Browsing University of Galway Theses by Subject "Physics"
Now showing items 1-20 of 83
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4D light field reconstruction and scene depth estimation from plenoptic camera raw images
(2016-05-16)Microlens-array-based light-field cameras (also known as plenoptic cameras), which are capable of recording both angular and spatial information of light, are already commercially available as consumer commodities. Due to ... -
Accurate patient dosimetry in modern computed tomography systems
(NUI Galway, 2020-10-21)The most common parameter used to estimate and minimise patient dose in computed tomography (CT) is the CT dose index (CTDI). The CTDI is the average absorbed dose from a series of contiguous irradiations along the long ... -
Advancements in structural and functional imaging using Fourier domain optical coherence tomography
(NUI Galway, 2020-07-29)Optical Coherence Tomography (OCT) is a non-invasive optical imaging modality based on low coherence interferometry that enables high resolution, cross sectional imaging in biological tissues and materials. One major ... -
Aerosols and the imaging atmospheric Cherenkov technique
(2018-02-22)The ability to extract energetic γ-rays from the overwhelming high energy cosmic ray back- ground has opened up a new window of observation on the non-thermal universe. By utilis- ing an atmospheric technique VERITAS, an ... -
Air to sea gas exchange of CO2 in the north-east Atlantic Ocean
(2011-12-08)Atmospheric carbon dioxide concentrations have been rising for the past 200 years, and started increasing at a faster rate during the last 60 years. The world's oceans act as a reservoir for large amounts of CO_2. How they ... -
Analysis of EMCCD gain estimation techniques for use in astronomical instruments
(NUI Galway, 2023-09-14)Electron-multiplied Charge Coupled Devices (EMCCDs) are used in many astro nomical instruments where they provide much improved signal to noise compared to conventional CCDs. However, the gain provided by electron-multiplication ... -
Aplanatic lens correctors for imaging optics
(NUI Galway, 2022-09-05)This thesis proposes analytically developed aplanatic field correctors. To begin, an astigmatism correction method for aplanatic Gregorian telescopes was developed employing two lenses with spherical surfaces and a ... -
Application of flow cytometry and membrane inlet mass spectrometry as tools to assess dimethyl sulfide produced in emiliania huxleyi (CHC108) cultures
(NUI Galway, 2023-12-04)Dimethyl sulphide (DMS) is a key component in the global sulphur cycle with emphasized significance in areas away from anthropogenic sources. Phytoplankton produce DMS when under stress as a defence mechanism from ... -
Astronomy education in secondary school: An evaluation of conceptual and affective learning experiences with game-based learning
(NUI Galway, 2021-07-14)The study of our universe has been inspiring humankind for thousands of years. The effective teaching of astronomy has been one of the longstanding pillars of worldwide civilization, but new technologies afford new ... -
Carbonization of polyimide using CO2 laser and femtosecond laser for sensor applications
(NUI Galway, 2023-10-05)Laser carbonization is the process of photothermal conversion of polymers rich in aromatic carbons such as Polyimide (PI) into graphene, via a process called Laser Induced Graphene (LIG) using a laser as the source of ... -
Characterising occupational exposure to glyphosate among amenity horticulturists
(NUI Galway, 2018-12-19)A dearth of knowledge exists regarding occupational glyphosate exposures among amenity horticulturalists. Glyphosate is the highest volume herbicide used globally, and has recently been classified by the International ... -
Chemical nature and sources of particulate matter in urban areas
(NUI Galway, 2019-05-07)Particulate matter (PM) air pollution adversely affects human health and can lead to premature deaths. The sources of air pollution, however, remain poorly understood especially in urban areas with intense human activities. ... -
Computational development of a particle-In-cell computer code for the simulation of plasma Instabilities around rotation powered pulsars
(2014-09-03)This thesis reports on the design and development of DYMPHNA3D, a 3D particle-in-cell (PIC) plasma simulation code. It also focuses on the field of radio emission and the discovery of rotation powered neutron stars, ... -
Decoding the kinematic and ionisation structure of axisymmetric nebulae
(NUI Galway, 2021-08-04)The aim of the thesis was to develop a code and pipeline for generating 3D photoionisation models of axisymmetric nebulae to better understand their ob- served structure and composition. This was achieved through a new ... -
Depth of field reduction for miniature-camera imaging
(NUI Galway, 2020-08-25)This thesis investigates the reduction of depth-of- field for miniature camera systems, such as the ones embedded in smartphones. The work on digital shallow depth-of- field is already mature and implemented in most modern ... -
Detection of faint exoplanets in multispectral data
(NUI Galway, 2019-04-15)The detection of extrasolar planets is extremely difficult due to their extreme faintness and proximity to their parent stars. Direct, ground-based detection is particularly challenging and despite the incredible contrast ... -
Development and applications of optical imaging techniques for microcirculation and cardiovascular imaging
(2016-08-12)The work presented in this thesis describes the development and applications of optical imaging techniques, optical coherence tomography (OCT) and photoacoustic (PA) imaging, for the purpose of diagnosing and treating ... -
Development and evaluation of platform-based SERS substrates for detecting cancer biomarkers at ultra-low concentrations
(2017-04-27)Surface Enhanced Raman Scattering (SERS) has proved to be a powerful spectroscopic tool since its discovery in 1973. Advances in nanofabrication techniques increasingly allow for the manufacture of complex nanostructured ... -
Development and Implementation of an Ultra High Speed Astronomical Polarimeter: The Galway Astronomical Stokes Polarimeter (GASP)
(2013-05-12)Optical polarization is a powerful diagnostic tool in astrophysics, allowing the investigation of asymmetries in source regions of astronomical objects, magnetic field configurations, and magnetic field strengths. Polarized ... -
Development of a high time resolution optical polarimeter for astronomy
(NUI Galway, 2018-12-17)This work started in September, 2014 and initially started as an investigation of the characterisation issues associated with using Electron Multiplying Charge- Coupled Devices (EMCCDs) in a two beam polarimeter. It was ...