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Dissertations / Theses on the topic 'Fibre optic'

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1

Attridge, John Worthington. "Fibre optic chemical sensing." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/37931.

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2

Zhang, Zhi Yi. "Fibre optic fluorescence thermometry." Thesis, City University London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359087.

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3

Hale, Zoe Miranda. "Fibre optic sensors using adiabatically tapered single mode fibres." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320155.

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4

Raum, Christopher Richard. "Fibre optic alignment using micromachines." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq30540.pdf.

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5

Pannell, C. N. "Fibre-optic laser Doppler velocimetry." Thesis, University of Kent, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383370.

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6

Akhavan, Leilabady P. "Monomode fibre optic interferometric sensors." Thesis, University of Kent, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383964.

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7

Farwell, Selina Gail. "Fused tapered fibre optic devices." Thesis, University of Southampton, 1997. https://eprints.soton.ac.uk/394564/.

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This thesis is concerned with the realisation of an all-fibre acousto-optic device which can be used as a switch, filter, frequency shifter, polarisation controller or amplitude modulator, depending on the configuration. The devices are based on the acousto-optic interaction in fused tapered couplers and as such are completely compatible with fibre networks. For the first time polarisation insensitive devices have been realised by precisely controlling the degree of fibre fusion in an asymmetric coupler. This thesis details the theoretical considerations required to fabricate and operate all-f
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8

Norman, D. C. C. "Interrogation of fibre optic sensors." Thesis, Aston University, 2006. http://publications.aston.ac.uk/8022/.

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The aim of the research work described in this thesis was to investigate the interrogation of fibre optic sensors using "off the shelf optical components and equipment developed mainly for the telecommunications industry. This provides a cost effective way of bringing fibre optic sensor systems to within the price range of their electro-mechanical counterparts. The research work focuses on the use of an arrayed waveguide grating, an acousto-optic tuneable filter and low-coherence interferometry to measure dynamic strain and displacement using fibre Bragg grating and interferometric sensors. Ba
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9

Chandani, Sameer M. "Fibre optic sensors based on D-shaped elliptical core fibres." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/31270.

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Optical fibre-based sensors have gained much attention over the past three decades and are gaining acceptance in many industries such as the aerospace, automotive, chemical processing, biological sensing, and medical industries. The work presented here demonstrates the use of D-shaped fibres as intensity-based fibre optic sensors. The fibres are etched to gain access to their evanescent optical fields and are operated in their "leaky", regimes, i.e., the regime in which optical power leaks out of their cores. The optical power transmission through the etched D-fibre, which constitutes the sens
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10

Hadjiprocopiou, Marios. "Fibre optic sensors for smart structures." Thesis, University of Surrey, 1997. http://epubs.surrey.ac.uk/842922/.

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"Smart Structures" or "Smart Skins" will require structurally integrated sensing systems that can operate in practical situations. Optical sensing techniques are receiving considerable attention for the monitoring of such systems. Single ended polarimetric sensors were utilized with a large dynamic range for strain measurements as surface mounted and embedded strain sensors in composite materials (glass fibre and carbon fibre reinforced polymers). They were also used to monitor the strain and the formation of microcracks in the glue line of carbon fibre reinforced polymer (CFRP) concrete beams
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11

Partridge, Matthew. "Fibre-optic sensors with molecular coatings." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/8028.

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The intrinsic stability of fibre optic based sensing systems offer a platform that is suited to hazardous waste detection in a wide range of environments. Over the last few years Cranfield University has been working on the development of chemical sensors using optical fibres in combination with a group of chemical recognition molecules called calixarenes. Calixarenes semi-selectively with a range of solvents of interest makes them useful for chemical detection systems. This work has primarily been focused on the use of calixarenes in sensing benzene and other hazardous solvents. However, this
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12

Inci, M. Naci. "Optical coatings for fibre optic sensors." Thesis, Heriot-Watt University, 1992. http://hdl.handle.net/10399/1455.

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13

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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14

Lutz, Raddatz. "High speed fibre-optic datacommunication systems." Thesis, University of Bristol, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264058.

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15

Balboa, I. "Low coherence fibre optic speckle interferometry." Thesis, Cranfield University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341038.

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16

Wang, Ji. "Novel multicomponent glasses and fibres for fibre-optic devices and systems." Thesis, University of Southampton, 1995. https://eprints.soton.ac.uk/399119/.

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This thesis describes the novel multicomponent glasses as the basis for fibre optic device and system applications. It is shown that multicomponent glasses are expected to greatly enhance the functionality of the fibre-optical devices and systems by compensating for the limitations of current silica-glass based fibre-devices. Fabrication and characterization of various multicomponent glasses and fibres suitable for specific applications have been investigated. The fabrication of rare-earth-doped multicomponent glasses based on commercial optical-glasses has been tackled by developing a novel d
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17

Sarantavgas, Georgios. "Investigation of a fibre-optic Fizeau interferometer configuration and coherent fibre-optic imaging bundles for optical coherence tomography." Thesis, Cranfield University, 2008. http://hdl.handle.net/1826/3759.

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Currently several medical imaging techniques are in operation in clinical environments that help the doctors to diagnose diseases before proceeding to treatment. This research investigated and implemented configurations for a medical imaging technique called Optical Coherence Tomography (OCT). The Michelson interferometer has been the principal configuration for OCT systems. For endoscopic OCT applications though such a configuration is susceptible to polarisation induced signal fading due to environmental changes within the sample arm, like fibre bending and temperature fluctuations. The deve
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18

Madden, W. Iain. "Analysis and development of all fibre wavelength selective fibre optic components." Thesis, University of Strathclyde, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248512.

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19

Wooler, John Peter Fairfax. "Fibre Optic Sensors for Dynamic Signal Detection." Thesis, Durham University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486827.

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There is both commercial and practical demand to extend the applications for which fibre optic sensors are used. This thesis describes the development of fibre optic sensors and systems for security and defence applications, based on established fibre-optic hydrophone I technology. Dynamic acoustic and seismic signals have been detected with sensor arrays, and used to demonstrate the detection of targets. Achievements have been made in the development and characterisation of entirely novel designs of fibre optic accelerometers and microphones, with the demonstration of arrays of these in pract
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20

Fu, Ling, and n/a. "Fibre-optic nonlinear optical microscopy and endoscopy." Swinburne University of Technology, 2007. http://adt.lib.swin.edu.au./public/adt-VSWT20070521.155004.

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Cancer is a major health problem in the world today. Almost all cancers have a significantly better chance for therapy and recovery if detected at their early stage. The capability to perform disease diagnosis at an early stage requires high-resolution imaging that can visualise the physiological and morphological changes at a cellular level. However, resolving powers of current medical imaging systems are limited to sub-millimeter sizes. Furthermore, the majority of cancers are associated with morphological and functional alterations of cells in epithelial tissue, currently assessed by invasi
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21

Fu, Ling. "Fibre-optic nonlinear optical microscopy and endoscopy." Australasian Digital Thesis Program, 2007. http://adt.lib.swin.edu.au/public/adt-VSWT20070521.155004/index.html.

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Thesis (PhD) - Swinburne University of Technology, Faculty of Engineering and Industrial Sciences, Centre for Micro-Photonics, 2007.<br>A thesis submitted for the degree of Doctor of Philosophy, Centre for Micro-Photonics, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, 2007. Typescript. Bibliography: p. 146-162.
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22

Sinha, Pranay G. "Fibre optic sensors for heat transfer studies." Thesis, Heriot-Watt University, 1991. http://hdl.handle.net/10399/802.

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23

Carolan, Thomas Andrew. "Acoustic emission detection by fibre optic interferometry." Thesis, Heriot-Watt University, 1994. http://hdl.handle.net/10399/1419.

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24

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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25

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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26

Selli, Raman Kumar. "Fibre optic temperature sensors using fluorescent phenomena." Thesis, City University London, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236641.

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27

Toft, Ian. "Fibre optic micro-photoluminescence of quantum nanostructures." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614103.

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28

Dudus´, Anna. "Optofluidics based fibre-optic variable optical attenuators." Thesis, University of Strathclyde, 2015. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=24985.

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An important research topic in engineering and science is the miniaturization of systems and components, where small size and weight, low power consumption and low manufacturing cost can offer new functionalities. In recent years the fields of optics and fluidics have merged to create the area of research known as "optofluidics". The unique properties of fluids (compression, flow, and variable refractive index) can be combined with optical devices to create systems with advantages in optical measuring, communication and imaging areas. Variable optical attenuators (VOAs) are components in optic
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29

Davies, Megan L. "Modified hydrogel matrices in fibre optic sensors." Thesis, Aston University, 1989. http://publications.aston.ac.uk/9710/.

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Common problems encountered in clinical sensing are those of non-biocompatibility, and slow response time of the device. The latter, also applying to chemical sensors, is possibly due to a lack of understanding of polymer support or membrane properties and hence failure to optimise membranes chosen for specific sensor applications. Hydrogels can be described as polymers which swell in water. In addition to this, the presence of water in the polymer matrix offers some control of biocompatibility. They thus provide a medium through which rapid transport of a sensed species to an incorporated rea
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30

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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31

Liu, Tongyu. "Fibre optic sensors for strain and temperature measurements in fibre reinforced composites." Thesis, Brunel University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266638.

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32

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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33

Khaliq, Sarfraz. "Fibre-optic long period gratings for sensing applications." Thesis, Cranfield University, 2003. http://dspace.lib.cranfield.ac.uk/handle/1826/7886.

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Long period gratings (LPGs) are formed by inducing a permanent periodic modulation of the refractive index (RI) of the core of an optical fibre. The transmission spectrum of the LPG contains a series of attenuation bands centered at discrete wavelengths. The exact form of the transmission spectrum and the central wavelengths of the attenuation bands, are sensitive to the period and the length of the LPG and to the local environment. The sensitivity of a LPG to a particular measurand is dependant upon the composition of the fibre and upon the order of the cladding mode to which the guided mo
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34

Casaubieilh, P. "Fibre optic fizeau intererometer for optical coherence tomography." Thesis, Cranfield University, 2006. http://dspace.lib.cranfield.ac.uk/handle/1826/5664.

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The aim of the project was to develop the Fizeau interferometer configuration to take advantage of the benefits derived from its “downlead insensitivity” to temperature and polarisation fading. This sensing interferometer was investigated and implemented in conjunction with various processing interferometers with the view to achieve optimised performances for Optical Coherence Tomography (OCT) application. A comprehensive theoretical analysis has been carried for Signal-to-Noise ratio of these OCT systems. Balanced detection indenting two detectors with anti-phase signals was also investigated
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35

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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36

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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37

Midgley, J. H. "The semiconductor laser applied to fibre optic sensors." Thesis, University of Kent, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304186.

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38

Mackintosh, James Macrae. "Rayleigh backscatter noise in the fibre optic gyroscope." Thesis, University of Strathclyde, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303353.

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39

Clark, Antony Harran. "GaInNAs devices and materials for fibre-optic communications." Thesis, University of Strathclyde, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426330.

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40

Maletras, Francois-Xavier. "Developments in fibre optic cardiac and respiratory plethysmography." Thesis, Kingston University, 2002. http://eprints.kingston.ac.uk/20700/.

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This work is the continuation of previous research by A. Raza and other contributors to the field of fibre optic plethysmography. Plethysmography is defined as the volume estimation of an object according to its external dimensions. fu particular, this technique can be used to produce an estimation of the respiratory volume of a human subject according to the dimension of his chest, measured at the thoracic and abdominal levels. A respiratory plethysmograph simply attempts to deliver a signal being the closest possible estimation of the true respiratory volume, as measured by a spirometer or a
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41

Cranch, Geoffrey Alan. "Large-scale remotely interrogated arrays of fibre-optic interferometric sensors and fibre lasers." Thesis, Heriot-Watt University, 2001. http://hdl.handle.net/10399/1197.

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The development of fibre-optic interferometric sensor arrays for application in underwater acoustics has been an area of active research since the late 1970's. The technology has reached a level whereby prototype arrays have been successfully demonstrated in sea-trials. However, the recent development of several new technologies may significantly increase the size and performance of these arrays. We demonstrate the potential increase in multiplexed array sizes using architectures based on combining dense wavelength division multiplexing and time division multiplexing. These architectures also
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42

Pratt, R. H. "Detection of magnetic fields using fibre optic interferrometric sensors." Thesis, University of Surrey, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355416.

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43

Sohlström, Hans. "Fibre Optic Magnetic Field Sensors Utilizing Iron Garnet Materials." Doctoral thesis, KTH, Signaler, sensorer och system, 1993. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-48332.

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This thesis deals with the subject of fibre optic magnetic field sensors utilizing iron garnet materials. Such materials exhibit a large Faraday rotation which make them advantageous for application in compact mag­netic field sensors. After an introduction, in which fibre optic sensors and optical methods to measure electric current are reviewed, the original research work is summarized. A system for the measurement of the magneto-optic properties of trans­parent materials is described. Measurement results, showing the influence of temperature, magnetic field direction and sample treatment on
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44

Gregoriou, Gregorios. "Precision determination of surface topography using fibre optic sensors." Thesis, Brunel University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295731.

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45

McBride, Roy. "Phase measurement and phase control in fibre-optic interferometers." Thesis, Heriot-Watt University, 1998. http://hdl.handle.net/10399/1219.

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46

Taplin, Stephen. "Measurement of thin oil films using fibre-optic interferometry." Thesis, University of Kent, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360976.

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47

Kerrouche, Abdelfateh. "Fibre Optic Distributed Sensors Systems for Structural Health Monitoring." Thesis, City University London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507411.

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48

Flannery, D. "Fibre optic chemical sensing using Langmuir-Blodgett overlay waveguides." Thesis, Cranfield University, 1998. http://dspace.lib.cranfield.ac.uk/handle/1826/10719.

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Fibre optic chemical sensing has been demonstrated using side-polished single mode optical bre, evanescently coupled to chemically sensitive Langmuir-Blodgett overlay waveguides. The sensors exhibit a channel dropping response centred on a wavelength dependent upon the thickness and refractive index of the overlay waveguide. It has been shown that chemically sensitive organic dyes prove to be suitable materials for forming the overlay waveguide whereas the Langmuir-Blodgett deposition technique provides the required overlay thickness control. A brief optic pH sensor has been demonstrated by de
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49

Ishaq, I. M. "Fibre-optic long period gratings with nano-structured overlays." Thesis, Cranfield University, 2006. http://dspace.lib.cranfield.ac.uk/handle/1826/10725.

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The influence of nano-structured overlays on the properties of fibre optic Long Period Gratings (LPGs) has been investigated. The presence of overlays of thickness of order 100 m is shown to significantly alter the response of the LPG to environmental parameters, such as the surrounding refractive index. A LPG with a nano-structured overlay was observed to exhibit enhanced sensitivity to refractive indices lower than silica, and was observed to exhibit sensitivity to refractive indices greater than that of the silica cladding, not observed in the absence of the overlay. A theoretical model pre
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50

Flannery, Damian. "Fibre optic chemical sensing using Langmuir-Blodgett overlay waveguides." Thesis, Cranfield University, 1998. http://dspace.lib.cranfield.ac.uk/handle/1826/10719.

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Fibre optic chemical sensing has been demonstrated using side-polished single mode optical bre, evanescently coupled to chemically sensitive Langmuir-Blodgett overlay waveguides. The sensors exhibit a channel dropping response centred on a wavelength dependent upon the thickness and refractive index of the overlay waveguide. It has been shown that chemically sensitive organic dyes prove to be suitable materials for forming the overlay waveguide whereas the Langmuir-Blodgett deposition technique provides the required overlay thickness control. A brief optic pH sensor has been demonstrated by de
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