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 24 for “"Fibre optics"”.
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The integration of fibre optics for atom chips
… on the progress made towards the integration of fibre optics components for the atom chip, a device developed to manipulate matter on the atomic scale for the purpose of quantum information processing, novel applications, and fundamental research. Following in the direction of the electronics …
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Pollutant monitoring with fibre optics in the deep ultraviolet
… carried out in the development of ultraviolet fibre-optic based absorption sensor systems, including those with the newly available ultraviolet improved silica fibres having low attenuation in the 200 nm to 250 nm wavelength region. Several approaches to optimize the optical design of such …
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The emergence of the network supply-chain: a study of co-operation and performance in supply-chain relationships in the UK fibre-optics industry
This study focuses on the emergence of a new governance form, the network supplychain, in the UK optical communications systems industry. In doing so, it pursues two objectives. The first is to investigate the extent of the shift from market-oriented to co-operation oriented mechanisms in governing …
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Applications of Distributed Temperature Sensing in Subsurface Hydrology
… small intervals, and over large distances along fibre optic cables. The capability of DTS in conjunction with heat injection to detect groundwater fluxes, is assessed in this thesis using a combination of numerical modelling, laboratory tests, and field trials at the Ploemeur research site in …
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Remote detection of laser generated ultrasonics by fibre optic interferometer
… range of measurement environments by the use of fibre optics. There is little problem in using optical fibres for delivery of high power Q-switched pulses to excite acoustic waves in target materials. However, the use of fibre optic interferometers in remote detection of these pulses presents …
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Serial digital multiplexing of transducer data for intrinsically safe applications
The galvanic isolation of fibre optic transmission offers a distinct advantage in the design of a telemetry system to meet intrinsic safety requirements. So far the usage of fibre optics in instrumentation systems has been largely confined to the implementation of point to point links due to the …
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Design of a wireless ureteropyeloscope
… existing instruments. Current endoscopes use fibre-optics for lighting area of interest as well as image acquisition. However, the ureteropyeloscope discussed was developed with a camera at the distal end of the insertion tube as its image acquisition system. The images captured were …
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High Resolution Distributed Sensing Using Exposed-Core Fibres
Distributed fibre sensors were proposed more than 40 years ago, with their primary applications in physical sensing for civil infrastructure monitoring. Based on optical frequency domain reflectometry (OFDR), this thesis extends distributed sensing to biomedical applications, with a focus on the …
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Modified Hydrogel Matrices in Fibre Optic Sensors
… coating techniques in order to apply them to the fibre optics is described. Initial results obtained from hydrogel coatings implied that the refractive index change in the polymer matrix, due to a change in water content with pH is the major factor contributing to the sensor response. However the …
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Mid-Infrared Integrated Devices for Optical Chemical Sensing
… other technologies, such as microfluidics and fibre-optics. Firstly, fibre-optic integrated microfluidic devices were developed and tested for con- tinuous fluid monitoring. These showed good sensing capabilities for online, continuous and real-time liquid sensing in hard-to-reach locations. …
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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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Micro cameras as adjunct tools in biomedical applications
… of various devices, along with multi-spectral fibre illumination, automated readout, control, and image processing; into a compact format suitable for clinical use. The technology is then applied to a number of applications, with the system tailored to the specific use cases. The verification …
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Synergic control in MIG welding and penetration control in TIG welding
… regulating pulse current period, by means of a fibre optics image guide/video camera/microcomputer based controller. The system has been found to be capable of controlling the weld bead penetration uniformly in stainless steel plates and joints, for constant as well as variable material …
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Advanced Raman spectroscopy for bioprocess monitoring
… typically laser, a Raman probe with optical fibres, a spectrograph and a detector which is connected to a measurement- and control PC. Raman spectroscopy is increasingly becoming a choice as analytical tool in bioanalytics. Most of biological samples are handled in aqueous form which …
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The non-invasive quantification of cutaneous haemoglobin and its oxygenation by reflectance spectrophotometry
… lamp is transmitted to the reflectance probe by fibre optics and illuminates the skin surface perpendicularly. The diffuse reflected light is then collected and transmitted to a rotating circular variable filter, CVF. The CVF is driven by a BBC Microcomputer and the spectrum from 356 to 721 nm is …
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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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Quantum key distribution beyond the repeaterless secret key capacity
… and the protocol is implemented over real fibre channels exceeding 600 km in length, representing the first fibre-based secure quantum communication beyond the barriers of 600 km and 100 dB. In both cases, in the high loss/distance regime, the resulting secure key rates exceed the …
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Characterization of Optical Coupling and Back-reflection of Few Mode Fibers
… of approximately 10dB were achieved depending on fibre type and proximal face. Suggestions for extensions to further improve the SBCR as well as for applications of this system are discussed.
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Operando fibre Raman sensors for Li-ion battery chemistry
… sensors non-trivial. Combining optical fibres and spectroscopy provides a chemically sensitive sensor that can be embedded directly into the battery with minimal disturbance to the cell operation. This thesis aims to develop and characterise an operando fibre-optic Raman probe, enhanced …
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Operating Regimes and Automated Control of Holmium and Thulium Non-linear Polarisation Rotation Mode-locked Fibre Optic Lasers
Mode-locked fibre lasers have applications in research, defence, biological science, manufacturing and spectroscopy. The aim of this research was to investigate auto- matic control of a passive mode-locking technique known as non-linear polarisation rotation (NLPR) that exploits polarisation …
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