Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 94 for “"fibre optic"”.
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Interrogation of fibre optic sensors
… 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 …
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Fibre optic sensor for speed measurement
… in potentially hazardous environments in which optical fibre sensors are more suited. In this thesis the development of a non-intrusive speed measurement sensor, based on optical technology is described. The optical fibre sensor described herein gives an almost instantaneous indication of the …
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A fibre optic based ranging sensor
… techniques have evolved from geometrical to bulk optical or radar methods. There is however a demand for low-cost short to medium range sensors, for operation in potentially hazardous environments, which may be satisfied by optical fibre based sensors. In this thesis the development of an optical …
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Modified Hydrogel Matrices in Fibre Optic Sensors
… leading to the design and construction of an optical sensor test bed. The development of suitable membrane systems and of suitable coating techniques in order to apply them to the fibre optics is described. Initial results obtained from hydrogel coatings implied that the refractive index …
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Developments in automating the design of fibre-optic cable
The design of optical fibre cables has for many years been a laborious manual task involving geometrical mathematics, a knowledge of materials, and past experience. The objectives of the work were to develop a series of design aids which would both automate the process of physical cable design and …
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Ultra-Wideband Fibre-Optic Systems in the Nonlinear Regime
… efficiency urgently need to be solved for optical fibre communication systems to enable the tremendous growth of Internet traffic. Optical communication networks are mainly limited by the power-dependent fibre nonlinearity which limits the capacity that can be achieved in such systems. This …
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Remote detection of laser generated ultrasonics by fibre optic interferometer
… with the development of a totally remote all-optic nondestructive testing and evaluation technique suitable for use in a range of adverse measuring environments. It differs from previous work in that the technique is made much more flexible and suitable for a greater range of measurement …
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FIBRE-OPTIC, MULTI-ACCESS NETWORK FOR INTRACAR AND MANUFACTURING ENVIRONMENTS
… solid media, this research focuses on how to use fibre optics for interconnection and therefore avoid both problems, electromagnetical interference and hard faults. From seven investigated optical transmission structures the optical rmg was chosen for implementation. Since the CAN protocol was …
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Fibre optic pressure sensor for downhole monitoring in the oil industry
… be 35% on average for North Sea oil-wells.<br/>Fibre-optic sensors have the potential to measure many downhole parameters. However, high-temperature, high-pressure (HTHP) fluids are shown to have adverse effects on fibre pressure-sensors and cables. All unprotected, silica-fibre, pressure …
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Fibre optic sensing techniques for the detection of lead (II) ions
… of two lead-sensitive reagents in different fibre optic sensing configurations. The reagents were carefully selected for their response towards lead. A probe was built for each reagent and a sensor system designed, constructed and tested with each probe followed by analysis of the …
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Low coherence fibre optic Fabry-Perot sensors suitable for multiplexed strain measurement
… investigation of the potential of low finesse in-fibre Fabry-Perot interferometer sensors for the measurement of strain. There are a number of areas of modern engineering applications where there is a need for an alternative to conventional resistive strain gauges; particularly where a number of …
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Magnetophotonic sensor systems for fibre-optic magnetic diagnostics in tokamak fusion reactors
… of high performance in adverse conditions, optical fibre sensors may be the most appropriate alternative measurement technology. However, in order to reap the benefits associated with fibre sensors - such as minimised wiring, serial multiplexing, and electrical and chemical passivity - a new …
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A fibre optic system for distributed temperature sensing based on raman scattering.
… profile along a power cable using the fibre optic Distributed Temperature Sensing (DTS) technology. Based on the temperature measured by a DTS system, real time condition monitoring of power cables can be achieved. In this thesis, there are three main research themes. 1. Develop a DTS …
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Fibre-optic borehole observations and numerical modelling of complex ice-sheet thermodynamics
… the pressure-melting point). I first present a fibre-optic data set from a 1,043 m deep borehole drilled to the base of the fast-moving (>500 m a‾¹) marine-terminating Sermeq Kujalleq (Store Glacier) at the western margin of the Greenland Ice Sheet. This reveals hitherto unappreciated complexity …
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Error analysis for distributed fibre optic sensing technology based on Brillouin scattering
… 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 …
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Distributed Fibre Optic Sensing to Assess Support Reactions and Behaviour of Composite Steel Bridges
… in this investigation involves using distributed fibre optic sensing (DFOS) strain measurements to estimate support reactions in beams through an experimental investigation that involved beam, model bridge, and field load tests. Five steel beams were instrumented with fibre optic sensors and …
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All-optical nonlinear signal processing devices and their applications within fibre-optic communication systems
… research into the development of a range of all-optical fibre based nonlinear devices for optical communication applications. The research can he divided into two main themes. The first concerns the use nf superstructured fibre Bragg grating technology together with fibre based nonlinear devices …
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Development and in-vitro evaluation of a potentially implantable fibre-optic glucose sensor probe
… system has been produced. Recent developments in fibre optic biosensor technology, suggested a possible route to achieves this goal. The work in this thesis presents the development and testing of such a sensor. The sensor presented in this thesis is based around a commercial fibre optic blood gas …
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Fibre optic monitoring and finite element analysis of well integrity in methane hydrate reservoirs
… experiments are carried out with a distributed fibre optic monitoring technique called Brillouin optical time domain reflectometry/analysis (BOTDR/A) on the strain development of laboratory-scale well specimens subjected to tensile and bending loading. The primary contributions of the present …
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Investigations towards the development of a novel multimodal fibre optic sensor for oil and gas applications.
… (EMI). Compared to electrical sensors, fibre optic sensors offer several advantages like immunity to EMI, electrical isolation, ability to operate in harsh environmental conditions and freedom from corrosion. Existing fibre optical sensors in the O&G industry, based on step index single …
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