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Dissertations / Theses on the topic 'FBG'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

Li, Kuo. "A novel method of Fiber Bragg Grating (FBG) strain modulation and its application in FBG accelerometers." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/76108/4/Kuo_Li_Thesis.pdf.

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This thesis has systemically investigated the possibility of improving one type of optical fiber sensors by using a novel mechanism. Many parameters of the sensor have been improved, and one outcome of this innovation is that civil structures, such as bridges and high-rise buildings, may be operated more safely and used longer.
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2

Xu, Xingyuan. "Improving the performance of FBG sensing system." Access electronically, 2006. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20070110.144936/index.html.

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3

Sethuraman, Gopakumar. "Fiber Bragg Grating (FBG) Based Chemical Sensor." VCU Scholars Compass, 2008. http://scholarscompass.vcu.edu/etd/1575.

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In this work, reagentless fiber optic-based chemical sensors for water quality testing were fabricated by coating fiber Bragg gratings with the glassy polymer cellulose acetate. With this polymeric matrix capable of localizing or concentrating chemical constituents within its structure, immersion of the coated grating in various chemical solutions causes the rigid polymer to expand and mechanically strain the glass fiber. The corresponding changes in the periodicity of the grating subsequently result in altered Bragg-reflected responses. A high-resolution tunable fiber ring laser interrogator
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4

Abeywickrema, Haburugala Vithanage Ujitha A. "Behavior Of Linearly Polarized (LP) Modes in Fibers Containing Bragg Gratings in the Wide Temperature Range." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1313801169.

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5

Yeo, Jackson Teck Leong. "Application of FBG-based sensors in built environment." Thesis, City University London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440691.

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6

Lopes, Pedro José Ramos. "Aplicação de sensores FBG em modelos para injeção." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/12548.

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Mestrado em Engenharia Mecânica<br>Com o interesse crescente em analisar detalhadamente o comportamento do material fundido no processo de moldação por injeção, procedeu-se à aplicação de sensores de Bragg em fibra ótica (FBG) para medir temperaturas no interior do molde. Ainda hoje é uma incógnita precisar o comportamento do material polimérico no momento da injeção, principalmente a distribuição de temperaturas no perfil da frente de enchimento. Para cumprir o objetivo da dissertação foram gravadas 12 redes de Bragg em 4 fibras óticas distintas com o objetivo de criar uma malha 2D no interi
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7

Jacobsson, Fredrik. "DPSK modulation format for optical communication using FBG demodulator." Thesis, Linköping University, Department of Science and Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2307.

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<p>The task of the project was to evaluate a differential phase shift keying demodulation technique by replacing a Mach-Zehnder interferometer receiver with an optical filter (Fiber Bragg Grating). Computer simulations were made with single optical transmission, multi channel systems and transmission with combined angle/intensity modulated optical signals. The simulations showed good results at both 10 and 40 Gbit/s. Laboratory experiments were made at 10 Gbit/s to verify the simulation results. It was found that the demodulation technique worked, but not with satisfactory experimental results
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8

Deng, Fodan. "Corrosion Risk Assessment System For Coated Pipeline System." Diss., North Dakota State University, 2018. https://hdl.handle.net/10365/31713.

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Steel is widely used as building material for large-scale structures, such as oil and gas pipelines, due to its high strength-to-weight ratio. However, corrosion attack has been long recognized as one of the major reasons of steel pipeline degradation and brings great threat to safety in normal operation of structure. To mitigate the corrosion attacks, coatings are generally applied to protect steel pipelines against corrosion and improve durability of the associated structures for longer service life. Although have higher corrosion resistance, coated pipelines will still get corroded in a lon
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9

Lindley, Emma. "Multicore fibre Bragg gratings for astronomy." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/16682.

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Astrophotonics is the discipline of applying photonic technology in instrumentation to address problems in astronomy and astrophysics. Photonic devices known as fibre Bragg gratings (FBGs) can be used as highly selective filters for removal of unwanted light prior to dispersion in a spectrograph. It has been shown that FBGs are well suited to the problem of removing atmospheric molecular emission lines from ground-based near- infrared observations. This thesis describes the development of a new generation of FBGs for this purpose, inscribed within multi-core fibres (MCFs) which contain multipl
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10

Perazzini, Matteo. "Evaluation of FBG strain sensor reliability through analytical, numerical and experimental results." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/22947/.

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The fiber Bragg grating (FBG) sensor is one of the most suitable sensors for structural health monitoring (SHM) of aircraft structures. In principle, the FBG, with adequate sampling and signal processing techniques, is usually more accurate than classical electrical resistive strain gauge. However, since the most common installation method is surface bonding, some significative differences between the strain in the host structure and the one experienced by the fiber may be observed. The aim of this work is the evaluation of the fiber Bragg grating optical fiber sensor reliability for strain d
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11

Petermann, Ann Britt [Verfasser]. "Optische Sensorsysteme auf Polymerbasis : neuartige FBG- und WGM-Strukturen / Ann Britt Petermann." Hannover : Technische Informationsbibliothek (TIB), 2017. http://d-nb.info/113716400X/34.

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12

Wang, Yujuan. "Instrumentação optoeletrônica em hardware: implementação de algoritmos otimizados em sensoriamento a FBG." Universidade do Estado de Santa Catarina, 2012. http://tede.udesc.br/handle/handle/2073.

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Made available in DSpace on 2016-12-12T20:27:37Z (GMT). No. of bitstreams: 1 Yujuan Wang.pdf: 1608760 bytes, checksum: 9cb82304a2c95c2b0e357dc7f8449815 (MD5) Previous issue date: 2012-12-17<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This work presents the development of an FPGA-based optical interrogation system of multiplexed FBG sensors. The Fabry-Perot filter is used to implement the tunable filter method, as a demodulator for FBG sensors. The tuning signal generation for Fabry-Perot filter and the data aquisition are implemented and syncronized em FPGA. Peak-detect
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13

Zhang, Po. "High-resolution Photon Counting OTDR based Interrogation of Multiplexing Broadband FBG Sensors." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/11064.

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Fiber-optic Bragg grating (FBG) sensors are a very attractive technology for the measurement of strain and temperature. They have many advantages over conventional sensors in sensing applications such as sensitivity, immunity to electromagnetic interferences,large bandwidths,capability of remote operation and the potential power to sense micro strain at high temperature. They can be directly embedded into many structures such as concrete to evaluate the material deformation. FBGs are fabricated by photo-inscribing through a phase mask technology on a photosensitive fiber. A periodic refracti
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14

Triana, Infante Cristian Andrés. "Enoding optial FBG sensors to enhance the capacity of optial sensing systems." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/114824.

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Esta tesis investiga la aplicación de conceptos de codificación al diseño de sensores ópticos basados en redes de difracción de Bragg de Bragg (FBG). Específicamente, se presenta el diseño, la caracterización y la validación experimental de dispositivos de detección codificados personalizados que se pueden diseñar y fabricar como dispositivos FBG súper estructurados (SSFBG). El objetivo de esta tesis es mejorar la capacidad y el rendimiento general de los sistemas de detección óptica basados en sensores FBG convencionales. Para ello, se han propuesto tres metodologías de codificación de dispos
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15

Bond, Justin Matthew. "Status Monitoring Of Inflatables By Accurate Shape Sensing." ScholarWorks @ UVM, 2017. http://scholarworks.uvm.edu/graddis/677.

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The use of inflatable structures in aerospace applications is becoming increasingly widespread. In order to monitor the inflation status and overall health of these inflatables, an accurate means of shape sensing is required. To this end, we investigated two existing methods for measuring simple curvature, or curvature in one-dimension. The first method utilizes a pair of strain sensing Fiber Bragg Gratings (FBGs) separated by a known distance; dividing the difference in strain by the separation distance yields an experimental value for the one-dimensional curvature at a point. The second meth
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16

Yau, Man Hong. "Vertical displacement measurement using fibre Bragg grating (FBG) sensors for structural health monitoring of bridges." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/72911/2/Man_Hong_Yau_Thesis.pdf.

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This thesis developed a practical, cost effective, easy-to-use method for measuring the vertical displacements of bridges using fiber Bragg grating (FBG) sensors, which includes the curvature and inclination approaches. These approaches were validated by the numerical simulation tests on a full scale bridge and the laboratory-based tests. In doing so, a novel frictionless FBG inclination sensor with extremely high sensitivity and resolution has also been developed and validated.
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17

Vargas, German R. "Silicon Photonic Device for Wavelength Sensing and Monitoring." FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/734.

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Over the last decade advances and innovations from Silicon Photonics technology were observed in the telecommunications and computing industries. This technology which employs Silicon as an optical medium, relies on current CMOS micro-electronics fabrication processes to enable medium scale integration of many nano-photonic devices to produce photonic integrated circuitry. However, other fields of research such as optical sensor processing can benefit from silicon photonics technology, specially in sensors where the physical measurement is wavelength encoded. In this research work, we present
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18

Suleiman, Maha. "Conception d'un capteur optoélectronique par interférométrie à rétro-injection optique pour la démodulation des signaux de fibres optiques à réseaux de Bragg." Toulouse, INPT, 2008. http://ethesis.inp-toulouse.fr/archive/00000702/.

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Nous proposons, dans cette thèse, une nouvelle technique de démodulation des variations de la longueur d'onde centrale d'une FBG (Fiber Bragg Grating) qui a pour principe l'interférométrie à rétro-injection optique dans une cavité laser longitudinale monomode (ou « self-mixing interferometry »). Le capteur conçu complet comprend une diode laser avec une photodiode intégrée qui est couplée à une FBG sous contraintes. Une partie de la lumière émise par le laser est réfléchie par la FBG et ensuite rétro-injectée dans la cavité laser, modifiant ainsi les propriétés du laser et engendrant des phéno
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19

Akter, Afroja. "Gap Solitons in a Coupled FBGs with Cubic-quintic Nonlinearity and Dispersive Reflectivity." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/23994.

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This thesis presents a comprehensive analysis of optical gap solitons in linearly coupled fibre Bragg gratings with higher-order nonlinearity, such as cubic-quintic nonlinearity and grating non-uniformity. The non-uniformity is accounted for with a dispersive reflectivity parameter. We find two disjointed families of solitons—named Type 1 and Type 2 gap solitons—in the entire bandgap. The Type 1 family shows the generalised behaviour of Kerr nonlinearity. In contrast, where quintic nonlinearity shows dominant behaviour, we find Type 2 solitons. Moreover, each family presents asymmetric and sym
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20

SANTOS, Adam Dreyton Ferreira dos. "Proposta de gerenciamento de dados para monitoramento de saúde estrutural utilizando redes de sensores ópticos FBG." Universidade Federal do Pará, 2014. http://repositorio.ufpa.br/jspui/handle/2011/5603.

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Submitted by Cleide Dantas (cleidedantas@ufpa.br) on 2014-07-31T13:54:16Z No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Dissertacao_PropostaGerenciamentoDados.pdf: 5547219 bytes, checksum: de79901f4ae801f0d5d68e9d4c9f5e7e (MD5)<br>Approved for entry into archive by Ana Rosa Silva (arosa@ufpa.br) on 2014-09-04T16:52:02Z (GMT) No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Dissertacao_PropostaGerenciamentoDados.pdf: 5547219 bytes, checksum: de79901f4ae801f0d5d68e9d4c9f5e7e (MD5)<br>Made availa
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21

Fussangel, Kathrin. "Subjektive Theorien von Lehrkräften zur Kooperation : eine Analyse der Zusammenarbeit von Lehrerinnen und Lehrern in Lerngemeinschaften." kostenfrei, 2008. http://elpub.bib.uni-wuppertal.de/edocs/dokumente/fbg/paedagogik/diss2008/fussangel.

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22

Achterberg, Susanne. "Intime Nachrichten : die geschlechtliche und generationale Ordnung in sexuellen Aufklärungsratgebern für Jugendliche." kostenfrei, 2007. http://elpub.bib.uni-wuppertal.de/edocs/dokumente/fbg/soziologie/diss2008/achterberg.

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23

Seo, Bo-Kyung. "Ereignis- und bewegungskorrelierte evozierte Potentiale und kognitive Leistung bei der Aufmerksamkeitsdefizit-, Hyperaktivitätsstörung (ADHS) im Erwachsenenalter." kostenfrei, 2008. http://elpub.bib.uni-wuppertal.de/edocs/dokumente/fbg/psychologie/diss2008/seo.

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24

Colpo, Fabiano. "Residual stress characterization in a single fibre composite specimen by using FBG sensor and the OLCR technique /." [S.l.] : [s.n.], 2006. http://library.epfl.ch/theses/?nr=3533.

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25

Baños, López Rocío. "Diseño y caracterización de dispositivos codificadores y decodificadores para sistemas OCDMA Coherentes." Doctoral thesis, Universitat Politècnica de València, 2015. http://hdl.handle.net/10251/52022.

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[EN] In this thesis we propose the design and characterization of advanced optical de- vices used in coherent direct sequence optical en/decoding, also called temporal phase en/decoding, based on SSFBGs (Super-Structured Fiber Bragg Grating). The aim of this thesis is to enhance the overall performance of the proposed devi- ces used in optical en/decoding and their characteristics, such as: insertion losses and reflectivity, spectral bandwidth, spectral efficiency and chromatic dispersion present in the optical fiber used in the Telecommunication network. To achieve this goal, modifications in
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26

Silva, Gleison Elias da. "Desenvolvimento de transdutor em fibra óptica com estrutura hí­brida LPG-FBG para medição de propriedades térmicas de materiais." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-27022018-102025/.

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Este trabalho apresenta o estudo, a implementação e a caracterização de transdutores compostos por uma estrutura formada por grades de Bragg (FBG, Fiber Bragg Gratings) e grades de período longo (LPG, Long Period Gratings) em fibra óptica com cobertura metálica autoaquecida para medição da condutividade térmica e da difusividade térmica de materiais baseado no método do fio quente (HWM, Hot-Wire Method) convencional. O autoaquecimento da fibra óptica do dispositivo desenvolvido neste trabalho é provocado pela luz de espectro infravermelho injetada por um laser de bombeamento, que é espalhada p
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Hasanovic, Selma. "Metformin eller insulin vid behandling av graviditetsdiabetes : Effekten av metformin versus insulin vid sänkning av FBG och 2-hr PG." Thesis, Linnéuniversitetet, Institutionen för kemi och biomedicin (KOB), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-104187.

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Gestational diabetes mellitus (GDM ) is a disease that appears during pregnancy due to an insulin resistance. GDM is associated with increased risks for complications both to the mother and the child during pregnancy. These risks include conditions such as neonatal macrosomi and hypoglycemia for the child. This leads to increased risk for cesarean section and birth injuries. GDM can be treated with a changed diet supported with exercise. If the blood glucose levels still remain high, insulin or metformin medication can be introduced to treat the patient. Metformin is a safe and effective anti-
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28

Gardáš, Vít. "Analýza signálů ze senzorických systémů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-376960.

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This master’s thesis is focused on sensory systems and analysis of such signals. In the frst part, a theoretical analysis of each sensory system is conducted. Followingly, appropriate flters were used to process these signals. The last part of this thesis deals with the analysis of measured data.
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29

Fung, Wing Wah. "Lightly cemented rubber tire chips as highway pavement sub-base and the use of fiber Bragg's grating (FBG) as instrumentation sensors /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202004%20FUNG.

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30

Muci, Elgi. "Ottimizzazione del posizionamento di sensori ottici per il monitoraggio strutturale." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23466/.

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Tutte le strutture, che si tratti di aeromobili, navi, ponti, impianti eolici, condotte idrauliche, o altro, sono soggette a svariati fattori, interni ed esterni, che possono provocare usura o malfunzionamenti. Le cause scatenanti possono essere, ad esempio: il deterioramento, un processo di costruzione non effettuato a regola d’arte, la mancanza di controlli di qualità o una situazione estrema (come un incidente o condizioni ambientali estreme). Per riuscire a osservare questi cambiamenti nel materiale e a reagire in modo corretto prima che ne conseguano gravi danni, è fondamentale implemen
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31

CHEN, WEI. "AN INNOVATIVE FIBRE BRAGG GRATING BASED SENSING SYSTEM." Doctoral thesis, Politecnico di Torino, 2016. http://hdl.handle.net/11583/2665349.

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Fiber Bragg grating (FBG) based sensors are one of the most promising devices for optical sensing. FBGs have been used in an increasing number of applications in the past 20 years: most notable examples are in health monitoring of large structures, such as bridges, dams, buildings, and planes, but they are also employed for sensing of chemicals and in medicine. The reasons for their popularity in such a large variety of fields are the well-mastered and repeatable fabrication technology, combined with high sensitivity, light weight and intrinsic electromagnetic immunity. M
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Lanzoni, Maicol. "Applicazione di reticoli di Bragg "chirped" per il monitoraggio strutturale di laminati CFRP." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8512/.

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L’uso dei materiali compositi è andato aumentando negli ultimi decenni per la loro elevata rigidezza, la resistenza specifica e il possibile risparmio, notevole in termini di peso dell’intera struttura. Tali materiali introducono però nuove problematiche riguardanti le modalità di danneggiamento e il comportamento a fatica. Mentre questi fenomeni sono relativamente ben compresi nei materiali metallici, per una struttura in composito non esistono ancora modelli in grado di predire con sufficiente affidabilità l’evoluzione del danneggiamento. Negli ultimi anni la ricerca si è focalizzata sull
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Castellanos, Carlos. "Development of a validation shape sensing algorithm in Python with predictive and automatedanalysis." Thesis, Uppsala universitet, Avdelningen för systemteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-454942.

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Difficulties with wind turbines can arise during operation due to externalforces provoked by the wind. Calculating the deflection of the blades can beused to give break points for maintenance, design and/or monitoring purposes. Fiber Bragg Grating (FBG) sensors can be installed on the windblades to detect signals that can be reinterpreted as deflection in differentdirections. In this project a tool was developed that can take this information in real time to analyze critical issues which is important to save timeand operational and maintenance costs (O&amp;M). To do so, a predictive model is u
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Al-Tarawneh, Mu'ath. "Traffic Monitoring System Using In-Pavement Fiber Bragg Grating Sensors." Diss., North Dakota State University, 2019. https://hdl.handle.net/10365/31539.

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Recently, adding more lanes becomes less and less feasible, which is no longer an applicable solution for the traffic congestion problem due to the increment of vehicles. Using the existing infrastructure more efficiently with better traffic control and management is the realistic solution. An effective traffic management requires the use of monitoring technologies to extract traffic parameters that describe the characteristics of vehicles and their movement on the road. A three-dimension glass fiber-reinforced polymer packaged fiber Bragg grating sensor (3D GFRP-FBG) is introduced for the tra
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da, Silva Falcao Bruno. "CO2-rock interaction during CO2-enriched brine injection into storage reservoirs using NMR integrated with fiber optic sensors." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2022. https://ro.ecu.edu.au/theses/2505.

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The combustion of fossil fuels has led to a global temperature increase due to the emission of carbon dioxide, which is the major contributor to global warming. The mitigation of CO2 emissions into the atmosphere is therefore critical, where new technologies need to be urgently developed and employed on a large scale. One promising method is to capture anthropogenic CO2 and store it in geological formations, e.g. depleted oil and gas reservoirs and saline aquifers. This process is referred to as carbon capture and storage (CSS). The storage of CO2 in depleted oil and gas reservoirs that have t
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Kunzler, Wesley Mont. "Fiber Optic Sensor Interrogation Advancements for Research and Industrial Use." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2608.

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Spectrally-based fiber optic sensors are a rapidly maturing technology capable of sensing several environmental parameters in environments that are unfitting to electrical sensors. However, the sensor interrogation systems for this type of sensors are not yet fit to replace conventional sensor systems. They lack the speed, compact size, and usability necessary to move into mainstream test and measurement. The Fiber Sensor Integrated Monitor (FSIM) technology leverages rapid optical components and parallel hardware architecture to move these sensors across the research threshold into greater ma
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Argelli, Michael. "Monitoraggio strutturale (structural health monitoring) di laminati CFRP tramite reticoli di Bragg in fibra ottica." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/6729/.

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Lo studio si propone di valutare la capacità dei reticoli di Bragg in fibra ottica, di individuare e monitorare danneggiamenti presenti all'interno di laminati in composito, tramite l'analisi degli spettri riflessi dai reticoli stessi. Sono stati utilizzati due tipi diversi di stratificazione dei laminati, per valutare il diverso comportamento dei reticoli di Bragg inseriti all'interno dei laminati. Le proprietà dei materiali e degli spettri riflessi dai reticoli, sono state messe in relazione qualitativamente e quantitativamente, al fine di sviluppare un valido metodo di Structural Health Mo
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Sancho, Durá Juan. "Photonic-assisted RF Signal Processing based on Slow and Fast Light Technological Platforms." Doctoral thesis, Universitat Politècnica de València, 2012. http://hdl.handle.net/10251/16471.

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Los efectos de la luz lenta y luz rápida (SFL) han mostrado unas capacidades excepcionales sobre el control dinámico de la velocidad de la luz en diferentes medios. Una de las motivaciones más estimulantes redica en la potente aplicación de estos sistemas en el marco del procesado fotónico de señales de radio frecuencia (RF). En esta tesis doctoral, se evalúan las prestaciones de las plataformas de SFL actuales para desarrollar múltiples tareas que se requieren en el campo de la fotónica de microondas (MWP) con el valor añadido de sintonizabilidad y operación en banda ancha. En esta contexto,
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Chilelli, Sean Kelty. "Structural health monitoring with fiber Bragg grating sensors embedded into metal through ultrasonic additive manufacturing." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1563529169604482.

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Silva, Gleison Elias da. "Implementação e caracterização da resposta dinâmica de transdutores de deformação e temperatura a fibras ópticas baseados em redes de Bragg." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-12122011-140541/.

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Essa dissertação de mestrado é dedicada ao estudo, desenvolvimento e caracterização da resposta dinâmica de transdutores de deformação mecânica e de temperatura baseados em grades de Bragg inscritas em fibras ópticas (FBG). Como não se encontram referências diretas na literatura da área sobre a caracterização da resposta dinâmica de sensores de temperatura e deformação a FBG, percebeu-se a importância de realizar um trabalho com ênfase nesse aspecto. O desenvolvimento de transdutores FBG de deformação e de temperatura com resposta dinâmica rápida é de grande importância, já que as grade
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Gonçalves, Leonardo Correia. "Configuração interferómetrica diferencial para medição de deformação e temperatura." Master's thesis, Universidade da Madeira, 2010. http://hdl.handle.net/10400.13/248.

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Este documento descreve a implementação de um sistema interferométrico diferencial para a interrogação de redes de Bragg com o objectivo da medição diferencial de deformação e temperatura. Foram implementados dois sistemas de interrogação, um utiliza uma configuração implementada através de instrumentação física, e outro, uma configuração implementada através de instrumentação virtual, desenvolvida com recurso ao ambiente LabVIEW®. O esquema diferencial permite diminuir os efeitos de sensibilidade cruzada indissociáveis a estes sistemas. Foram realizados testes de deformação e temperatura de
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42

Dejdar, Petr. "Grafické uživatelské rozhraní pro senzorické systémy." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377158.

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Master thesis is focused on creating graphical user interface for the sensorical system based on Phase-OTDR. Theoretical part describes optical fibers, explains the principle of Bragg gratings, their production and their use in sensors. Methods of optical fiber attenuation and phase OTDR measurement are also described. Other part is focused on LabVIEW programming software and utilization of sensorical system and its components. Practical part deals with the user interface itself, which consists of two tabs. The first tab is designed for evaluation and display of measured data. The second tab i
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43

Helán, Radek. "Modelování a optimalizace komplexních vláknových difrakčních struktur." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233450.

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The thesis discusses the fiber Bragg gratings simulations, analysis and design. In the present time, there are several methods to simulate fiber gratings response based on the stated parameters that define their dimensions and material features. However, this work deals with a different issue, that is the synthesis of the input parameters for demanded spectral responses. The main aim of the work is to achieve a synthesis method that would help to discover parameters describing advanced grating structure, based on the required spectral reflectivity. The basic demand for the parameter synthesis
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Nefissi, Naoufel. "Modélisation et mesure des efforts axiaux le long d'une fixations montées avec interférence. Application aux structures aéronautiques." Thesis, Toulouse, INSA, 2012. http://www.theses.fr/2012ISAT0042/document.

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Les assemblages à base de fixations montées avec interférence et prétension sont largement utilisés dans le domaine de la construction aéronautique, notamment dans les zones structurales fortement chargées et soumises à des sollicitations de fatigue. Les performances de ces assemblages sont sensibles à de nombreux paramètres liés à la géométrie et aux matériaux mis en jeu. Pour optimiser la qualité de ces liaisons et atteindre les gains de durée de vie attendus, il est important de disposer de modèles à la fois rapides et fiables qui permettent, dès la phase de conception, d’évaluer l’influenc
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Lyöri, V. (Veijo). "Structural monitoring with fibre-optic sensors using the pulsed time-of-flight method and other measurement techniques." Doctoral thesis, University of Oulu, 2007. http://urn.fi/urn:isbn:9789514287022.

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Abstract This thesis deals with the developing of fibre-optic instruments for monitoring the health of civil engineering and composite structures. A number of sensors have been tested for use with different road structures, concrete bridges, fibre reinforced polymer (FRP) containers and other composite specimens, the interrogation methods being mainly based on measuring optical power and time-of-flight (TOF). The main focus is on the development of a fibre-optic TOF measurement system and its applications, but different sensing needs and fibre-optic measurement systems are also reviewed, with
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Fedin, Igor. "Peculiarities of the Thermo-Optic Coefficient at High Temperatures in Fibers Containing Bragg Gratings." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1309207081.

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Prášil, Jiří. "Metody řešení vlivu optické disperze na stávajících optických sítích." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-218200.

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This diploma thesis deals with analysis of current diagnostic methods of optical networks, and it is focused on optical fiber dispersion in singlemode fibers. The work starts with a describtion chromatic dispersion and polarization mode dispersion, causes of and thein influence on the transmitted signal at the beginning. There are set out principles and their appropriate use in the list of measuring methods. Furthermore, the work are given the current possibilities for compensation above dispersions. The sixth chapter deals with the measurements and simulations of real routes in the OptiSystem
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BERRI, PIER CARLO. "Design and development of algorithms and technologies applied to prognostics of aerospace systems." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2927464.

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Huang, Po-Ying, and 黃柏穎. "Development of a Hollow FBG Load Cell." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/v58hvf.

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碩士<br>國立交通大學<br>土木工程系所<br>102<br>Load cell has been used as a primary tool to monitor the pre-stress conditions for earth anchors. The currently used load cells are mostly electrical, the electric circuit is prone to electromagnetic interference (EMI) and humidity induced short circuit. Optical fiber Bragg grating (FBG) has the advantage of being durable and immune to lightning, EMI and humidity. This research intends to develop an FBG based load cell to take advantage of these unique capabilities. The load cell was designed so that the FBG was always subject to tensile strain to increase the
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Yu, Yi-Lin, and 游易霖. "FBG-Based Optical Modules:Investigations and Lightwave Applications." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/92666640664914540823.

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博士<br>國立臺灣科技大學<br>電子工程系<br>101<br>This thesis is studied the fiber grating, and apply it for different optical fiber laser and module. The dissertation consists of three parts. In first part, we develop Ytterbium doped fiber laser. We change the parameter to optimize the characteristic of output laser, including using different length of Ytterbium doped fiber, various reflectivity fiber grating and different types of fiber mirrors. Additional, a homemade tunable fiber grating inserted can make the fiber laser achieved widely tunable range. Also, we develop near single frequency fiber laser bas
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