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Dissertations / Theses on the topic 'Sensor fiber'

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Published: 28 June 2021

Last updated: 29 July 2025

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1

Maier, Eric William. "Buried fiber optic intrusion sensor." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/425.

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A distributed fiber optic intrusion sensor capable of detecting intruders from the pressure of their weight on the earth's surface was investigated in the laboratory and in field tests. The presence of an intruder above or in proximity to the buried sensor induces a phase shift in light propagating along the fiber which allows for the detection and localization of intrusions. Through the use of an ultra-stable erbium-doped fiber laser and phase sensitive optical time domain reflectometry, disturbances were monitored in long (several km) lengths of optical fiber. Narrow linewidth and low freq

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2

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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3

Beadle, Brad Michael. "Fiber optic sensor for ultrasound." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/17869.

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4

Beadle, Brad Michael. "Fiber optic sensor for ultrasound." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/19173.

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5

Wang, Xingwei. "Optical Fiber Tip Pressure Sensor." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/35490.

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<p> Miniature pressure sensors which can endure harsh environments are a highly sought after goal in industrial, medical and research fields. Microelectromechanical systems (MEMS) are the current methods to fabricate such small sensors. However, they suffer from low sensitivity and poor mechanical properties. </p><p> To fulfill the need for robust and reliable miniature pressure sensors that can operate under high temperatures, a novel type of optical fiber tip sensor only 125Î¼m in diameter is presented in this thesis. The essential element is a piece of hollow fiber which connects the fiber

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6

Ipson, Benjamin L. "Polarimetric Temperature Sensor Using Core-replaced Fiber." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd606.pdf.

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7

Andrews, Jeffrey Pratt. "Longitudinal misalignment based strain sensor." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/43283.

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<p>A practical fiber optic strain sensor has been developed to measure strains in the range of 0.0 to 2.0 percent strain with a resolution ranging between 10 and 100 microstrain depending on sensor design choices. This intensity based sensor measures strain by monitoring strain induced longitudinal misalignment in a novel fiber interconnection. This interconnection is created by aligning fibers within a segment of hollow core fiber. Related splice loss mechanisms are investigated for their effect on resolution. The effect of gauge length and launch conditions are also investigated.</p><br>Mast

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8

Bronk, Karen Srour. "Imaging based sensor arrays /." Thesis, Connect to Dissertations & Theses @ Tufts University, 1996.

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Thesis (Ph.D.)--Tufts University, 1996.<br>Adviser: David R. Walt. Submitted to the Dept. of Chemistry. Includes bibliographical references. Access restricted to members of the Tufts University community. Also available via the World Wide Web;

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9

Lee, Shiao-Chiu. "Axial offset effects upon optical fiber sensor and splice performance." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/91128.

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A kind of intensity modulated fiber sensor utilizing axial offset parameter is proposed. The theoretical analysis and experimental characteristics of this sensor are described. All the theoretical results derived in this thesis are based on assuming a uniform power distribution in the fibers. An expression of coupling efficiency of central dipped parabolic graded index fibers due to axial offset is derived. The results show less sensitivity to axial offset for the central dipped fibers than for the parabolic profile fibers without a dip. Expressions of coupling efficiency of graded index fib

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10

Rønnekleiv, Erlend. "Fiber DFB Lasers for Sensor Applications." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, 2000. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-498.

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11

Chen, Raymond M. Eng Massachusetts Institute of Technology. "Photoacoustic photonic crystal fiber gas sensor." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/41258.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.<br>Includes bibliographical references (p. 89-93).<br>Photoacoustic spectroscopy (PAS) is a form of laser spectroscopy that has demonstrated very high sensitivity for gas detection. Typically, PAS involves the absorption of a modulated laser beam by the gas species of interest, and the subsequent generation of acoustic waves at the modulation frequency. The amplitude of the acoustic signal, which can be measured by a microphone, can be amplified by several orders of magnitude wi

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12

Hernandez, Felipe Bueno. "Sensor de força utilizando Fiber taper." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18149/tde-27072016-074912/.

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Este trabalho teve por objetivo desenvolver e caracterizar um sensor de força utilizando uma fibra óptica modificada pelo processo conhecido como Fiber tapering. A fibra quando modificada deixa exposto o campo evanescente, o que a torna sensível a influências externas, e a luz guiada na fibra pode vir a sofrer reflexão interna total frustrada ao entrar em contato com materiais. Ao envolver a região modificada por um material elastomérico, a área de contato e consequentemente a atenuação torna-se uma função da intensidade da força aplicada, possibilitando então relacionar a força a atenuação da

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13

Chen, Qiao. "ESA based fiber optical humidity sensor." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/10134.

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Several techniques for measuring humidity are presented. The goal of the study is to use the electrostatic self-assembled monolayer synthesis process to fabricate a Fabry-Parot Cavity based optical fiber humidity sensor. The sensing scheme bases on the refractive index change with relative humidity of the film applied to the end of optical fiber. That is, the change in reflected optical power indicates certain humidity. To achieve this, some chemicals induce on specific coating materials were applied at the end of optical fiber. In this thesis, experimental results are given to prove that the

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14

Miller, Mark S. "Optical fiber-based corrosion sensor systems." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-03042009-041455/.

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15

Kiliç, Onur. "Fiber based photonic-crystal acoustic sensor /." May be available electronically:, 2008. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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16

Gaikwad, Parikshit S. "Chemically deposited optical fiber humidity sensor." Master's thesis, Mississippi State : Mississippi State University, 2003. http://library.msstate.edu/etd/show.asp?etd=etd-06092003-141607.

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17

Peterson, Brian James. "Wireless sensor interrogator design for passive, resonant frequency sensors using frequency modulation spectroscopy." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/peterson/PetersonB0509.pdf.

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The lack of passive, wireless, chemical and biological sensor systems is a significant impediment to sensor system applications. While active sensors with a wireless communications link continue to decrease in power consumption, they still require a power source, such as a battery. This active power consumption limits the useful life of the sensor and its applications. A more attractive solution would be a passive, wireless, chemical and biological sensor integrated with a wireless interrogation platform to monitor the sensor. The focus of this thesis is the realization of a wireless sensor in

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18

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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19

Cassino, Christopher Daniel. "Detection of fiber fracture in Unidirectional Fiber Reinforced Composites using an In-Plane Fiber Optic Sensor." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/32419.

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Fiber reinforced polymers (FRP) are an efficient and inexpensive method of repairing deteriorating infrastructure. FRP sheets can be applied to spalling bridge sections and columns to prevent further deterioration and increase stiffness. However, the effect of the environment on the long-term durability of FRP and how the various damage mechanisms initiate and develop are not known. Systems for structural health monitoring are being sought as a means of managing important components in transportation systems as assets in light of modern life cycle cost concepts. This study characterizes a fibe

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20

Wavering, Thomas A. "Optical Path Length Multiplexing of Optical Fiber Sensors." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36037.

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Optical fiber sensor multiplexing reduces cost per sensor by designing a system that minimizes the expensive system components (sources, spectrometers, etc.) needed for a set number of sensors. The market for multiplexed optical sensors is growing as fiberoptic sensors are finding application in automated factories, mines, offshore platforms, air, sea, land, and space vehicles, energy distribution systems, medical patient surveillance systems, etc. Optical path length multiplexing (OPLM) is a modification to traditional white-light interferometry techniques to multiplex extrinsic Fabry-Perot i

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21

Zhu, Yizheng. "Miniature Fiber-Optic Sensors for High-Temperature Harsh Environments." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/27762.

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Measurement of physical parameters in harsh environments (high pressure, high temperature, highly corrosive, high electromagnetic interference) is often desired in a variety of areas, such as aerospace, automobile, energy, military systems, and industrial processes. Pressure and temperature are among the most important of these parameters. A typical example is pressure monitoring in jet engine compressors to help detect and control undesirable air flow instabilities, namely rotating stall and surge. However, the temperatures inside a compressor could reach beyond 600°C for today's large engine

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22

Rugeland, Patrik. "Applications of monolithic fiber interferometers and actively controlled fibers." Doctoral thesis, KTH, Laserfysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118750.

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The objective of this thesis was to develop applications of monolithic fiber devices and actively controlled fibers. A special twin-core fiber known as a ‘Gemini’ fiber was used to construct equal arm-length fiber interferometers, impervious to temperature and mechanical perturbations. A broadband add/drop multiplexer was constructed by inscribing fiber Bragg gratings in the arms of a Gemini Mach-Zehnder interferometer. A broadband interferometric nanosecond switch was constructed from a micro-structured Gemini fiber with incorporated metal electrodes. Additionally, a Michelson fiber interfero

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23

Bangert, Adam. "Fiber optic sensor prototype for breast cancer imaging." Connect to resource, 2006. http://hdl.handle.net/1811/6455.

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Thesis (Honors)--Ohio State University, 2006.<br>Title from first page of PDF file. Document formatted into pages: contains 33 p.; also includes graphics. Includes bibliographical references (p. 20). Available online via Ohio State University's Knowledge Bank.

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24

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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25

Luanje, Appolinaire Tifang. "INTEGRATED OPTICAL FIBER RAMAN SENSOR FOR CRYOGENIC APPLICATION." MSSTATE, 2008. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04042008-155057/.

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An integrated fiber optical Raman sensor was designed for real-time, non intrusive detection of liquid and gaseous mixtures at high pressure and high flow rates. The integrated sensor employs a high-power solid-state pumped Nd:YAG frequency doubled (532nm) laser (3W), a modified In Photonics Raman probe which has built-in Raman signal filter optics, and two high-resolution spectrometers and photomultiplier tubes (PMT) with selected bandpass filters to collect both N2 and O2 Raman signals. The detection unit was also integrated with Lab View software interfaced PMT modules for fast data acquisi

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26

Ekestam, Henrik, and Jim Larsson. "Temperature sensor based on dual fiber Bragg gratings." Thesis, KTH, Tillämpad fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-168137.

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The objective of the project was to examine if it was possible to develop a low-cost temperature sensor using dual fiber Bragg gratings (FBGs). The intention was to use one FBG as a reference and let the other FBG function as the sensor. The study shows that it is possible to characterize the temperature sensitivity of each FBG and use the reference to sweep over the applicable spectrum to find the Bragg-wavelength of the sensor. This could be done measuring only the total intensity instead of intensity per wavelength with an optical spectrum analyzer, and with high accuracy. Thus, it seems fe

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27

Schenström, Karl. "Biofunctionalization of a Fiber Optics-Based LSPR Sensor." Thesis, Linköpings universitet, Molekylär fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-125726.

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When exposed to light, metal nanoparticles exhibit a phenomenon known as LSPR, Localized Surface Plasmon Resonance. The wavelengths at which LSPR occurs is very dependent on the refractive index of the surrounding medium. Binding of biomolecules to the surface of gold nanoparticles result in a change in the refractive index that can be detected spectrophotometrically by monitoring the LSPR peak shift. When functionalized with the corresponding ligand(s), gold nanoparticles can be utilized in biosensors to detect the presence and concentration of a predetermined analyte. However, the system mus

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28

Chen, Xiaopei. "Fiber Optic Pressure Sensor Fabrication Using MEMS Technology." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/32744.

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A technology for fabricating fiber optic pressure sensors is described. This technology is based on intermediate-layer bonding of a fused silica ferrule to a patterned, micro-machined fused silica diaphragm, providing low temperature fabrication of optical pressure sensor heads that can operate at high temperature. Fused silica ferrules and fused silica diaphragms are chosen to reduce the temperature dependence. The fused silica diaphragms have been micro-machined using wet chemical etching in order to form extrinsic Fabry-Perot (FP) interferometric cavities. Sol-gel is used as an inter

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29

Tian, Zhipeng. "Sapphire Fiber Optic Sensor for High Temperature Measurement." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/91191.

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This dissertation focuses on developing new technologies for ultra-low-cost sapphire fiber-optic high-temperature sensors. The research is divided into three major parts, the souceless sensor, the simple Fabry-Perot (F-P) interrogator, and the sensor system. Chapter 1 briefly reviews the background of thermal radiation, fiber optic F-P sensors, and F-P signal demodulation. The research goal is highlighted. In Chapter 2, a temperature sensing system is introduced. The environmental thermal radiation was used as the broadband light source. A sapphire wafer F-P temperature sensor head was fabri

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30

Xiao, Hai. "Self-Calibrated Interferometric/Intensity-Based Fiber Optic Pressure Sensors." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/28845.

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To fulfill the objective of providing robust and reliable fiber optic pressure sensors capable of operating in harsh environments, this dissertation presents the detailed research work on the design, modeling, implementation, analysis, and performance evaluation of the novel fiber optic self-calibrated interferometric/intensity-based (SCIIB) pressure sensor system. By self-referencing its two channels outputs, for the first time to our knowledge, the developed SCIIB technology can fully compensate for the fluctuation of source power and the variations of fiber losses. Based on the SCIIB princ

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31

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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32

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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33

Holmberg, Patrik. "Laser processing of Silica based glass." Doctoral thesis, KTH, Laserfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173929.

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The main topic of this thesis work is photosensitivity and photo-structuring of optical fibers and bulk glass. Although research in the field of photosensitivity in glass and optical fibers has been ongoing for more than three decades, the underlying mechanisms are still not well understood. The objective was to gain a better understanding of the photo-response by studying photosensitivity from a thermodynamic perspective, as opposed to established research focusing on point defects and structural changes, and strain and stress in optical fibers. Optical fibers was mainly used for experimental

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34

Cameron, Alexander John. "A Bayesian approach to optimal sensor placement." Thesis, University of Oxford, 1989. http://ora.ox.ac.uk/objects/uuid:ad201132-d418-4ee4-a9d5-3d79bd4876a7.

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By "intelligently" locating a sensor with respect to its environment it is possible to minimize the number of sensing operations required to perform many tasks. This is particularly important for sensing media which provide only "sparse" data, such as tactile sensors and sonar. In this thesis, a system is described which uses the principles of statistical decision theory to determine the optimal sensing locations to perform recognition and localization operations. The system uses a Bayesian approach to utilize any prior object information (including object models or previously-acquired sensory

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35

Su, Xu. "Design and Evaluation of Off-centered Core Fiber for Gas Sensing." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/99348.

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Gas Sensing Has Become a Very Important and Attractive Technique Because of Its Various Applications, Such as in the Increasingly Concerning Case of Environmental Issues, Automobile Emission Detection, Natural Gas Leakage Detection, Etc. It Also Has Significant Applications in Industries, Such as Safety and Health Monitoring in Underground Mines. Among Those Sensing Areas, Fiber-optic Sensors Have Drawn Considerable Attention Because of Its Small Size, Light Weight, High Sensitivity, and Remote Sensing Capability. However, Current Fiber-optic Gas Sensing Techniques Have Several Limitations on

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36

Richardson, Douglas Harvey. "Fiber optic interferometric torque sensor with applications to milling." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/30056.

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To make unmanned machining viable it is necessary to monitor the machining process. The currently available sensor technology is not adequate to monitor all of the required aspects of the machining process. In this thesis a fiber optic milling machine torque sensor is proposed and experimentally analyzed. The initial tests, at low torque amplitudes, performed on the experimental prototype indicate that the proposed sensor may have performance characteristics which are superior to the characteristics of the currently used milling machine sensors. The proposed sensor has the advantages of sma

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37

Xu, Lina. "Optical fiber humidity sensor based on evanescent wave scattering." MSSTATE, 2004. http://sun.library.msstate.edu/ETD-db/theses/available/etd-07092004-112625/.

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An optical fiber humidity sensor has been devised using a porous sol-gel silica (PSGS) coating as a transducer. Evanescent wave scattering (EWS) in the PSGS coating. PSGS particles are highly hydrophilic and have a strong tendency to absorb water molecules from the surrounding environment. The absorbed water molecules form a thin layer on the inner surface of the pores inside the porous silica and enhance EWS, from which an indicatory signal can be obtained. The humidity sensor presented in this thesis has a fast response, is reversible, low cost, and has a broad dynamic relative humidity rang

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38

Qin, Zengguang. "Distributed Optical Fiber Vibration Sensor Based on Rayleigh Backscattering." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24105.

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This thesis includes studies of developing distributed optical fiber vibration sensor based on Rayleigh backscattering with broad frequency response range and high spatial resolution. Distributed vibration sensor based on all-polarization-maintaining configurations of the phase-sensitive optical time domain reflectometry (OTDR) is developed to achieve high frequency response and spatial resolution. Signal fading and noise induced by polarization change can be mitigated via polarization-maintaining components. Pencil-break event is tested as a vibration source and the layout of the sensing fib

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39

ROSAS, BRUNO PEREIRA. "OPTICAL FIBER SENSOR DISCRIMINATOR FOR JACKETED TANKS LEAKAGE DETECTION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2003. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=4280@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>AGÊNCIA NACIONAL DE PETRÓLEO<br>A contaminação do solo nos postos de serviço é um risco ambiental associado à atividade de distribuição de derivados de petróleo que precisa ser controlado. O aumento deste risco está diretamente ligado à idade dos tanques e tubulações e à baixa qualidade na operação dos postos. Tais problemas vêm sendo minimizados ao longo das duas ultimas décadas graças à utilização de equipamentos mais modernos e das crescentes exigências ambientais. Nesta tese foi desenvolvido e testado em laboratório u

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FILHO, WAGNER MUNDY VALVERDE. "DEVELOPMENT OF FIBER OPTIC ACOUSTIC SENSOR FOR ULTRASONIC FLOWMETER." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2001. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=19330@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>AGÊNCIA NACIONAL DE PETRÓLEO<br>Nesta dissertação são relatadas as etapas que resultam na construção do protótipo de um receptor acústico a Fibra Óptica (RAFO). O trabalho faz parte de um projeto mais amplo visando o desenvolvimento de um medidor de vazão sônico baseado em fibras ópticas. Nesta fase inicial, os esforços foram voltados para a concepção, construção e testes do protótipo do transdutor, responsável pela deteção dos sinais sônicos emitidos por uma fonte, baseado em tecnologia de fibras ópticas. O uso de um sensor extr

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CHIANG, CHIA-CHI, and 江嘉琪. "Multimode Tapered Fiber Sensor." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/23264534191282230961.

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碩士<br>國立中正大學<br>物理學系暨研究所<br>100<br>In this thesis, fabrication of a multimode tapered fiber is presented. The coating and cladding of the fiber was first removed by using the CO2 laser. Afterward, while heating the uncladded fiber with the Bunsen burner, a tapered fiber was made by pulling the fiber to a desired length by a translational stage. The ability of the fabricated tapered fiber to detect the refractive index (RI) of surrounding media is investigated. It is found that the RI sensitivity of this type of tapered fiber increased with the decreasing of waist diameter of the tapered fiber.

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Chiu, Chih-Hung, and 邱志鴻. "Fiber grating tilt sensor." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/54464845313846271843.

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碩士<br>逢甲大學<br>電機工程所<br>99<br>A tilt sensor mainly composed of long period fiber grating is proposed. The long period grating (LPG) is glued by a plate with slot. The plate make the LPG be suspended and is fixed inside a container. The container is filled with some liquid until half-length of LPG is immersed. 　　When the tilt sensor is inclined, the liquid depth will be changed because of the flowing liquid. The different immersed lengths of LPG result to the transmission power changing. Then we can read the value transmission power to estimate the tilt angle. 　　The normal tilt sensors usually h

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Kuruba, Nithin Shekar. "Hollow fiber coupler sensor." Thesis, 2018. https://dspace.library.uvic.ca//handle/1828/10404.

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This thesis presents a method to fabricate a robust optical directional coupler sensor using a solid core fiber (SCF) and a hollow core fiber (HCF). Through evanescent wave coupling mechanism, the optical power is exchanged between SCF and HCF. The hollow core of the HCF can be filled with liquid samples to alter the coupling ratio which imparts change in amount of light propagating through the SCF. Thus, it gives the coupler with ability of sensing refractive index of the sample with good sensitivity of 4.03 ± 0.50 volts per refractive index units (V/RIU) for refractive indices ranging

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Yu-lin, Fang, and 方友霖. "Polarization optical fiber sensor." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/k5r32j.

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博士<br>國立高雄科技大學<br>機械工程系<br>107<br>This study proposes a multi-functional lab and used the principles of polarization light, long period fiber grating (LPFG) along with inductive couple plasma-Etcher to develop a POL-NLPFG lab on fiber sensor for strain. Using the POL-NLPFG sensors to detect the variations of the longitudinal loading. According to the results of the experiments, finding that the longitudinal loading are strengthen, the phenomenon of the transmission loss agrees with the coupled-mode theory and the dips of transmission loss performance a function of cosine. The sensor that exe

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"Some applications of optical fibre sensor." Chinese University of Hong Kong, 1989. http://library.cuhk.edu.hk/record=b5886613.

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CHEN, JUN-YI, and 陳俊逸. "Improved Optical Fiber pH Sensor." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/pyzzk5.

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碩士<br>銘傳大學<br>電子工程學系碩士班<br>104<br>PH value is used to specify the acidity or basicity of an aqueous solution because many biological and chemical reactions depend on suitable pH value. PH sensors are widely used in chemical plants, laboratories and hospitals, so a fiber optic pH sensor is proposed to measure the pH value of an aqueous solution. With the help of an acid-base indicator, an aqueous solution with different pH value has different absorption of light. Detecting the optical power of an aqueous solution, the pH value can be assessed. However, according to previous researches, the meas

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Guo, Jia-hao, and 郭家豪. "Microfluidics for Fiber-sensor Application." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/84663206057135502240.

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碩士<br>國立成功大學<br>光電科學與工程研究所<br>97<br>In this dissertation, a fiber-base sensor integrated in a microfluidic system is investigated. The fiber sensor is able to detect the refractive index change at the exposed fiber core created by a time-controlled HF etch of the fiber. Effects of the etch time and exposed length to the sensitivity are also studied. The fiber sensor is also modified by covalent bonding of colloid gold nanoparticles to the exposed fiber core surface. The strong localized surface plasmon resonance scattering from the gold nanoparticles is able to enhance the sensitivity of t

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Lin, Ming Ching, and 林銘清. "Application of Optical Fiber Amplifier For Fiber Sensor and Fiber Ring Laser." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/81156727069054242645.

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碩士<br>國立交通大學<br>光電工程系所<br>93<br>In the first part of the thesis, we propose and investigate experimentally a gain-clamped S-band erbium-doped fiber amplifier (EDFA), a stable and single-longitudinal-mode oscillation of an S-band EDF ring laser. The behaviors and performances of the S-band amplifier have also been discussed in the text. Single-longitudinal-mode laser output can be realized by employing a Fabry-Perot filter and a saturable-absorber-based autotracking filter composed of an unpumped EDF and an optical reflector. The performance of output power is larger then 10 dBm and a side-mode

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Guru, Prasad A. S. "Fiber Bragg Grating Sensors : An Exploration Of Applications In Diverse Fields." Thesis, 2012. https://etd.iisc.ac.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 sensor

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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.

Full text

Abstract:

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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