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Dissertations / Theses on the topic 'Fibre Bragg Grating sensors'

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Published: 4 June 2021
Last updated: 1 February 2022

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1

Fallon, Richard W. "Fibre Bragg grating strain sensors." Thesis, Aston University, 2000. http://publications.aston.ac.uk/15304/.

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The fabrication of in-fibre Bragg gratings (FBGs) and their application as sensors is reported. The strain and temperature characteristic results for a number of chirped and uniform gratings written into three different host fibres are presented. The static and dynamic temperature response of a commercially available temperature compensated grating is reported. A five sensor wavelength division multiplexed fibre Bragg grating strain measurement system with an interrogation rate of 25 Hz and resolution of 10 was constructed. The results from this system are presented. A novel chirped FBG interr
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2

Brady, Geoffrey Phillip. "Fibre Bragg grating sensors : interrogation and multiplexing techniques." Thesis, University of Kent, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309781.

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3

Rigg, Euan. "Fibre Bragg grating sensors for component shape change measurement." Thesis, Heriot-Watt University, 2004. http://hdl.handle.net/10399/247.

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4

Main, Andrew Stuart. "Low-cost interrogation of optical fibre Bragg grating sensors." Thesis, Aston University, 2007. http://publications.aston.ac.uk/8101/.

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Through the application of novel signal processing techniques we are able to measure physical measurands with both high accuracy and low noise susceptibility. The first interrogation scheme is based upon a CCD spectrometer. We 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 sensors to measure the distributive strain response of a mechanical system. U
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5

Nuttavut, Narin. "Optical fibre sensors based on Bragg grating : an interferometric approach." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396042.

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6

Bezombes, Frédéric. "Fibre Bragg grating temperature sensors for high-speed machining applications." Thesis, Liverpool John Moores University, 2004. http://researchonline.ljmu.ac.uk/5630/.

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In high-speed grinding research, it is required to measure temperature within the workpiece. Present techniques are thermocouple based, and often suffer from excessive electrical noise on the signal. This thesis presents a number of novel and existing optical sensing devices that overcome this limitation and also, in some cases, offer greater 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 ma
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7

Lloyd, Glynn D. "Resonant cavity Fibre Bragg grating sensor interrogation." Thesis, Aston University, 2004. http://publications.aston.ac.uk/8007/.

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This thesis presents a novel high-performance approach 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) schemes are contrasted against the technological and commercial advantage of TDM. The author’s hypothesis that ‘it should be possible to achieve TDM FBG sensor interrogation using an electrically switched semiconductor optical amplifier (SOA)’ is then explaine
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8

Rito, Rodolfo N. L. "Monitoring damage development in composite repairs using chirped fibre Bragg grating sensors." Thesis, University of Surrey, 2015. http://epubs.surrey.ac.uk/808351/.

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Composite repairs are often used for damaged structures in order to recover the mechanical properties of the original structure. During service, there is the possibility that damage will occur in the repaired region and hence it would be useful to be able to monitor such repairs. This research investigates the use of chirped fibre Bragg grating (CFBG) sensors to monitor the development of fatigue damage initiation and growth in the repaired region of three different repair systems, i.e. glass fibre reinforced polymer (GFRP)-to-GFRP scarf repair, GFRP-to-GFRP patch repair and a GFRP patch repai
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9

Dockney, Michael Lee. "Fabrication of wavelength division multiplexed in-fibre Bragg grating arrays for structural monitoring applications." Thesis, Cranfield University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245338.

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10

Comanici, Maria Iulia. "Interrogation systems for fiber Bragg grating-based sensors." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=95079.

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As the potential application of fiber optic sensors broadens, there is much interest in finding measurement systems that are simple, cost effective and show high power efficiency. The latter is extremely useful when dealing with multiplexed sensors distributed over large distances, which results in high signal attenuation and limits the number of sensors that can be interrogated by a minimum number of measurement units. In this thesis we explore a fiber laser-based wavelength-to-power mapping interrogation system for wavelength-division-multiplexed FBG sensors, and we prove that such solution
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11

Flockhart, Gordon Marr Henderson. "Interferometric interrogation of optical fibre bragg grating sensors for temperature independent strain measurement." Thesis, Heriot-Watt University, 2001. http://hdl.handle.net/10399/381.

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12

Mastro, Stephen A. El-Sherif Mahmoud Abd-El-Rahman. "Optomechanical behavior of embedded fiber Bragg grating strain sensors /." Philadelphia, Pa. : Drexel University, 2005. http://dspace.library.drexel.edu/handle/1860/515.

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13

Schomer, John J. "Embedding fiber Bragg grating sensors through ultrasonic additive manufacturing." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1483670362650083.

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14

Aiyar, Arvind Ramaswamy. "Determination of round exit velocity using fiber Bragg grating sensors." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1398.

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Thesis (M.S.) -- University of Maryland, College Park, 2004.<br>Thesis research directed by: Electrical and Computer Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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15

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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16

Levin, Klas. "Durability of Embedded Fibre Optic Sensors in Composites." Doctoral thesis, Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3145.

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17

SORIA, DARWIN GRAMER FALCON. "MONITORING CORROSION DEFECTS IN PLANAR STRUCTURES WITH FIBER BRAGG GRATING SENSORS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2011. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=19352@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>O foco do presente trabalho é a detecção e o monitoramento de defeitos tais como perda de espessura por corrosão ou dano produzido por impacto em painéis metálicos planos. O sistema proposto emprega sensores de deformação a fibra óptica baseados em redes de Bragg, que possuem alta capacidade de multiplexação. O campo de deformações produzido na superfície da placa por um mesmo carregamento, cuja amplitude pode variar, é continuamente comparado a um mapa de referência, obtido com a estrutura íntegra ou na presença um defeito previ
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18

Al-Tarawneh, Mu’ath Ahmad. "In-Pavement Fiber Bragg Grating Sensors for Weight-In-Motion Measurements." Thesis, North Dakota State University, 2016. https://hdl.handle.net/10365/28248.

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Estimation a traffic over the design period is one of the critical factors in pavement design. Weight-in-motion (WIM) sensors have become popular for weight measurements. A three-dimension glass fiber-reinforced polymer packaged fiber Bragg grating sensor (3D GFRP-FBG) is introduced for in-pavement WIM measurement at low speed. Sensitivity study shows that the sensor is very sensitive to the sensor installation depth and the loading position. The developed 3D GFRP-FBG sensor is applicable for most practical pavements and it also shows a very good long-term durability. Among the three component
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19

Cooper, David J. F. "Time division multiplexing of a serial fibre optic Bragg grating sensor array." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0001/MQ45424.pdf.

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20

Hu, Di. "Fully Distributed Multi-parameter Sensors Based on Acoustic Fiber Bragg Gratings." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/85112.

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A fully distributed multi-parameter acoustic sensing technology is proposed. Current fully distributed sensing techniques are exclusively 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 conceived with inspiration from optical fiber Bragg grating (FBG). This AFBG structure exploits periodic spatial perturbations on an elongated waveguide to sense variations
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21

Mulvihill, Paul. "Manufacturing optical fibre Bragg grating strain sensors with an excimer laser for high-strain, multiplexed embedded applications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq29369.pdf.

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22

Morana, Adriana. "Gamma-rays and neutrons effects on optical fibers and Bragg gratings for temperature sensors." Phd thesis, Université Jean Monnet - Saint-Etienne, 2013. http://tel.archives-ouvertes.fr/tel-01064993.

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The nuclear industry shows an increasing interest in the fiber optic technology for both data communication and sensing applications in nuclear plants. The optical fibers offer several advantages and the sensors based on this technology do not need any electrical power at the sensing point, they have a quick response and they can be easily multiplexed: in the case of a temperature sensor, several thermocouples can be substituted by a single fiber, resulting in a decrease of the waste material. The fission reactors are a very harsh environment: it is characterized by the highest dose of gamma-r
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23

Liu, Weilin. "Real-time Interrogation of Fiber Bragg Grating Sensors Based on Chirped Pulse Compression." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20289.

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Theoretical and experimental studies of real-time interrogation of fiber Bragg grating (FBG) sensors based on chirped pulse compression with increased interrogation resolution and signal-to-noise ratio are presented. Two interrogation systems are proposed in this thesis. In the first interrogation system, a linearly chirped FBG (LCFBG) is employed as the sensing element. By incorporating the LCFBG in an optical interferometer as the sensor encoding system, employing wavelength-to-time mapping and chirped pulse compression technique, the correlation of output microwave waveform with a chirped
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24

Capell, Tobias F. "Applications of embedded chirped fibre Bragg grating sensors for damage and defect detection in composites and composite bonded joints." Thesis, University of Surrey, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.580337.

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This thesis reports investigations into the application of a type of optical sensor to detect and monitor damage in composites structures. The chirped fibre Bragg grating (CFBG) is a type of optical component that is sensitive to both strain and temperature and is commonly found in the telecommunications industry as a filter. Its small diameter and low cost makes it a potentially inexpensive sensor ideal for embedding in composite materials. This work consisted of extending the use of CFBG sensors into three areas: monitoring of disbonding in composite-metal bonded joints; detection of manufac
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25

Molony, Anna. "The application of fibre Bragg grating networks as strain sensors and as phased array antenna true time delay elements." Thesis, Aston University, 1996. http://publications.aston.ac.uk/15355/.

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The fabrication of in-fibre Bragg gratings, and the application of arrays of such gratings as strain sensors and as true time delay elements for the control of phased array antennas is reported. Chirped period Bragg gratings were produced using the fibre deformation fabrication technique, with chirps of between 2.9nm and 17.3nm achieved. Arrays of 5mm and 2mm long uniform period Bragg gratings were fabricated using the inscription method, for use as true time delay elements,dissimilar wavefronts and their spectral characteristics recorded. The uniform period grating arrays were used to create
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26

Reeves, Richard John. "Demodulation and de-multiplexing of a fibre Bragg grating sensor array using volume holograms." Thesis, Cranfield University, 2009. http://hdl.handle.net/1826/4461.

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The demodulation of a Wavelength Division Multiplexed FBG sensor array by a matching array of holograms hosted within a Volume Holographic (VH) material is considered within this thesis. The FBG sensor elements possess separate quiescent wavelengths and operate within different wavelength ranges. The edge of the transfer function of the demodulating holographic element is aligned with the operating range of the matching sensor element. The holographic element then diffracts a fraction of the sensor signal depending on its instantaneous wavelength. The signals from each of the sensor elements a
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27

Propst, Adam Christopher. "Damage Monitoring in Woven Composites Using Fiber-Bragg Grating Sensors on Multiple Time Scales." NCSU, 2009. http://www.lib.ncsu.edu/theses/available/etd-04252009-090648/.

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This study investigates the application of Fiber Bragg Grating (FBG) optical sensors interrogation techniques over several time scales to monitor damage in composite structures due to low velocity impacts events. Optical fiber sensors are embedded into carbon fiber/epoxy resin woven composites using a single-step cure process. The composite specimens are subjected to multiple low energy impacts until failure. Impact events are characterized by acceleration and position sensors integral to the impactor head. The embedded FBG sensors are interrogated using three different interrogation technique
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28

Sans, Canovas Daniel. "Advances in fibre Bragg grating sensors for damage detection in composite laminates: application in quasi-static and fatigue delamination tests." Doctoral thesis, Universitat de Girona, 2013. http://hdl.handle.net/10803/117357.

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The use of composite materials in industrial applications such as aeronautical, aerospace or wind energy production has greatly increased in recent decades. Due to their inherent properties, these materials allow lighter, larger and more resistant structures. However, the use of composite materials for components or structures with highly stringent requirements, is hampered by the lack of knowledge of their reliability. In this thesis, some fundamental aspects about the use of fibre Bragg grating (FBG) sensors for internal strain measurements in composite laminates are discussed. In addition,
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29

Pfeiffer, Frank. "Einfluß ionisierender Strahlung auf die Funktionsfähigkeit faseroptischer Bragg-Gitter-Sensoren - Influence of ionizing radiation on the operativeness of fiber-optic Bragg-grating sensors." Gerhard-Mercator-Universitaet Duisburg, 2001. http://www.ub.uni-duisburg.de/ETD-db/theses/available/duett-05252001-105026/.

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Fiber-optic Bragg-Grating sensors are often the only possibility to perform measurements under adverse environmental conditions, ionizing radiation among them. However, up to now no basic research has been carried out to determine the influence of ionizing radiation on the operativeness of Bragg-Grating-Sensors. Within this work gratings of type I have been written into 3 different singlemode-fibers, with different Ge-content, one of them hydrogen-loaded. Various kinds of ionizing radiation (electrons, photons, He-nuclei) of various energy have been applied to the gratings and grating-temperat
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30

Espejo, Robert Joseph. "Low coherence interferometry: Applications to component metrology and high spatial resolution fiber Bragg grating sensors." Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3308677.

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31

OLIVIERI, BRUNO SAPHA. "INTERROGATION SYSTEM OF FIBER BRAGG GRATING SENSORS USING TIME DIVISION MULTIPLEXING AND WAVELENGTH DIVISION MULTIPLEXING." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5905@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Um sistema de interrogação de sensores a rede de Bragg utilizando multiplexação no tempo e multiplexação no comprimento de onda é proposto e demonstrado. O sistema apresenta uma solução para a medição de grandezas associadas ao espectro de reflexão de redes de Bragg, possibilitando o aumento do número de sensores a rede de Bragg monitorados através de grandes distâncias em uma mesma fibra óptica, sem um aumento significativo dos custos. O aspecto inovador deste sistema reside na particular associação das seguintes caracte
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32

LOUZADA, DANIEL RAMOS. "DETECTION AND CHARACTERIZATION OF STRUCTURAL DAMAGE USING FIBER BRAGG GRATING SENSORS AND ARTIFICIAL NEURAL NETWORKS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2013. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=37156@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>O aumento dos custos relacionados aos processos de manutenção em estruturas como aeronaves, aliadas à crescente demanda das mesmas, alimentam a necessidade de investimentos em técnicas inovadoras de monitoramento estrutural. Dessa forma, o trabalho realizado nesta tese, busca o desenvolvimento de uma técnica de monitoramento ativo, visando o acompanhamento de parâmetros da estrutura analisada, a fim de identificar e caracterizar processos de
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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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34

Müller, Uwe Christian [Verfasser]. "Structural Monitoring and Displacement Field Estimation based on Distributed Fiber Bragg Grating Sensors / Uwe Christian Müller." München : Verlag Dr. Hut, 2011. http://d-nb.info/1011441764/34.

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35

CRUZ, HUGO ANGEL BARREDA DE LA. "ANALYSIS OF THE CALIBRATION TO BRAGG GRATING SENSORS IN FIBER OPTICS INTERROGATED TROUGHT FIXED FILTERS TECHNIQUE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2007. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=11923@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Nesse trabalho, descreve-se o desenvolvimento de uma calibração do sistema de interrogação dos espectros das redes de Bragg baseando-se em uma simulação numérica adotada de testes experimentais. O objetivo é calibrar a técnica de demodulação óptica utilizando dois filtros de transmissão fixos, procurando-se principalmente a posição verdadeira dos sensores. O espectro refletido de uma rede tem uma forte dependência com o espectro da luz incidente que resultará em uma deformação no espectro refletido da rede, gerando um desvi
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Chwang, Jerry J. S. "Evaluation of fiber optic Bragg grating sensors in monitoring the integrity of structures repaired with bonded patches." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0018/MQ45572.pdf.

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NUNES, LUIZ CARLOS DA SILVA. "ANALYSIS OF THE DEMODULATION TECHNIQUE BASED ON FIXED FILTERS IN THE INTERROGATION OF FIBER BRAGG GRATING SENSORS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5385@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>DEUTSCHER AKADEMISCHER AUSTAUSCHDIENST<br>A análise da técnica de demodulação usada para interrogar sensores a rede de Bragg em fibras ópticas baseadas em filtros fixos foi realizada teoricamente e experimentalmente. Diferentes configurações de sistemas foram analisadas modificando a posição espectral dos filtros, assim como os níveis de potência óptica obtidos nos fotodetectores. Foram realizadas medidas com o tempo de integração que variavam de 0.01 a 1s e estimado o limite de baixa freqüência. Comparação entre os re
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QUINTERO, SULLY MILENA MEJIA. "APPLICATIONS OF FIBER BRAGG GRATING SENSORS IN THE MEASUREMENT OF PH AND OF STRAIN IN HARD THIN FILMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2006. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9243@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Este trabalho versa sobre duas diferentes aplicações de sensores a redes de Bragg em fibra óptica. A primeira consiste no desenvolvimento de uma técnica de sensoriamento do pH empregando fibra óptica, que visa a monitoração contínua e permanente deste parâmetro em poços de petróleo depletados e de injeção. Nesta aplicação, as redes de Bragg são acopladas, através de um mecanismo transdutor, a sistemas poliméricos que respondem a alterações do pH apresentando uma variação expressiva de seu volume. O tempo de resposta e o fat
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Lebid, Solomija [Verfasser], Christian [Gutachter] Schäffer, Jaroslaw [Gutachter] Bobitski, and Werner [Gutachter] Daum. "Perturbations in behaviour of fibre Bragg grating sensors introduced by local thermal and mechanical influences / Solomija Lebid ; Bundesanstalt für Materialforschung und -prüfung (BAM) ; Gutachter: Christian Schäffer, Jaroslaw Bobitski, Werner Daum." Berlin : Bundesanstalt für Materialforschung und -prüfung (BAM), 2004. http://d-nb.info/1122836635/34.

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40

Bordonaro, Giancarlo Giuseppe. "Nonlinear System Identification of Physical Parameters for Damage Prognosis and Localization in Structures." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/30019.

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The understanding of how structural components endure loads, in particular variable loads, is that these components gradually, over some period of time depending on the nature of the loading and the material, develop a microcrack. After some additional time and loading, the microcrack grows to a size that might be detected. Beyond that point, the microcrack propagates in a manner that can be reliably predicted by computer analysis codes. Consequently, one can define different stages for the life of a structural component. These are: 1) the period prior to the formation of a microcrack, 2) the
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Mahesh, Kondiparthi. "Novel Methods To Interrogate Fiber Bragg Grating Sensors." Thesis, 2010. http://etd.iisc.ernet.in/handle/2005/1926.

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A novel detection technique to estimate the amount of chirp in fiber Bragg gratings (FBGs) is proposed. This method is based on the fact that reflectivity at central wavelength of FBG reflection changes with strain/temperature gradient (linear chirp) applied to the same. Transfer matrix approach was used to vary different grating parameters (length, strength and apodization) to optimize variation of reflectivity with linear chirp. Analysis is done for different sets of ‘FBG length-refractive index strength’ combinations for which reflectivity vary linearly with linear chirp over a decent measu
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Guru, Prasad A. S. "Fiber Bragg Grating Sensors : An Exploration Of Applications In Diverse Fields." Thesis, 2012. http://etd.iisc.ernet.in/handle/2005/2507.

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Sensors have become essential elements in human life for safe and comfortable existence in the ever demanding world. Various technologies over decades have contributed in their own way fulfilling innumerable sensing requirements. The discovery of optical sensor technologies has revolutionized the sensing field due to their inherent advantages. Among the large number of fiber optic sensor technologies, FBG based sensors have become widely known and popular within and outside the photonics community and has seen a prominent rise in their utilization. This thesis explores the use of FBG sensors
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43

Zhan, Chun. "Femtosecond laser inscribed fiber Bragg grating sensors." 2007. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-2298/index.html.

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44

Yamdagni, Sumeet. "Fiber Bragg Grating Interrogation Systems." Thesis, 2009. http://hdl.handle.net/2005/925.

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This thesis work deals with the development of three different categories of interrogation techniques for Fiber Bragg Grating based sensor networks. Such networks are used for structural health monitoring and other applications. A bulk grating based interrogation system is described first, which includes an optical source, switch, circulator, embedded controller, and software. The center wavelength determination technique employed is detailed and is shown to be highly accurate from test data. The comparison with resistance strain gauges is presented which shows that the system developed provi
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Dennison, Christopher Raymond Stuart. "Development and application of in-fibre Bragg grating based biomedical pressure sensors." Thesis, 2008. http://hdl.handle.net/1828/1025.

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Two in-fibre Bragg grating based optical pressure sensors were developed to address the limitations of conventional solid-state electronic biomedical sensors. The first sensor, developed for intervertebral disc pressure measurements varying over several MPa, had a major diameter of only 400 μm and sensing area of 0.03 mm2. This sensor was validated in spine biomechanics studies and was shown to: give accurate and repeatable measurements, be compatible with the small (e.g. cervical) discs, and alter disc mechanics less than the current alternative sensor. This sensor is also the smallest,
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Yang, Chao-hsiang, and 楊兆祥. "Fiber Sensors Based on Long Period Grating Series with Fiber Bragg Grating." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/02903471872113234178.

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碩士<br>逢甲大學<br>電機工程所<br>98<br>The content of this thesis is to investigate a new fiber sensor for simultaneously measuring the pressure and temperature with a packaged fiber Bragg grating (FBG) connected in a series with a long-period fiber grating (LPG). The central wavelength of an FBG is fabricated on the negative slope region of the loss peak of LPG transmission spectrum and the FBG is encapsulated in a polymer-half-filled metal cylinder with two openings on opposite sides of the wall of the polymer to measure the pressure. Utilizing the different optical response of the FBG and LPG, the ap
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Roberson, Craig Valentine. "An investigation into performance criteria for Fibre Bragg Grating sensors embedded in composite structures." Thesis, 2014. http://hdl.handle.net/10210/12124.

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M.Ing. (Mechanical Engineering)<br>The dissertation explores the applications and limitations of optic Fibre Bragg Grating (FBG) sensors for the purpose of structural health monitoring of high performance composite aerospace structures. The absence of a set of stringent performance criteria governing the form and function of a sensory system for embedded high performance applications highlights the major hurdle to be overcome before widespread acceptance of these technologies becomes apparent. The dissertation therefore develops through an extensive literature study a basic framework of perfor
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Fan, Chen-Chi, and 范振琦. "Array Type of Fiber Bragg Grating Strain Sensors." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/51338812607455297758.

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碩士<br>正修科技大學<br>電子工程研究所<br>95<br>The traditional sensor usually used a strainometer, capacitance, inductance, piezoelectric materials, and so on to be the modulation mechanism or the sensing element. In substance, this method always involves the measure of voltages or the galvanometry, so it is easy to be interfered with electromagnetism and the magnetic field, but the fibre-optic sensor is not. The fibre-optic sensor still can be used after irradiation treated Ionizing Radiation, so it applys to strict circumstances. For example, a nuclear power plant. This thesis utilizes Fiber Bragg Grating
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Chen, Chien-Cheng, and 陳建成. "The Design of Fiber Bragg Grating Vibration Sensors." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/58342265885099339027.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>91<br>The reflection wavelength of Fiber Bragg Grating is sensitive to the strain and the temperature’s variation. We use Fiber Bragg Grating to be the sensor head and measure the vibration frequency in constant temperature environment. The vibration of object can make the sinusoidal strain to Fiber Bragg Grating, and it will make a little phase difference to the light of the fiber. Using the interferometer and demodulation system, we can measure the phase difference and vibration frequency. Our sensor configuration is made up of imbalance Mach-Zehnder interferomet
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"Evaluation of optical fibre Bragg grating sensors on a sidewall wind tunnel balance." Thesis, 2015. http://hdl.handle.net/10210/13810.

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