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Dissertations / Theses on the topic 'QCM sensors'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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1

Peduru, Hewa Thamara Mangalika, and s3007291@student rmit edu au. "Development and evaluation of QCM sensors for the detection of influenza virus from clinical samples." RMIT University. Applied Science, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080516.160600.

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The Quartz crystal microbalance (QCM) is a very sensitive mass-detecting device which is based on changes in to the vibrational frequency of quartz crystals after adsorption of substances to a modified crystal surface. In this study a QCM-based biosensor was developed for the rapid diagnosis of influenza viruses and its suitability and limitations were compared with currently available diagnostic methods on 67 clinical samples (nasal washes) received during the 2005 Australian winter. The type-specific and conserved viral M1 proteins of both A/PR/8/34 and B/Lee/40 viruses were used to pre
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Weckman, Nicole Elizabeth. "Microfabricated acoustic sensors for the detection of biomolecules." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274899.

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MEMS (Microelectromechanical Systems) acoustic sensors are a promising platform for Point-of-Care biosensing. In particular, piezoelectrically driven acoustic sensors can provide fast results with high sensitivity, can be miniaturized and mass produced, and have the potential to be fully integrated with sample handling and electronics in handheld devices. Furthermore, they can be designed as multiplexed arrays to detect multiple biomarkers of interest in parallel. In order to develop a microfabricated biosensing platform, a specific and high affinity biodetection platform must be optimized, an
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Lee, Sang Hun. "Theoretical and Experimental Characterization of Time-Dependent Signatures of Acoustic Wave Based Biosensors." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11631.

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The object of this thesis research is to facilitate the appraisal and analysis of the signatures of the modern acoustic wave biosensors, as well as to improve the experimental methodology to enhance sensor performance. For this purpose, both theoretical characterization of acoustic wave sensor signatures and experimental studies for the most frequently used acoustic wave biosensors, the liquid phase QCM (quartz crystal microbalance) and the vapor phase SAW (surface acoustic wave) sensors, are presented. For the study of SAW vapor phase detection, the author fabricated different types of two-p
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Stubbs, Desmond Dion. "Development of an Acoustic Wave Based Biosensor for Vapor Phase Detection of Small Molecules." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/10412.

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For centuries scientific ingenuity and innovation have been influenced by Mother Natures perfect design. One of her more elusive designs is that of the sensory olfactory system, an array of highly sensitive receptors responsible for chemical vapor recognition. In the animal kingdom this ability is magnified among canines where ppt (parts per trillion) sensitivity values have been reported. Today, detection dogs are considered an essential part of the US drug and explosives detection schemes. However, growing concerns about their susceptibility to extraneous odors have inspired the development
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García, Narbón José Vicente. "Improved characterization systems for quartz crystal microbalance sensors: parallel capacitance compensation for variable damping conditions and integrated platform for high frequency sensors in high resolution applications." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/63249.

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[EN] Different electronic interfaces have been proposed to measure major parameters for the characterization of quartz crystal microbalance (QCM) during the last two decades. The measurement of the adequate parameters of the sensor for a specific application is very important, since an error in this measure can lead to an error in the interpretation of the results. The requirements of the system of characterization depend on the application. In this thesis we propose two characterization systems for two types of applications that involve the majority of sensor applications: 1) Characterization
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6

Zhang, Chen. "Piezoelectric-Based Gas Sensors for Harsh Environment Gas Component Monitoring." Thesis, University of North Texas, 2019. https://digital.library.unt.edu/ark:/67531/metadc1538769/.

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In this study, gas sensing systems that are based on piezoelectric smart material and structures are proposed, designed, developed, and tested, which are mainly aimed to address the temperature dependent CO2 gas sensing in a real environment. The state-of-the-art of gas sensing technologies are firstly reviewed and discussed for their pros and cons. The adsorption mechanisms including physisorption and chemisorption are subsequently investigated to characterize and provide solutions to various gas sensors. Particularly, a QCM based gas sensor and a C-axis inclined zigzag ZnO FBAR gas sensor ar
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7

Anderson, Henrik. "Development of Electroacoustic Sensors for Biomolecular Interaction Analysis." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-107211.

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8

El, Sabahy Julien. "Couches minces organo-siliciées déposées par PECVD pour la fonctionnalisation de capteurs de gaz." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI115/document.

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La détection de gaz est un enjeu de plus en plus important, aussi bien dans le domaine de la surveillance de la qualité de l’air -intérieur et extérieur- que dans le suivi de procédés. Cet enjeu est d’autant plus critique dans le cas des composés organiques volatiles (COVs) que leur impact sur la santé publique est avéré. Détecter et quantifier leur présence devient une problématique majeure et différentes solutions existent. L’une d’elles, basée sur le couplage d’une nano-poutre résonnante et d’une micro colonne de chromatographie, s’avère être une solution prometteuse. Ces deux dispositifs a
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9

Kumar, Abhishek. "Development, characterization and experimental validation of metallophthalocyanines based microsensors devoted to monocyclic aromatic hydrocarbon monitoring in air." Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22635/document.

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Résumé indisponible<br>This PhD work is dedicated to investigate potentialities of phthalocyanines materials to realize a Quartz Crystal Microbalance (QCM) sensor for Benzene, Toluene and Xylenes (BTX) detection in air. The goal is to develop a sensor-microsystem capable of measuring BTX concentrations quantitatively below the environmental guidelines with sufficient accuracy. To achieve these objectives, our strategies mainly focused on experimental works encompassing sensors realization, sensing material characterizations, development of gas-testing facility and sensor testing for different
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Fostock, Ziad. "QCM Sensor Chip : – Construction of plastic parts for injection molding." Thesis, KTH, Maskinkonstruktion (Inst.), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-100017.

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I augusti 2007 tillfrågades författaren av Attana AB om han kunde konstruera dennes QCM-sensorchip för formsprutning som en del av hans examensarbete inom industriell design. Examensarbetet innefattade de två plastdelarna som utgör hölget av sensorchipet. Ytterliggare skulle en ny konstruktionslösning som underlättar montering av sensorchipet föreslås, en given plats för identifikationsmärkning av sensorchipet skulle implementeras och den estetiska aspekten av designen skulle slutföras inom ramarna av arbetet. Arbetsprocessen innebar ett tvärdisciplinärt uppdrag som ingenjör, designer och proj
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11

Nilebäck, Erik. "A novel biotinylated surface designed for QCM-D applications." Thesis, Linköping University, Department of Physics, Chemistry and Biology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-19250.

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<p> </p><p>Control of protein immobilization at sensor surfaces is of great interest within various scientific fields, since it enables studies of specific biomolecular interactions. To achieve this, one must be able to immobilize proteins with retained native structure, while minimizing non-specific protein binding. The high affinity interaction between streptavidin (SA) and biotin is extensively used as a linker between a surface, where SA is immobilized, and the (biotinylated) molecule of interest. Self- assembled monolayers (SAMs) of poly- and oligo ethylene glycol (PEG and OEG) derivative
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12

Chen, George Y. "Optical microfiber sensors." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/386492/.

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The technology and applications of optical fibers have progressed very rapidly in recent years. Fiber-optic sensors have been commercially successful and well established in various industries from biomedical to defense. They exhibit many advantages over their electrical counterparts, including higher responsivity, higher detection bandwidth, higher temperature performance, better immunity to electromagnetic interference, all-dielectric composition, greater environmental ruggedness and distributed sensing capability. However, the physical dimensions and the minimum bend radius of the optical f
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13

Niggebaum, Alexander. "Towards mobile quantum sensors for gravity surveys." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6779/.

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Design and first characterisations of the mobile sensor head in the Gravity Gradient Technologies and Opportunities Programme (GGtop) are presented. The aim of the project is the development of a mobile gravity gradiometer and faces the challenge of condensing a normally lab filling experiment in a portable and robust package. A fibre network replaced free space optics light distribution and fibre based components free space equivalents. Although stable against misalignment, the systems performance is limited by polarization changes of the guided light which arise from birefringence fluctuatio
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Montagut, Ferizzola Yeison Javier. "Sistema Oscilador Mejorado para Aplicaciones de Microbalanza (QCM) en Medios Líquidos y Propuesta de un Nuevo Método de Caracterización para Biosensores Piezoeléctricos." Doctoral thesis, Universitat Politècnica de València, 2011. http://hdl.handle.net/10251/9688.

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La microbalanza de cristal de cuarzo (QCM) se usa como técnica alternativa de análisis químico, donde las aplicaciones dependen directamente de la sensibilidad del cristal. Por tanto, es el parámetro más importante que determina el uso de los cristales de cuarzo frente a otras técnicas. La ecuación de Sauerbrey, teóricamente relaciona la variación de la densidad de masa en la superficie del cristal con el cambio de la frecuencia y al mismo tiempo predice que la sensibilidad aumenta en la misma proporción que el cuadrado de la frecuencia fundamental de resonancia serie del cristal. Aumentar la
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15

Wei, Danming. "Low-Cost Quartz Crystal Microbalance System Platform Designed for Chemical Nanoparticle." TopSCHOLAR®, 2016. http://digitalcommons.wku.edu/theses/1635.

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QCM sensor is a response to a kind of broad spectrum, high sensitivity, and simple structure, low-cost detection device, and particularly its quality as a type of gas sensor is widely used. With the successful oscillation in liquid phase, QCM sensor has been involved in the application analytical chemistry, surface chemistry, biochemistry and environmental monitoring side and many other scientific fields. With sensitive surface film as the sensitive element, AT-cut quartz crystal as energy transducer components by changes of the relationship between mass of surface film and frequency of QCM se
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16

Geiger, Harald. "Quasi-distributed optical fibre strain sensors." Thesis, University of Southampton, 1995. https://eprints.soton.ac.uk/399104/.

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This thesis presents for the first time two complementary techniques to monitor the optical path length in optical fibre over both long and short sensing lengths. Both techniques may be used to measure the physical environment of the optical fibre, in particular strain and temperature, and are suitable for multiplexed operation. Signal-to-noise analysis shows that current optical time domain reflectometry (OTDR) systems do not fully exploit the spatial resolution theoretically available. A new OTDR technique exploits the theoretical findings to monitor the range of reflective markers in an opt
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17

Volanthen, Mark. "Multiplexed and distributed optical fibre sensors." Thesis, University of Southampton, 1997. https://eprints.soton.ac.uk/394567/.

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This thesis presents three novel optical fibre sensor systems which monitor optical path lengths. The systems have been used to measure strain in an optical fibre. All three systems make several measurements at different locations along a fibre, allowing the spatial distribution of a measurand to be obtained. For the first time, incoherent optical frequency domain reflectometry is used together with time division multiplexing to measure the optical path length of an array of fibre sections. Sensing sections are 5m long and are defined by broadband optical reflectors. A closed loop interrogatio
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18

Williams, Randolph. "Organic Vapor Sensing Using High Frequency Thickness Shear Mode Resonators." Scholar Commons, 2005. https://scholarcommons.usf.edu/etd/918.

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Thickness shear mode (TSM) sensors, also known as quartz crystal micro-balances (QCM) are a class of acoustic wave sensors that have been used for gas/vapor sensing. Fast and sensitive chemical vapor sensing, specifically of hydrocarbon vapors is an important application for these vapor sensors. The TSM sensors typically used have a lower sensitivity compared with other acoustic wave sensors. This thesis describes the development of high sensitivity organic vapor sensors using thin polymer film coatings on TSM devices. Commercially available AT-quartz TSM devices were milled leaving a thin qua
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19

Bruce, Thomas Allan. "Studies on semiconductor devices as gas and vapour sensors." Thesis, University of Greenwich, 1993. http://gala.gre.ac.uk/6119/.

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20

Hadeler, Oliver. "Distributed feedback fibre laser strain and temperature sensors." Thesis, University of Southampton, 2002. https://eprints.soton.ac.uk/46100/.

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This thesis presents the development of two new types of polarimetric distributed feedback (DFB) fibre laser sensors for simultaneous strain and temperature measurements. These fibre Bragg grating (FBG) based sensors offer strain and temperature measurement accuracies of ±0.3 - ±15 με and ±0.04 - ±0.2°C which are suitable for many applications. The main advantage of these DFB fibre laser sensors over other FBG based sensors is the simplicity of their interrogation system. The first type of sensor operates stably in a single longitudinal mode which splits into two orthogonally polarised modes.
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21

Edwards, Henry Owen. "A study of techniques for optical fibre sensors." Thesis, University of Southampton, 1991. https://eprints.soton.ac.uk/399484/.

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This thesis reports on work performed within the field of optical fibre sensors. The topics studied cover three main areas of sensor research; fibre-remoted gas detection, the optical actuation of a resonant quartz device, and the assessment of compound glasses and fibres for current measurement applications. The gas detection techniques described have the common advantage of highly-selective measurement, and are applied to a number of industrial and environmental gases. Selectivity is achieved by effectively monitoring the spectral overlap between the gas sample to be measured, and that of a
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22

Joshi, K. H. "Determining the quality of pasteurised and homogenised cow milk using microwave sensors." Thesis, Liverpool John Moores University, 2018. http://researchonline.ljmu.ac.uk/9350/.

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More than 6 billion people worldwide consume milk and milk products and this number is rapidly growing every year (FAO, 2015a), there are numerous occurrences where the milk quality was below acceptable standards causing severe health hazards among consumers including young children. The aim of this research work is to design and develop a novel, microwave spectroscopy, approach for determination of overall quality of milk. In particular, this quality determination of milk products was achieved by identification of deterioration or spoilage of milk over time, classification of the milk product
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23

Jenner, Robert Peter. "Investigation of the suitability of amorphous semiconductors as sensors for optical process tomography." Thesis, University of Greenwich, 2000. http://gala.gre.ac.uk/6199/.

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In this work, the suitability of amorphous semiconductors as hard field optical sensors for application in optical process tomography (OPT) has been established. Two amorphous semiconductors were selected for the study, these being amorphous arsenic triselenide (a-As 2 Se3) and hydrogenated amorphous silicon (a-Si:H). The a-As2Se3 device was a single layered structure of 60|Um thickness fabricated upon a 2mm thick cylindrical aluminium substrate. The a-Si:H device was a multi-layered structure of 27.1fim overall thickness fabricated upon a 4mm thick cylindrical aluminium substrate. 20mm 2 samp
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24

Selvaratnam, Thevapriya. "Optimization and characterization of a centrally functionalized quartz crystal microbalance sensor surface for Norovirus detection : Optimering och karakterisering av en centralt funktionaliserad kvartskristall mikrovåg sensoryta för norovirus detektion." Thesis, KTH, Skolan för teknik och hälsa (STH), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-172550.

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In this study a biosensor based on real time quartz crystal microbalance (QCM) monitoring is optimized and characterized for the application in the Norosensor. This biosensor is aimed to recognise, capture and amplify Norovirus (NoV). In an initial step a simplified bioassay was developed that focuses on the latter parts of the assay which consists of DNA-guided probing and amplification of the captured virus and includes the development of an amplification model assay directly to the functionalised crystal surface. A padlock probe with matching sequence to the conjugated oligonucleotide on th
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Hayward, Justin Peter William. "Distributed optical-fibre sensors for monitoring mechanical strain and disturbance." Thesis, University of Southampton, 2005. https://eprints.soton.ac.uk/46856/.

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This 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 work it was decided to concentrate on a novel coherent-optical time-domain reflectometer (C-OTDR). The operation of the C-OTDR has been investigated theoretically, using various models to describe coherent scattering in the optical fibre. The assumptions used in the models were applied to a numerical
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Voulazeris, Georgios. "Portable atom interferometry : investigation on magnetic shielding techniques for compact quantum sensors." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8231/.

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Focus of this thesis are the magnetic shielding aspects of a mobile atom interferometer, developed under the Gravity Gradient Technologies and Opportunities Programme (GGtop). This system has been used as a test bed for new compact technologies with the aim to perform outdoor gravity gradient measurements. A finite element analysis model was used for optimising magnetic shielding design, aiming to reach a field attenuation factor of the order of 103, by mu-metal. The research was extended to alternative shielding techniques with the intention to push current technology towards next generation
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Slováková, Kristína. "Studium ochranných vlastností fóliových a nánosovaných materiálů." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2009. http://www.nusl.cz/ntk/nusl-216474.

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The report deals with the study of the resistence of the nonporous polymer materiále against permeation of the selected TICs, with the analysis of the running difussion processes and utilization of the acquired results for the selection of suitable barrier materials for the protective means.
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Weld, Andrew Mark. "Optical diffraction-based silicon sensors for the detection of DNA sequences." Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/47762/.

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This thesis describes the design, fabrication and characterisation of diffraction-based sensors on silicon (100) substrates for the detection of complementary DNA sequences using colloidal gold labels. In-depth analysis of variations of DNA sequence within the human genome and association with diseases is expected to lead to personalised medical treatment. There is a great need for DNA analysis technologies and for techniques to determine whether sequence variations occur on the same chromosomal strand with applications in disease screening and diagnosis. Novel two-dimensional diffraction stru
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29

Hua, Ping. "Integrated optical fluorescence multi-sensor system." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/70934/.

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Research on fluorescence-based integrated optical immunoassay multisensing systems has gained growing interest in the last ten years. This is because the systems have the potential to simultaneously detect multiple analytes in a single measurement, and the techniques involved are fast, robust and cost-effective. Therefore they have the potential to replace conventional chromatographic techniques, as the monitoring systems for the rapid assessment of water or food samples. Other areas, such as clinical diagnostics or forensic science also have a demand for highly multiplexed analytical systems.
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Arab, Hassani Faezeh. "Resonant nano-electro-mechanical sensors for molecular mass-detection." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/336335/.

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This research is conducted as a part of EU FP7 project entitled NEMSIC (hybrid nanoelectro-mechanical/integrated circuit systems for sensing and power management applications) with project partners, EPFL, TU Delft, IMEC-NL, CEA-LETI, SCIPROM, IMEC-BE, Honeywell Romania, and HiQSCREEN. Nano-electro-mechanical (NEM) sensors are getting an increased interest because of their compatibility with “In-IC” integration, low power consumption and high sensitivity to applied force, external damping or additional mass. Today, commercial biosensors are developed based on mass-detection and electro-mechanic
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Niyompan, Anuson. "Fast-ion conducting glass and glass-ceramics for the pH sensor." Thesis, University of Warwick, 2002. http://wrap.warwick.ac.uk/98497/.

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Fast-ion conducting glasses of the compositions Na1+xM2-x/3SixP3-xOI2-2x3 (0≤ x ≤3), where M = Zr, Ti, were studied to determine their structural arrangement, physical properties and ionic conductivity. Glass samples were prepared using the conventional melt-quench method in the melting temperature range, 1550 °C to 1650 °C. Glass products were characterised by XRD, DTA, dilatometry and density measurement. Solid state MAS NMR experiments of three accessible nuclei, 23Na, 29Si and 31P were used to determine short-range order arrangement in the glasses. XRD confirms the amorphicity of glasses f
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Vargas-Rodríguez, Everardo. "Optical gas sensors based on correlation spectroscopy using a Fabry-Perot interferometer." Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/50199/.

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In this work we present an analysis of gas sensors based on correlation spectroscopy with a Fabry-Perot interferometer (FPI). In this technique the spectral FPI transmission fringe pattern is matched with ro-vibrational absorption lines. To produce the cross correlation principle the FPI fringe pattern must be shifted along the frequency axis. Hence as the spectral FPI fringes are equidistant and symmetric therefore the ro-vibrational absorption lines of the target molecule must be almost equidistant. Well resolved ro-vibrational lines with Lorentzian line shapes and with almost equidistant sp
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Alahbabi, Mohammed Nasser. "Distributed optical fibre sensors based on the coherent detection of spontaneous Brillouin scattering." Thesis, University of Southampton, 2005. https://eprints.soton.ac.uk/65508/.

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This thesis reports on the progress that has been made improving the sensing performance 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 configurations. Using frequency measurements only, a temperature resolution of 5 °C over a 150km sensing range with 50m spatial resolution was achieved using a counter-propagating Raman pump. Using co-propagating Raman pump the tempera
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Bonnet, Laetitia. "Synthèse de couches minces de polymères par dépôt chimique en phase vapeur par une polymérisation amorcée in-situ (iCVD) : mécanisme de croissance et application aux capteurs de gaz." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1258/document.

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La miniaturisation des composants microélectroniques est nécessaire pour des gains de coûts, de place ou de performance. Des capteurs de gaz, faciles d'utilisation (transportables et non encombrants) peuvent alors être envisagés et ouvrir la possibilité à la détection de certains gaz toxiques en très faible quantité (tels que les COV, composés organiques volatils) qui ne sont que trop peu détectés actuellement. Les performances d'un capteur de gaz sont en premier lieu liées à sa couche mince sensible qui permet la détection par interaction avec le gaz cible. Ces travaux se focalisent sur le dé
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Garcia, Eddie Enrique Sanjuanelo. "Método de índice de Qualidade (QIM) otimizado para aferição da vida útil da tilápia do Nilo (Oreochromis niloticus)." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/11/11141/tde-22042015-165103/.

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O objetivo desse estudo foi determinar a vida útil da tilápia do Nilo (Oreochromis niloticus) inteira armazenada em gelo, usando analises sensoriais (Método do Índice de Qualidade), físico-químicas (bases nitrogenadas voláteis totais - BNVT, sustâncias reativas ao ácido tiobarbitúrico - TBARS, pH, cor, textura e microbiológicas (microrganismos mesófilos e psicrotróficos). Uma equipe de sete provadores foi treinada durante sete sessões para avaliação sensorial de frescor em peixe cru e filés cozidos. Um esquema QIM foi otimizado para tilápia inteira e outro desenvolvido para filés cozidos, com
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Austin, Edward Alfred Denzil. "Studies of measurement techniques for indirect chemical sensing based on fluorescence spectroscopy and applications for fibre-optic sensors." Thesis, University of Southampton, 2002. https://eprints.soton.ac.uk/50196/.

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This thesis describes experimental and theoretical studies of interrogation systems for determining fluorescent decays of order a few microseconds. The studies have enabled optimised design of interrogators for sensing oxygen using a fluorescent polymerencapsulated ruthenium complex. Two basic interrogation methods were explored, using blue LED excitation. The Rapid Lifetime Detection (RLD) scheme, a fluorescence interrogation method based on direct interrogation of the decay curve following pulsed excitation was generalised, and a novel method for optimising measurement precision derived. The
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Franco, Leandro Rezende Franco. "Efeitos do meio na estrutura conformacional e eletrônica de moléculas com grupos aceitador-doador." Universidade Federal de Goiás, 2016. http://repositorio.bc.ufg.br/tede/handle/tede/5506.

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Submitted by Marlene Santos (marlene.bc.ufg@gmail.com) on 2016-04-20T18:45:25Z No. of bitstreams: 2 Dissertaçao - Leandro Rezende Franco- 2016.pdf: 12911790 bytes, checksum: 424add978f6ebc12f99143d7bb1c924f (MD5) license_rdf: 19874 bytes, checksum: 38cb62ef53e6f513db2fb7e337df6485 (MD5)<br>Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2016-04-25T14:29:50Z (GMT) No. of bitstreams: 2 Dissertaçao - Leandro Rezende Franco- 2016.pdf: 12911790 bytes, checksum: 424add978f6ebc12f99143d7bb1c924f (MD5) license_rdf: 19874 bytes, checksum: 38cb62ef53e6f513db2fb7e337df6485 (MD
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Masoudi, Ali. "Design and application of a distributed optical fibre dynamic strain sensor." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/375125/.

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Over the past two decades, distributed optical fibre sensors (DOFS) based on Brillouin and Raman scattering have been extensively studied. As a result, a wide range of distributed temperature and strain sensors with different sensing range and accuracy levels have been developed. However, due to the weak nature of Brillouin and Raman scattering, most of the research in this field has been focused on DC or quasi-DC measurement of temperature and strain. On the other hand, the Rayleigh-based DOFS which have been previously proposed are only able to detect dynamic disturbances along the sensing f
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Belal, Mohammad. "Development of a high spatial resolution temperature compensated distributed strain sensor." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/336260/.

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Optical fibre sensors have offered such unrivalled distributed sensing features that they continue to be successfully exploited in various industries for performing continuous measurements of the physical parameters, such as, temperature and strain. However, there arise certain conditions in engineering or materials manufacturing and characterisation environments, when the user seeks to extract the knowledge about a single physical parameter only, say strain, whilst the environment is also subject to temperature. This thesis explores techniques to offer solutions under such conditions by devel
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Russell, Stuart John. "Optical sensors for the location of buried optical cables and disturbances acting on extended lengths of optical fibre." Thesis, University of Southampton, 2000. https://eprints.soton.ac.uk/50195/.

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The work presented in this thesis, investigating two novel optical fibre sensor systems, was carried out as part of industrially sponsored (Radiodetection Ltd) and supported applied research project. The first sensor determines the longitudinal position of acoustic disturbances acting on an extended length of optical fibre cable and the second system locates the lateral position of a buried dielectrically-sheathed fibre cable. The second system is believed to be the first optically-based sensor for the location of buried fibre optic cables. An RF electromagnetic field, emitted from above the c
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Moore, Iain. "Single ion detection using FET based nano-sensors : a combined drift diffusion and Brownian dynamics 3D simulation study." Thesis, University of Glasgow, 2014. http://theses.gla.ac.uk/5136/.

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There is an ever increasing requirement for rapid sensing mechanisms for a variety of purposes – from blood analysis to gas detection. In order to allow large throughput, these devices must also be available at low cost per unit. One method which meets these criteria is the interfacing of biological and nano-scale semiconductor elements. Using modern CMOS processing, alongside further post processing, such devices can be created for a variety of purposes. However, development of these devices is expensive and in order to investigate possible structures, a simulation system is ideal. This work
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Haaksman, Ronald P. H. "Design of a fibre optic acoustic sensor array : sensitivity and noise properties." Thesis, University of Southampton, 2002. https://eprints.soton.ac.uk/15486/.

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In this thesis the study of a multiplexed Fibre Optic Acoustic Sensor (FOAS) system is presented. Narrowband reflectors (Fibre Bragg Gratings or FBGs) define sensing sections of 12.5 metres, which then act as Fabry-Perot (FP) cavities. Low-coherence interferometry is used to interrogate the sensors with an accuracy of 50 µrad/√Hz, in good agreement with the theoretically predicted value. Heterodyne signal processing is used to eliminate low frequency environmental noise. The performance of the sensor is checked by a sinusoidal calibration signal generated by a PZT fibre stretcher. The sensor h
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Leonardo, Ana Isabel Teixeira Figueira Amaral. "Estudo da qualidade do polvo-comum (O.vulgaris) capturado na baía de Cascais." Bachelor's thesis, Universidade Técnica de Lisboa. Faculdade de Medicina Veterinária, 2010. http://hdl.handle.net/10400.5/2185.

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Dissertação de Mestrado Integrado em Medicina Veterinária<br>A captura do polvo-comum (Octopus vulgaris) em Cascais tem importância económica por ser uma das espécies mais pescadas e ali vendidas. A segurança alimentar e a saúde humana dependem da qualidade e salubridade dos alimentos, tendo cada vez maior impacto na sociedade actual. Estas realidades associadas ao trabalho desenvolvido pela autora como Inspectora Sanitária na Lota de Cascais levaram à elaboração da presente dissertação. A análise sensorial é uma forma satisfatória de determinar o grau de frescura do pescado. Na UE o método
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Oo, Swe Zin. "Design, fabrication and optimization of large area chemical sensor based on Surface-Enhanced Raman Scattering (SERS) mechanism." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/383010/.

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In recent years there has been an increasing interest in analysis and identification of complex molecules for the medical diagnostics, pharmaceutical research and homeland security applications. If these molecules are present in high concentration, a technique known as Raman spectroscopy can be utilized. Unfortunately, only one in every 1012 photon incidence on molecule undergoes Raman scattering resulting in weak Raman absorption. An efficient technique to overcome this limitation is to utilize surface-enhanced Raman scattering (SERS) whereby molecules are placed on the surface of nanostructu
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Vural, Aydin. "Precise Height Estimation By Differential Amplitude Measurement For An Airborne Cw Doppler Proximity Sensor." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614956/index.pdf.

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Airborne CW doppler proximity sensors are very sensitive, but leaks precise height measurement. It may be possible to estimate the heigth at the terminal phase (the case where the sensor is at a heigth close to ground) precisely by using the doppler shift and amplitude information. The thesis includes this novel concept with theoritical analysis and simulation results.
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Crawford, Ted, Roger Bracht, Richard Johnson, and Barry Mclaughlin. "High Explosive Radio Telemetry System." International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/607361.

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International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California<br>This paper overviews the High Explosive Radio Telemetry (HERT) system, under co-development by Los Alamos National Laboratories and AlliedSignal Federal Manufacturing & Technologies. This telemetry system is designed to measure the initial performance of an explosive package under flight environment conditions, transmitting data from up to 64 sensors. It features high speed, accurate time resolution (10 ns) and has the ability to complete tr
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Muhammad, Haseena Bashir. "Development of a bio-inspired MEMS based tactile sensor array for an artificial finger." Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3259/.

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In this thesis, the design, fabrication and characterisation of a bio-inspired microelectromechanical systems (MEMS) based tactile sensor array is presented. A vast amount of research has been carried out in the area of tactile sensing and various transduction methods have been explored. However, currently no device exists with a performance comparable to that of the biological tactile sensors of the human fingertip in terms of robustness, sensitivity, spatial resolution and dynamic performance. The sensors developed in this work employ the principles of electrical capacitance and are fabricat
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Azzi, Victor, and Victor Azzi. ""Sensor-in-fibre" optical probes for molecular sensing in the gastrointestinal tract of murine models." Master's thesis, Université Laval, 2019. http://hdl.handle.net/20.500.11794/37631.

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L’obésité et les maladies cardiométaboliques sont des problèmes de santé publique dans les populations nordiques du Canada ainsi qu’à travers le monde. Il est actuellement proposé que l’augmentation de ces désordres est en partie causée par divers facteurs environnementaux qui génèrent des changements importants du microbiote intestinal. Cette communauté microbienne qui peuple notre tractus gastrointestinal joue un rôle clé dans le métabolisme de nutriments, mais peut aussi avoir des effets néfastes lorsque son équilibre avec l’hôte est perturbé. Cette compréhension a mis en évidence le manque
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Keysan, Ozan. "A Non-invasive Speed And Position Sensor For Induction Machines Using External Search Coils." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610290/index.pdf.

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In industrial drives market, speed and position estimation are one of the most important subjects for accurate motor drives. Vector controlled drives has the best dynamic performance among AC motor drives. Sensorless vector control is one of the most studied one. However, sensorless drive systems fail at low or zero speeds and may not have enough accuracy. For better accuracy and speed range speed sensors or position encoders are usually essential. However, coupling of sensor and sensor prices introduces extra cost on the drive. Thus in order to reduce the cost of the drive a cheap and easy to
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Wünnenberg, Anke Kristina. "Untersuchungen zur saisonalen Abhängigkeit der Haltbarkeit von Zuchtforellen (Oncorhynchus mykiss) während der Eislagerung mittels der Qualitäts-Index-Methode (QIM) an Ganzfisch und der Sensorik gegarter Filetproben /." Berlin : Mbv, 2008. http://d-nb.info/992998425/04.

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