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Relevant bibliographies by topics / Distributed reflectometry / Dissertations / Theses

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Dissertations / Theses on the topic 'Distributed reflectometry'

Author: Grafiati

Published: 25 May 2024

Last updated: 19 July 2025

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1

Luo, Linqing. "Time-frequency localisation of distributed Brillouin Optical Time Domain Reflectometry." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274568.

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Distributed fibre optic sensing (DFOS) is essential for structural health monitoring (SHM) of strain changes induced during the lifetime of a structure. Among different DFOS systems, the Brillouin Optical Time Domain Reflectometry (BOTDR) takes the advantages of obtaining full frequency spectrum to provide strain and temperature information along the optic fibre. The key parameters of distributed fibre optic sensors, spatial and frequency resolution, are strongly linked with the time-frequency (T-F) localisation in the system in three parts: pulse, hardware design and optical fibre. T-F locali

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2

Wu, Nan. "Optical Frequency Domain Reflectometry Based Quasi-distributed High Temperature Sensor." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/76905.

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Temperature sensing in harsh environment is desired in many areas, such as coal gasification, aerospace, etc. Single crystal sapphire is an excellent candidate for construction of harsh environment sensors due to its superior mechanical and optical properties even at temperature beyond 1600°C. The temperature inside a coal gasifier can be as high as 1200°C. And there is dramatic temperature gradient between the inner and outer layers of the gasifier refractory. Previous work has been done at Virginia Tech's Center for Photonics Technology to design and fabricate a sapphire wafer based Fabry-Pe

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3

Ek, Simon. "Distributed Temperature Sensing Using Phase-Sensitive Optical Time Domain Reflectometry." Thesis, KTH, Tillämpad fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-285902.

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This thesis explores and evaluates the temperature measuring capabilities of a phase-sensitive optical time-domain reflectometer (φ-OTDR), which exploits Rayleigh backscattering in normal single mode optical fibers. The device is constructed and its setup explained, and a protocol for making temperature measurements with it is developed. Performance tests are made and the device is shown to achieve fully distributed temperature measurements on fibers hundreds of meters in length with a spatial resolution of 1 m and a temperature resolution of 0.1 K. In addition, the capabilities of the device

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4

Saunders, Charles T. W. "Optical fibre sensing by time domain reflectometry." Thesis, University of Manchester, 2006. https://www.research.manchester.ac.uk/portal/en/theses/distributed-optical-fibre-sensing(f1857f29-5af2-4e94-97dd-164f3d67f29b).html.

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This thesis considers cost effective optical time domain rcflectometry for distributed fibre sensors, using new developments in light sources, detectors, fibres and computational power, suitable to interrogate distributed fibre sensors from 20m to 10km, within a £5,000 hardware budget. The characteristics of 200μm core diameter polymer clad silica (PCS) fibre and 980μm core diameter PMMA POF (polymethyl methacrylate plastic optical fibre) were theoretically evaluated including damage thresholds, optimum sensitisation (evanescent field attenuation and micro-bending) and launch conditions for op

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5

Stastny, Jeffrey Allen. "Time domain reflectometry (TDR) techniques for the design of distributed sensors." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09122009-040407/.

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6

Ren, Meiqi. "Distributed Optical Fiber Vibration Sensor Based on Phase-Sensitive Optical Time Domain Reflectometry." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34400.

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In this thesis, the work focuses on developing distributed optical fiber vibration sensors based on phase-sensitive optical time domain reflectometry (Φ-OTDR). Three works have been accomplished to improve the performances of Φ-OTDR for distributed vibration sensing. Firstly, Φ-OTDR based on a polarization diversity scheme is demonstrated to mitigate the polarization mismatch effect occurring in traditional systems. A theoretical analysis is performed in different polarization cases corresponding to coherent and polarization diversity detection. Φ-OTDR based polarization diversity shows a grea

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7

Bolen, Ryan. "A study of optical frequency domain reflectometry and its associated distributed sensor applications." Thesis, University of Ottawa (Canada), 2010. http://hdl.handle.net/10393/28464.

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Optical Frequency Domain Reflectometry (OFDR) is an interferometric technique which is capable of interrogating fibers under test (FUT) up to kilometers in length with millimeter resolution[10]. It does so by taking the Rayleigh backscattered light, or Fresnel back-reflected light and combining it with the reference arm to create a beating signal. The beating signal is then Fourier transformed to create a scattering profile of the FUT. Presented in this thesis are 5 novel OFDR configurations that improve the SNR in the spatial domain up to 26dB. As well, 4 new data analysis algorithms are pres

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8

Rizzolo, Serena. "Advantages and limitations of distributed optical-frequency-domain-reflectometry for optical fiber-based sensors in harsh environments." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSES013.

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L’accident de Fukushima-Daiichi du 11 Mars 2011 a fortement marqué l'industrie nucléaire en mettant en évidence plusieurs faiblesses dans le contrôle des systèmes critiques qui assurent la sécurité des centrales nucléaires, en particulier, lors de conditions accidentelles. Cette thèse a été réalisée en collaboration avec AREVA, groupe industriel français actif dans le domaine de l'énergie, avec l’objectif de réaliser des capteurs à fibres optiques résistants aux contraintes sévères d'une centrale nucléaire et, en particulier, de surveiller la température et le niveau de l'eau à l'intérieur d’u

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9

Randall, Summer Lockerbie. "Development and utilization of optical low coherence reflectometry for the study of multiple scattering in randomly distributed solid-liquid suspensions /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/8672.

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10

Bergdoll, Greg M. "Characterization of two Vernier-Tuned Distributed Bragg Reflector (VT-DBR) Lasers used in Swept Source Optical Coherence Tomography (SS-OCT)." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1461.

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Insight Photonic Solutions Inc. has continued to develop their patented VT-DBR laser design; these wavelength tunable lasers promise marked image-quality and acquisition time improvements in SS-OCT applications. To be well suited for SS-OCT, tunable lasers must be capable of producing a highly linear wavelength sweep across a tuning range well-matched to the medium being imaged; many different tunable lasers used in SS-OCT are compared to identify the optimal solution. This work electrically and spectrally characterizes two completely new all-semiconductor VT-DBR designs to compare, as well. T

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11

Taki, Nour. "Diagnosis of Soft Faults in Complex Wired Networks." Electronic Thesis or Diss., université Paris-Saclay, 2022. http://www.theses.fr/2022UPASG004.

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Les câbles électriques sont utilisés dans tous les secteurs pour transférer de l'énergie ou de l'information. Pendant le fonctionnement, les câbles peuvent être sujets à des défauts francs (circuit ouvert ou court-circuit) ou des défauts non-francs (endommagement de l'isolant, pincement, etc.) dus à une mauvaise utilisation, aux conditions environnementales ou au vieillissement. Ces défauts doivent être détectés à leur stade le plus précoce pour éviter une interruption de la fonction ou des conséquences plus graves. Parmi les méthodes de diagnostic des réseaux filaires qui ont été étudiées dan

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12

SAAVEDRA, ADELA ALENCAR. "STUDY OF FREQUENCY INSTABILITY AND THERMAL EFFECTS IN DISTRIBUTAL FEEDBACK LASERS WITH COHERENT REFLECTOMETRY." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1994. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8633@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>A reflectometria coerente tem se mostrado uma importante técnica para caracterização dos dispositivos ópticos e optoeletrônicos presentes nos sistemas de comunicações. Neste trabalho, a reflectometria coerente no domínio da freqüência foi utilizada no estudo das características dos lasers de semicondutor de realimentação distribuída. Foram realizadas medidas da resposta térmica do módulo laser, da linearidade da varredura em freqüência e da instabilidade de freqüência devido às reflexões da luz nas conexões do sistema. Co

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13

Juarez, Juan C. "Distributed fiber optic intrusion sensor system for monitoring long perimeters." Thesis, [College Station, Tex. : Texas A&M University, 2005. http://hdl.handle.net/1969.1/ETD-TAMU-1702.

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14

Vaněk, Stanislav. "Měření seismické činnosti pomocí optických vláknových senzorů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-376912.

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The aim of master's thesis is to get familiarized with the problems of measurement and analysis of seismic waves. Theoretical part deals with the description of seismic waves, especially their types, sources and properties. Attention was afterwards focused on the measurement systems of these waves, emphasis was placed on their principles and advantages. The practical part discusses methods of noise reduction and highlighting of significant events in measured data. At the end, individual methods are implemented into user-friendly graphical interface.

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15

Osman, Ousama. "Méthodes de diagnostic en ligne, embarqué et distribué dans les réseaux filaires complexes." Thesis, Université Clermont Auvergne‎ (2017-2020), 2020. http://www.theses.fr/2020CLFAC038.

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Les recherches menées dans cette thèse portent sur le diagnostic de réseaux filaires complexes à l’aide de la réflectométrie distribuée. L’objectif est de développer de nouvelles technologies de diagnostic en ligne, distribuées des réseaux complexes permettant la fusion de données ainsi que la communication entre les réflectomètres pour détecter, localiser et caractériser les défauts électriques (francs et non francs). Cette collaboration entre les réflectomètres permet de résoudre le problème d’ambiguïté de localisation des défauts et d’améliorer la qualité du diagnostic. La première contribu

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16

D'Aucelli, Giuseppe Maria. "Application and processing of Time Domain Reflectometry: a model-based approach." Doctoral thesis, 2018. http://hdl.handle.net/11589/120645.

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In this thesis a full featured workflow for the implementation of integrated diagnosis and monitoring systems based on Time Domain Reflectometry (TDR) is proposed. First it is shown how TDR probes installed in TDR-based setups can be adopted with simpler and cheaper techniques, then newly developed DSP algorithms for direct reflectogram analysis are presented. Afterwards, the TDR inverse problem, i.e. estimating the profiles of Transmission Line parameters from reflectograms, is dealt with. LineLab, a custom, reflectometry oriented frequency and time domain Transmission Line simulator is prese

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17

Scarpetta, Marco. "Signal processing and machine learning for TDR-based distributed sensing." Doctoral thesis, 2022. https://hdl.handle.net/11589/246220.

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Lo scopo di questa tesi è quello di presentare approcci innovativi di signal processing e machine learning per migliorare i risultati di stima ottenuti con la riflettometria nel dominio del tempo (TDR), ed estendere i suoi campi di applicazione e possibilità di utilizzo. Vengono studiate diverse varianti della tecnica di riflettometria e degli algoritmi di stima relativi. In primo luogo, vengono trattati gli algoritmi per realizzare in modo efficace e accurato la stepped-frequency waveform reflectometry (SFWR), vale a dire la tecnica riflettometrica basata sull'uso di pacchetti sinusoidali. La

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