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 18 of 18 for “"Optical fibre sensors"”.
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Optical fibre sensors and their interrogation
… in the fabrication and understanding of type IA fibre Bragg gratings, the uses of said gratings as optical sensors and the interrogation of optical sensors using tilted fibre Bragg gratings. This thesis presents the most detailed study of type IA gratings performed to date and provides the basis …
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Distributed optical-fibre sensors for monitoring mechanical strain and disturbance
… thesis reports work carried out to develop an optical sensor capable of detecting disturbance of optical fibre cables, for application in protection of telecommunications infrastructure. Initially, three types of sensor were investigated, however after preliminary experimental and theoretical …
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Distributed optical fibre sensors based on the coherent detection of spontaneous Brillouin scattering
… of a distributed temperature and strain optical fibre sensor based on the coherent detection of spontaneous Brillouin scattering. To further improve the sensing range and the sensor's performance, the use of Raman amplification was investigated utilising different Raman pump …
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Intensity based interrogation of optical fibre sensors for industrial automation and intrusion detection systems
In this study, the use of optical fibre sensors for intrusion detection and industrial automation systems has been demonstrated, with a particular focus on low cost, intensity-based, interrogation techniques. The use of optical fibre sensors for intrusion detection systems to secure residential, …
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Design and characterisation of long period grating (LPG) - based optical fibre sensors for acoustic wave detection
Fibre optic sensors have demonstrated a broad range of commercial potential due to their intrinsic characteristics such as low loss, very small size, light weight and immunity to electromagnetic interference. Representing one type of optical fibre sensors, long period gratings (LPGs) have shown a …
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Optical fibre refractive index, voltage and strain sensors : fabrication and applications
… is the study of intensity and wavelength-based optical fibre sensors (OFSs) for various applications in three major sensing areas: refractive index (RI), voltage and strain. The thesis aims to provide detailed information on the design and performance of particular intensity-based and …
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Distributed optical fibre smart sensors for acoustic sensing in the structural health monitoring of robust aerospace vehicles
The use of distributed optical fibre smart sensors for the detection of acoustic signals in the Structural Health Monitoring (SHM) of robust aerospace vehicles has been demonstrated. Current distributed optical fibre sensors are multiplexed along a single fibre. Inherent problems exist with a …
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Temperature measurement using rare earth doped fibre fluorescence
Optical fibre sensors have been developed to measure a wide range of parameters and in many circumstances show significant advantages over conventional measurement techniques. This thesis investigates a relatively new method of measuring temperature using optical fibres, known as the fluorescence …
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Exploitation of fibre characteristics in temperature sensing and radio-over-fibre applications
… advance in the development of microelectronic sensors, optical fibre sensors are widely investigated because of their advantageous properties over the electronics sensors such as their wavelength multiplexing capability and high sensitivity to temperature, pressure, strain, vibration and …
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Fibre optic sensor for speed measurement
… devices. There is however a demand for low-cost sensors capable of operating 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 …
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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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In-situ deformation monitoring of aerospace qualified composites with embedded improved draw tower fibre Bragg gratings
Aerospace certified fibre reinforced plastics (FRPs) are extreme performing construction materials, which today are increasingly applied in primary structures of the new generation aircrafts (e.g. Boeing 787, Airbus 350, Bombardier C-Series), such as the fuselage, the wings and the fin. An …
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In-situ cure monitoring of epoxy resin systems
… out at Brunel University to develop novel optical fibre sensors capable of monitoring the cure state of an epoxy/amine resin system. The sensors were of simple construction, consisting of an optical fibre from which the silicone cladding layer had been removed over a short length. This …
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Measurement of gas bubbles in a vertical water column using optical tomography.
… an investigation into the application of optical fibre sensors to a tomographic imaging system for use with gas/water mixtures. Several sensing techniques for measurement of two component flow using non-intrusive techniques are discussed and their relevance to tomographic applications …
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Optical fibre-based minimally-invasive blood glucose monitoring system.
… to have been developed and used. However, these sensors are problematic. They are invasive in nature and have bio-compatibility issues. Also, these electrochemical sensors are rendered unstable due to the electroactivity of other blood constituents, therefore requiring frequent recalibration. …
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Creation of novel gold-nanorod-based localized surface plasmon resonance biosensors
… localized surface plasmon resonance (LSPR) based sensors, this thesis reports the studies on the development of a novel sensitive gold nanorod (GNR) based label-free LSPR optical fibre biosensor, and the development of a novel robust method for effectively modifying the surface of cetyl-trimethyl …
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Experimental and theoretical analysis of polarization-maintaining fibre for sensing applications
Fibre optic sensors have been developed extensively over the past several decades, showing their potential and suitability for real-time measurement and thus meeting various industrial challenges. This has been achieved through the continuous innovation both in the fibre structural design and in …
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Design and Frabication of Optical Li+ Sensors for Application in Li-ion Batteries
… systematic underutilisation of battery systems. Optical techniques offer a potential solution to this problem owing to their low-cost, facile integration as part of commercial battery systems and their potential to monitor a range of mechanical, thermal, and chemical parameters through the …