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Dissertations / Theses on the topic 'Fibre optic sensor networks'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Street, Andrew M. "Spread spectrum techniques for multiplexing and ranging applications." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259828.

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2

Zhang, Kuiwei. "Surface roughness and displacement measurements using a fibre optic sensor and neural networks." Thesis, Brunel University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246145.

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3

Fang, Xiaojun. "Nonreciprocal effects and their applications in fiber optic networks." Diss., Virginia Tech, 1996. http://hdl.handle.net/10919/40337.

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Nonreciprocity is a fundamental property of networks. Unlike electronic networks theory, optical network theory is still a field to be investigated. Lightwave systems, including fiber optic and integrated optic, are becoming more and more complex, new function blocks ( or components) and networking strategies are very important for future highly integrated lightwave circuits. Several common nonreciprocal optical effects studied in this disseration and several basic applications to fiber components and fiber optic metrology systems analyzed. The common optical nonreciprocal phenomena include t

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4

Goyal, Sandeep. "Fiber optic current sensor network." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq24716.pdf.

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5

Canalizo, M. Andres E. "Fiber optic current sensor network, innovations and applications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0019/MQ48057.pdf.

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6

MacLean, Alistair. "A distributed fibre optic water sensor." Thesis, University of Strathclyde, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248853.

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7

Liang, Yuanxin. "Respiration monitoring with a fibre optic sensor." Swinburne Research Bank, 2008. http://hdl.handle.net/1959.3/47121.

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Thesis (PhD) - Swinburne University of Technology, Faculty of Engineering and Industrial Sciences, Centre for Atom Physics an Ultra-fast Spectroscopy, 2008.<br>A thesis submitted for the degree of Master of Engineering, Centre for Atom Physics an Ultra-fast Spectroscopy, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, 2008. Typescript. Bibliography: p. 143-149.

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8

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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9

Farahi, F. "Fibre optic interferometric thermometers and multiplexed systems." Thesis, University of Kent, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382854.

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10

McCulloch, Scott. "Fibre optic microsensors for intracellular chemical measurements." Thesis, University of Strathclyde, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248617.

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11

Ingold, Joseph Patrick. "Fiber optic sensors and networks for U.S. Navy shipboard tests and trials." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/41974.

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After a U. S. Navy ship is built but before it is placed into service, many performance tests of all shipboard systems are conducted. These tests vary greatly in who performs the test, the purpose of each test, which system or systems are being tested, and the duration of each test. As naval warfare ships become increasingly complicated, the performance tests that are conducted also become numerous and complex. The current test philosophy prescribes that for each test and test organization, telemetry cables for electrical sensors are strung throughout the ship immediately prior to the test bei

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12

Bownass, David Casson. "Passive fibre-optic humidity sensing for telecommunications networks." Thesis, Heriot-Watt University, 1998. http://hdl.handle.net/10399/1191.

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13

MacPherson, William Neil. "Fibre optic sensors for applications in turbomachinery research." Thesis, Heriot-Watt University, 1999. http://hdl.handle.net/10399/585.

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14

McMurtry, Stefan. "Multipoint humidity sensing based upon a multiplexed fibre optic sensor." Thesis, University of Kent, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310209.

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15

Nieves, Bogonez Francisco Daniel. "Manufacturing and characterisation of a fibre optic acoustic emission sensor." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7762/.

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The value of Remote Condition Monitoring for the real-time evaluation of the structural integrity of critical components is undeniable. Fibre-reinforced polymer composites are a class of materials which offer significant advantages over conventional metal alloys used for manufacturing load bearing structures in cases where weight and/or energy consumption need to be kept to a minimum, for example automotive and aerospace applications. This is due to the excellent strength to weight ratio that FRPCs exhibit. However, their strongly anisotropic microstructure of poses significant challenges for

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16

Burns, Jonathan Mark. "Development and characterisation of a fibre-optic acoustic emission sensor." Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3409/.

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A requirement for online monitoring has emerged owing to the susceptibility of fibre reinforced composite materials to sub-surface damage. Acoustic emission (AE) monitoring is understood to detect damage well before catastrophic failure; research in AE sensing therefore continues to attract significant attention. The research presented herein provides a review of a fibre-optic-based AE sensor design. Developmental work was performed to evaluate both sensor fabrication and packaging-related issues. The characteristics of the sensor were found to be influenced by: (i) the type of optical fibre u

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17

King, David Gareth. "Fibre-optic sensor development for process monitoring of epoxy resins." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8698/.

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An investigation was undertaken to examine the performance of a Fresnel reflection sensor (FRS) incorporated into a differential scanning calorimeter (DSC) to track the cross-linking of epoxy resins. The initial design used a micrometer translation stage to lower the FRS through an orifice in the DSC platinum lid and onto the pan containing the sample. During exothermic cross-linking experiments, the resin refractive index and the heat evolved were measured simultaneously, allowing for direct comparison between the data. Combining the two measurement techniques produced a powerful hyphenated a

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18

Moss, Steven E. "Wavelength division multiplexed optical fibre sensor networks." Thesis, Manchester Metropolitan University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334635.

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19

Sun, Tong. "Fluorescence-based fibre optic sensor systems for temperature and strain measurement." Thesis, City University London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287664.

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20

Fneer, Mohamed K. "Development of fibre optic based ammonia sensor for water quality management." Thesis, City University London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363350.

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21

Sloan, William D. "The development of a fibre-optic chemical sensor for calcium ions." Thesis, Glasgow Caledonian University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251184.

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22

Clowes, John Redvers. "Fibre optic pressure sensor for downhole monitoring in the oil industry." Thesis, University of Southampton, 2000. https://eprints.soton.ac.uk/42437/.

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Cost-effective oil and gas production is becoming more important than ever. The availability of downhole information is seen to be the key to increasing oil-recovery efficiency, currently estimated to be 35% on average for North Sea oil-wells. The SD-series pressure sensor out-performs any existing downhole pressure gauge in the world and is to be made commercially-available to the global oil industry in the year 2000.

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23

Khalil, Nahla Mahmood. "Novel optoelectronic temperature sensor having application in the biomedical field." Thesis, City University London, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328417.

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24

Madruga, Saavedra Francisco Javier. "Contribución al desarrollo de sensores de temperatura y redes de sensores en tecnología de fibra óptica." Doctoral thesis, Universidad de Cantabria, 2006. http://hdl.handle.net/10803/10707.

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Este trabajo de tesis recoge las contribuciones aportadas en el campo de los sensores de fibra óptica en tres ámbitos de trabajo. Un sistema sensor de alta temperatura sin contacto con transductores de fibras ópticas de sílice se ha presentado. Dos topologías de "ojo abierto" y "ojo cerrado" y un algoritmo de decodificación "pirometría de banda dual" propuesto en este trabajo son las novedosas aportaciones presentadas. El sistema ha sido validado en laboratorio y en pruebas de campo de forma exitosa. Para sensores de temperatura con fibras dopadas con Erbio se ha demostrado que su máxima sensi

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25

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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26

Orr, Philip J. G. "Magnetophotonic sensor systems for fibre-optic magnetic diagnostics in tokamak fusion reactors." Thesis, University of Strathclyde, 2011. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=23931.

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Electrical power generation through controlled nuclear fusion has the potential to make a substantial contribution to the global generation pool within the next century. However, continuous operation of fusion reactors is not yet achieved. As such, a key objective of the next-generation machines is to increase the duration of operational pulses. As fusion reactors progress towards steady-state operation, the use of present inductive transducers as part of critical magnetic diagnostic systems becomes increasingly unfeasible. In this thesis, it is proposed that due to their record of high perfor

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27

Haaksman, Ronald P. H. "Design of a fibre optic acoustic sensor array : sensitivity and noise properties." Thesis, University of Southampton, 2002. https://eprints.soton.ac.uk/15486/.

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In this thesis the study of a multiplexed Fibre Optic Acoustic Sensor (FOAS) system is presented. Narrowband reflectors (Fibre Bragg Gratings or FBGs) define sensing sections of 12.5 metres, which then act as Fabry-Perot (FP) cavities. Low-coherence interferometry is used to interrogate the sensors with an accuracy of 50 µrad/√Hz, in good agreement with the theoretically predicted value. Heterodyne signal processing is used to eliminate low frequency environmental noise. The performance of the sensor is checked by a sinusoidal calibration signal generated by a PZT fibre stretcher. The sensor h

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28

Pung, H. K. "Flood routing techniques for fibre optic local area networks with arbitrartopology." Thesis, University of Kent, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332715.

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29

Barton, Elena. "Detection of matrix cracking in a GFRP laminate using a fibre optic sensor." Thesis, University of Surrey, 2000. http://epubs.surrey.ac.uk/2230/.

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30

Hickey, Michelle. "A new fibre optic photoplethysmographic sensor for the assessment of splanchnic organ perfusion." Thesis, City University London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.508374.

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A new reflectance fibre optic photoplethysmographic (PPG) sensor, comprising of red (660 nm) and infrared (850 nm) emitters, a photodiode and 600 ?m fibre optic cables, was developed to allow for the intraoperative assessment of PPG signals and the preliminary estimation of SpO2 from splanchnic organs. An identical peripheral sensor was also developed to allow for the qualitative and quantitative comparison between PPG signals obtained from splanchnic organs and those from the traditional peripheral site (finger or toe). A three channel instrumentation system (splanchnic PPG, peripheral PPG, a

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31

Harvey, Daniel Peter. "The combination of smart hydrogels and fibre optic sensor technology for analyte detection." Thesis, Aston University, 2011. http://publications.aston.ac.uk/15806/.

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The subject of investigation of the present research is the use of smart hydrogels with fibre optic sensor technology. The aim was to develop a costeffective sensor platform for the detection of water in hydrocarbon media, and of dissolved inorganic analytes, namely potassium, calcium and aluminium. The fibre optic sensors in this work depend upon the use of hydrogels to either entrap chemotropic agents or to respond to external environmental changes, by changing their inherent properties, such as refractive index (RI). A review of current fibre optic technology for sensing outlined that the m

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32

Heininger, Hilmar. "Využití optovláknových senzorů pro aplikace ve stavebním inženýrství při použití široce přeladitelného laseru." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-233659.

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Předložená disertační práce zkoumá možnosti použití nového typu polovodičového MGY- Laseru elektricky laditelného v širokém spektrálním rozsahu a zabývá se možnostmi jeho nasazení v optovláknové senzorové síti založené na metodě FBG (Fiber Bragg Grating). Výzkum byl započat komplexními dlouhodobými testy reálného měřícího scénáře z oblasti stavebnictví, sestaveného pro účely ověření limitujících aspektů současných technik. Inženýrské aplikace nabízejí velké množství vzájemně se vylučujících požadavků pro návrh strukturálních senzorových systémů. Tyto požadavky jsou sdíleny mnoha dalšími techno

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33

Hadley, Glyn James Matthew. "Development and in-vitro evaluation of a potentially implantable fibre-optic glucose sensor probe." Thesis, Bournemouth University, 2002. http://eprints.bournemouth.ac.uk/404/.

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Type I diabetics need regular injections of insulin to survive. Insulin allows the cells of the body to extract glucose from the blood supply to use as fuel. Without insulin the cells turn to other backup fuel sources,this can cause side effects that are quickly fatal or gradual wasting of the bodies tissues. The use of insulin, however, is not danger free, as an incorrect dosage can quickly lead to the reduction of glucose circulating in the blood to drop to a dangerously low level. Without glucose circulating in the blood supply the brain quickly runs out of fuel causing coma and death. Beca

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34

Weaver, R. C. "A fibre-optic microcalorimeter for studying interactions of gases with thin film sensor materials." Thesis, University of Kent, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233913.

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35

Jason, Johan. "Theory and Applications of Coupling Based Intensity Modulated Fibre-Optic Sensors." Licentiate thesis, Mid Sweden University, Department of Information Technology and Media, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-7057.

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<p>Optical fibre sensors can be used to measure a wide variety of properties. In some cases they have replaced conventional electronic sensors due to their possibility of performing measurements in environments suffering from electromagnetic disturbance, or in harsh environments where electronics cannot survive. In other cases they have had less success mainly due to the higher cost involved in fibre-optic sensor systems. Intensity modulated fibre-optic sensors normally require only low-cost monitoring systems principally based on light emitting diodes and photo diodes. The sensor principle it

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36

Kunert, Kristina. "Fibre-Optic AWG Networks Supporting Real-Time Communication in High-Performance Embedded Systems." Licentiate thesis, Halmstad University, Embedded Systems (CERES), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-56.

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<p>High-performance embedded systems communicating heterogeneous traffic with high bandwidth and strict timing requirements are in need of more efficient communication solutions. This thesis proposes two multi-wavelength passive optical networks able to meet these demands. The networks are based upon a single-hop star topology with an Arrayed Waveguide Grating (AWG) placed in the centre. The intended application areas for the two networks are short range embedded communication systems like System Area Networks (SANs) and router architectures with electronic queuing. The AWG’s attractive proper

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37

Cheevers, Kevin. "Optical Fibre-Based Hydrophone and Critical Ignition in Detonation Cells." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42793.

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This thesis is composed of two distinct parts. The first part of this work addresses the problem of critical ignition behind a decaying shock wave in the context of cellular detonations. Low-pressure (4.1 kPa) shock tube experiments were performed in a thin rectangular channel using the highly-unstable mixture of CH4 + 2O2 and the weakly-unstable mixture of 2H2 + O2 + 7Ar, with Schlieren visualization of the flow field. The dynamics of the lead shock in a detonation cell was reconstructed from measurements of the lead shock position and curvature. The post-shock state and the expansion rate al

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38

Clark, Joanne Louise. "Laser cooling in the condensed phase." Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266518.

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39

Mei, Ying. "Error analysis for distributed fibre optic sensing technology based on Brillouin scattering." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/278660.

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This dissertation describes the work conducted on error analysis for Brillouin Optical Time Domain Reflectometry (BOTDR), a distributed strain sensing technology used for monitoring the structural performance of infrastructures. Although BOTDR has been recently applied to many infrastructure monitoring applications, its measurement error has not yet been thoroughly investigated. The challenge to accurately monitor structures using BOTDR sensors lies in the fact that the measurement error is dependent on the noise and the spatial resolution of the sensor as well as the non-uniformity of the mon

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40

Radi, Haidar M. "Frequency hopping spread spectrum multiplexing for interferometric optical fibre sensor networks." Thesis, Manchester Metropolitan University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387483.

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41

Jason, Johan. "Fibre-Optic Displacement and Temperature Sensing Using Coupling Based Intensity Modulation and Polarisation Modulation Techniques." Doctoral thesis, Mittuniversitetet, Avdelningen för elektronikkonstruktion, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-18964.

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Optical fibre sensors are employed in the measurements of a number of different physical properties or for event detection in safety and security systems. In those environments which suffer from electromagnetic disturbance, in harsh environments where electronics cannot survive and in applications in favour of distributed detection, fibre-optic sensors have found natural areas of use. In some cases they have replaced conventional electronic sensors due to better performance and long-term reliability, but in others they have had less success mainly due to the higher costs which are often involv

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42

Shaar, A. A. "A study of code-division multiple-access with reference to fibre-optic local-area networks." Thesis, University of Kent, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353184.

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43

Howie, Judith Ann Barnard. "An investigation into the use of fluorescent compounds as detecting materials in a fibre optic anaesthetic gas sensor." Thesis, University of the West of England, Bristol, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387333.

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44

Ellis, Andrew. "All optical networking beyond 10 Gbits/s OTDM networks based on electro-optic modulators and fibre ring lasers." Thesis, Aston University, 1997. http://publications.aston.ac.uk/7978/.

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This thesis examines options for high capacity all optical networks. Specifically optical time division multiplexed (OTDM) networks based on electro-optic modulators are investigated experimentally, whilst comparisons with alternative approaches are carried out. It is intended that the thesis will form the basis of comparison between optical time division multiplexed networks and the more mature approach of wavelength division multiplexed networks. Following an introduction to optical networking concepts, the required component technologies are discussed. In particular various optical pulse so

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45

Dokos, Leonidas. "In-situ detection and assessment of low velocity impact-induced damage in composite materials using developed fibre optic sensor technology." Thesis, University of Southampton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420204.

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46

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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47

Stevens, Renaud. "Modulation Properties of Vertical Cavity Light Emitters." Doctoral thesis, Stockholm : Tekniska högsk, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3240.

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48

Enckell, Merit. "Lessons Learned in Structural Health Monitoring of Bridges Using Advanced Sensor Technology." Doctoral thesis, KTH, Bro- och stålbyggnad, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-48131.

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Structural Health Monitoring (SHM) with emerging technologies like e.g. fibre optic sensors, lasers, radars, acoustic emission and Micro Electro Mechanical Systems (MEMS) made an entrance into the civil engineering field in last decades. Expansion of new technologies together with development in data communication benefited for rapid development. The author has been doing research as well as working with SHM and related tasks nearly a decade. Both theoretical knowledge and practical experience are gained in this constantly developing field. This doctoral thesis presents lessons learned in SHM

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49

Vošček, Jakub. "Optické vlákno jako distribuovaný teplotní senzor." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-433164.

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The financial requirements between fiber optic sensors and conventional sensors are gradually declining, which, despite many advatages and wide range of applicationas, has slowed down the demand for these sensors. With the demand for fiber optic sensors also grow the requirements for the parameters of these sensors. This thesis deals with distributed temperature fiber optic sensors. Non--linear phenomen in optical fibers, such as Raman scattering is used for measuring with these sensors. This scatterin was used to obtain information about temperature, which effected the optical cable under the

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50

Ulbricht, Andreas, Maik Gude, Daniel Barfuß, Michael Birke, Andree Schwaar, and Andrzej Czulak. "Potential and application fields of lightweight hydraulic components in multi-material design." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200294.

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Hydraulic systems are used in many fields of applications for different functions like energy storage in hybrid systems. Generally the mass of hydraulic systems plays a key role especially for mobile hydraulics (construction machines, trucks, cars) and hydraulic aircraft systems. The main product properties like energy efficiency or payload can be improved by reducing the mass. In this connection carbon fiber reinforced plastics (CFRP) with their superior specific strength and stiffness open up new chances to acquire new lightweight potentials compared to metallic components. However, complex

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