Yu, Tsz Tat. / "December 2010." / Thesis (M.Phil.)--Chinese University of Hong Kong, 2011. / Includes bibliographical references (leaves 143-147). / Abstracts in English and Chinese. / Abstract --- p.2 / 摘要 --- p.4 / Acknowledgements --- p.5 / List of Figures --- p.6 / List of Tables --- p.12 / List of Abbreviations --- p.13 / Table of Contents --- p.14 / Chapter Chapter 1 --- Introduction --- p.17 / Chapter Chapter 2 --- Literature Review / Chapter 2.1 --- Surface Plasmon Wave --- p.19 / Chapter 2.2 --- Excitation of Surface Plasmon --- p.23 / Chapter 2.3 --- Surface Plasmon Coupling --- p.24 / Chapter 2.4 --- Surface Plasmon Resonance Detection Techniques --- p.33 / Chapter 2.5 --- Applications of SPR biosensors --- p.39 / Chapter Chapter 3 --- Theory of irradiance modulator / Chapter 3.1 --- Polarization --- p.44 / Chapter 3.2 --- Optical polarizer --- p.45 / Chapter 3.3 --- Liquid Crystal Modulator --- p.49 / Chapter 3.4 --- Irradiance Modulator --- p.52 / Chapter Chapter 4 --- LCM characterization / Chapter 4.1 --- Single LCM Transmittance driven by pure square wave --- p.66 / Chapter 4.2 --- Single LCM Reflectance driven by 50:50 STAM wave --- p.70 / Chapter 4.3 --- Multiple LCMs Reflectance driven by 90:10 STAM wave --- p.73 / Chapter Chapter 5 --- Background of phase measurement / Chapter 5.1 --- From holography to shearography --- p.77 / Chapter 5.2 --- From static Mach-Zehnder interferometer to differential-phase Mach-ZehnderZ interferometer --- p.81 / Chapter 5.3 --- From differential-phase imaging to pixel-referencing imaging --- p.86 / Chapter Chapter 6 --- Pixel-referencing data processing / Chapter 6.1 --- Background --- p.89 / Chapter 6.2 --- Procedures --- p.94 / Chapter 6.3 --- Experimental results --- p.98 / Chapter 6.4 --- Sensor resolution --- p.116 / Chapter 6.5 --- Performance comparison between single-beam LCM and Mach Zehnder configuration --- p.119 / Chapter Chapter 7 --- Discussions / Chapter 7.1 --- Experiment precautions --- p.136 / Chapter 7.2 --- Linear curve fitting --- p.137 / Chapter 7.3 --- Hardware limitation: Low frame rate --- p.138 / Chapter 7.4 --- Matching oil and glass slide --- p.139 / Chapter Chapter 8. --- Conclusions --- p.141 / References --- p.143 / Appendix / Chapter A1 --- "Concentration, Refractive Index and Dielectric constant of Sodium Chloride Solution (20°C)" --- p.148 / Chapter A2 --- Liquid Crystal Modulator Specification --- p.149 / Chapter A3 --- "Digital-to-analogue Converter Device (NI, PCI6036E) Datasheet" --- p.150 / Chapter A4 --- "CCD Camera (Lumenera, Infinity) Datasheet" --- p.151 / Chapter A5 --- Flow chart of SPR phase extraction --- p.152 / Chapter A6 --- Codes of SPR phase extraction in modules --- p.153

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This thesis addresses the hypothesis that unobtrusive monitoring of daily living could be used to evaluate changes in the health status of frail elderly people living alone at home. Low cost motion sensors can be used for monitoring the long term trends in occupant?s well-being in terms of physical, mental, social and environmental factors. The monitored data can be used to quantitatively measure parameters that can provide insight into the level of activity and functional ability of the subject. Any deviations in these parameters can provide information on the changing health status of the subject. This thesis attempts for the first time to establish a mathematical and statistical framework for the monitoring of functional health status in the home using a network of wireless sensors to monitor occupancy in each room of the house. A low power and low cost, unobtrusive occupancy monitoring system using ZigBee wireless technology and passive infrared sensors has been developed by the Biomedical Systems Laboratory at the University of New South Wales. The essence of the occupancy monitoring system is to detect variations in the activities of daily living (ADL) of elderly people living alone at home. The finite state, discrete parameter, time homogeneous Markov chain represents a theoretical framework for an unobtrusive occupancy monitoring system. An implementation of this framework for monitoring occupancy pattern is presented in real time use. The system was evaluated in a series of field studies in laboratory and home environment, in supervised and unsupervised settings, using cohorts of healthy elderly subjects living alone in their homes in community dwelling setting. A pilot trial was conducted in which four healthy elderly subjects living alone had PIR motion sensors installed in their homes at strategic points for a period of up to 13 weeks. The functionality of the system was evaluated over a domain of basic daily activities. A profile of the activities, in real time environment, for different times and days was stored as transition probability matrices. Automatic techniques for interpreting the test data captured by the system in terms of human movements were evaluated and compared with the wellness profile of the subject. Trial results exhibited that clinically significant model parameters were able to detect longitudinal deviations in the functional health status of elderly people.

The effect of Intra-pixel sensitivity variation (IPSV) in charge-coupled devices (CCDs) can be important in astronomical applications. This thesis studies the IPSV in a front-illuminated three-phase EEV05-20 CCD used in the Automated Patrol Telescope (APT), from multiple points of view. To explore the detailed sensitivity variation within pixels, the CCD was scanned using a 4 \mu meter diameter light beam in four colour bands: B, V, R and I. The resulting images clearly show the IPSVs due to the CCD electrode structure, and its dependence on wavelength. Unexpected ghost images appear in the scan images that are most likely due to the charge transfer inefficiency (CTI) of the CCD. A correction procedure for the CTI effect is presented. Using the pixel response function (PRF) which was derived from the CCD scans, instrumental point spread functions (iPSFs) were calculated from dithered images observed by the APT. The accurate iPSFs allowed us to generate a variety of simulated images of APT observations, enabling us to analyse in detail the effect of IPSV on astronomical observations. One of the astronomical impacts of IPSV is on photometry. The IPSV effect on the precision for estimating star fluxes was studied using both observed and simulated images. The IPSV effect can be expressed as magnitude estimation error maps plotted against the fractional part of a star's coordinates. The IPSV effect introduces \pm 4% errors in star fluxes for observed images with the APT in V band. Another astronomical impact of IPSV is on astrometry. IPSV influences the precision for estimating star coordinates, and this was studied using a number of simulated images. The IPSV effect can be expressed as coordinate estimation error maps plotted against the fractional part of a star's coordinates. The IPSV effect introduces \sim 0.02 pixel errors in RMS for images observed with the APT in V band. The appearance of the unexpected ghost images in the CCD scans suggested that CTI might also affect observed images. We examined the effects on PSFs and photometry. The CTI effect does affect the shapes of PSFs, but only to a small fraction. Its effect on photometry is negligible.

Cette thèse cofinancée par le CNRS et Framatome a porté sur l'étude d'une cavité supraconductrice de type spoke et de son coupleur de puissance associé. Les résultats ont été utilisés dans le cadre du 5ème PCRD et notamment pour l'accélérateur linéaire de protons de forte intensité(6mA) du projet de réacteur hybride XADS. La cavité (F=352MHz, BETA=0.35) a été testée à 4K et 2K. Ses performances à 4K donnent des marges confortables par rapport au cahier des charges XADS, ce qui est utile pour la fiabilité de l'installation. A 2K le champ accélérateur maximum est de 16MV/M ce qui est une référence mondiale.Le port de couplage de la cavité a été optimisé : sa position et son diamètre ont été modifiés pour diminuer les pertes HF sur l'antenne et limiter les risques de multipacting. Pour minimiser les pertes HF le mode de couplage avec la cavité choisie est électrique.Différents types de fenêtre céramique ont été étudiés afin de rendre fiable ce point critique du coupleur : disques coaxiaux avec ou sans chokes ou cylindrique creux coaxial . L'optimisation a porté sur la puissance réfléchie, les pertes dans la céramique, et le champ électrique de surface. Le disque muni de choke a également été modélisé et a fait l'objet d'une étude grâce à la théorie des lignes. L'ensemble des fenêtres a été étudié de manière systématique en fonction de différents paramètres géométriques. Le disque sans chokes semble un bon candidat pour notre application. La source de puissance sera un amplificateur état solide. Un coupleur entièrement coaxial est réalisable et sera fabriqué et testé prochainement.

Fiber Bragg grating sensors have been constantly researched for the last ten years and have finally begun to find use in the commercial market. However, one of the major factors limiting their widespread use is their system cost. Their lightweight, flexibility, electromagnetic immunity, and small size make fiber Bragg grating (FBG) sensors feasible in hostile environments where electrical and mechanical sensors may not function effectively. These sensor systems utilize moderately expensive light sources and detectors at telecommunication wavelengths of 1300 nm and 1550 nm. These are the center wavelengths of the mass-produced FBGs and FBG phase masks. This thesis addresses the development of a lower cost short wavelength fiber Bragg grating strain sensor system using gratings written at 790 nm and 850 nm with the modified phase mask method recently developed at Oregon State University. Short wavelength gratings allow the use of less expensive semiconductor sources and silicon detectors, greatly reducing the overall cost of a strain sensor system from approximately $1600 for a 1300 nm system to $1000 for a 790 nm system. First, the fundamental properties and historical background of fiber Bragg gratings were reviewed. Followed by a literature review of the structures, fabrication methods, and applications of FBGs including sensor applications. The design, manufacture, and assembly of the new short wavelength strain sensor system were described including the production of pigtailed super-luminescent edge emitting light emitting diodes (SELED) from commercial laser diodes, a fiber recoater, and multiple attempts to write a fiber Bragg grating in the 750-850 nm wavelength region. Finally, the short wavelength strain sensor system was compared with a 1300 nm strain sensor detailing the potential cost savings with the short wavelength system. / Graduation date: 2003

A comparison of two novel demodulators. The first is a basic zero crossing demodulator, as introduced by Beards. The second is an approach proposed by Hovin. The two demodulators are compared to each other and to the conventional method of demodulation. / Graduation date: 1998

An oscillating plasma glow discharge detector for gas chromatography is used to obtain fingerprint information about an analyte by combining both the average cell current and oscillation frequency signals. Five homologs each of the n-alkanes, 1-alkenes, 1-alkynes, 2-ketones and aldehydes are studied. Although triplicate determinations had some scatter due to noise, they showed clustering that allows several of these compounds to be distinguished from the others by using a two-dimensional plot of the ratios of frequency peak area to current peak area and frequency peak height to current peak height. Fingerprint identification information is improved by changing the cell pressure, applied voltage and electrode spacing. Changes in the discharge operating conditions produce changes in the analyte peak responses. The relative magnitudes of the analyte current and frequency peak responses also change with respect to each other under different discharge conditions. Unique fingerprints or patterns of responses are created for each analyte by changing the discharge operating conditions. The detector responses toward 10 organic compounds, representing seven different functional groups, are recorded under 56 different combinations of discharge conditions. The ratios of the frequency to current peak responses (heights and areas) for three of the 56 sets of conditions investigated provide enough information to distinguish between nine compounds. Principal component analysis and hierarchical cluster analysis, multivariate exploratory techniques, are used to observe natural clustering in the data. / Graduation date: 1994

Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, September 1997. / Thesis Advisor(s): Murali Tummala. "September 1997." Includes bibliographical references (p. 61-62). Also available in print.

Thesis (Ph.D.)--University of Delaware, 2006. / Principal faculty advisor: Busby N. O. Attoh-Okine, Dept. of Civil & Environmental Engineering. Includes bibliographical references.