fabricating high quality …
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Optical fiber temperature sensor based on fiber bragg grating
… 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 decades, recent efforts …
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Low-cost interrogation of optical fibre Bragg grating sensors
… compare different algorithms for resolving the Bragg wavelength from a low resolution discrete representation of the reflected spectrum, and present optimal processing methods for providing a high integrity measurement from the reflection image. Our second sensing scheme uses a novel network of …
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Fibre Bragg grating temperature sensors for high-speed machining applications
… performance. The optical sensors are fibre Bragg grating based and the optical techniques used to interrogate that sensor include DWDM, WDM, athermic grating, tuneable grating and coupler. Optical fibre devices are simpler to place in situ prior to the machining tests and they offer faster …
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Design, fabrication and measurement of integrated Bragg grating optical filters
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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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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Bragg grating sensor interrogation using in-line, dual-mode fiber demodulators
Optical fiber Bragg gratings, first demonstrated by Hill in 1978 [1], will see increasing deployment as sensors in smart structure applications due to their minimal insertion loss and small profile. Bragg grating sensors provide narrowband reflections from a periodic index discontinuity. Strain and …
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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 of …
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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
… 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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Gamma irradiation response of photonic crystal and standard optical fibre Bragg grating sensors for radiation dosimetry
This study investigates the use of Optical Fibre Bragg Grating Sensors (FBGs) for Gamma Radiation Dosimetry. A comparative analysis of responses to gamma irradiation between standard commercial FBGs and new generation FBGs written in Photonic Crystal fibre (PCF) were examined under similar regimes …
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Monitoring of Overhead Polymer Core Composite Conductors Under Excessive Mechanical Loads Using Fiber Bragg Grating Sensors
… 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 large …
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Fibre bragg gratings for microwave photonics and sensing
… of microwave transversal filters using fibre Bragg grating arrays and the building of fibre Bragg grating based magnetic-field sensors. Some theoretical background about fibre Bragg gratings, photosensitivity, fibre Bragg grating sensors and filters are presented. Fibre Bragg grating sensors …
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