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 17 of 17 for “"Diffraction imaging"”.
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Sub-Diffraction Imaging using Superoscillatory Electromagnetic Waves
This thesis presents an investigation on imaging beyond the diffraction limit with superoscillatory electromagnetic waves. It begins with a survey on sub-diffraction imaging, which motivates the need for a new sub-diffraction imaging device which is free from drawbacks in devices which have …
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PROFILING EFFUSION CELLS BY QUANTITATIVE ANALYSIS OF MORPHOLOGY AND DIFFRACTION IMAGING PATTERNS
… of a label-free method of polarization diffraction imaging flow cytometry (p-DIFC) for quantitative profiling of cell morphology in PPE samples and their correlations to the texture features of cross-polarized diffraction image (p-DI) pairs. To establish the morphology implications of …
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Bragg Coherent Diffraction Imaging of Metal Microcrystals Using a Multipurpose In Situ Cell Design
… reactor-relevant conditions. Bragg coherent diffraction imaging (BCDI), a synchrotron X-ray technique, enables high-resolution 3D imaging of degradation processes. Combined with an experimental electrochemical cell, BCDI is a promising tool for providing insight into the problems facing …
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Development of X-ray Fan Beam Coded Aperture Diffraction Imaging for Improving Breast Cancer Diagnostics
<p>X-ray imaging technology has been used for a multitude of medical applications over the years. The typically measured X-ray transmission data, which records shape and density information by measuring the differences in X-ray attenuation throughout a material, have been used in the imaging …
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Stresses and strain in silicon: 3-dimensional analytical capabilities for the non-invasive evaluation of strain fields in Si wafers and packaged chips
… thesis proposes novel techniques for the in situ imaging of strain and internal damage in processed Si wafers and packaged Si chips. X-Ray Diffraction Imaging (XRDI) is a powerful, non-destructive technique for the imaging of strain in crystalline materials. Traditionally, section transmission …
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Strain in Halide Perovskites: Characterisation, Crystallography, Consequences
… I make use of a range of synchrotron-based X-ray diffraction techniques to characterise strain in halide perovskites. As introduced in Chapters 2 & 3, this crystallographic approach is combined with photoluminescence (PL) measurements as a probe of optoelectronic performance with the view to …
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From bits to information : learning meets compressive sensing
… in X-ray crystallography and super-resolution diffraction imaging applications. Our analysis of quantization based algorithms highlights interesting tradeoffs between memory complexity, sample complexity, and time complexity in algorithms design.
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Synthesis, Structure and Transport Properties of New Lanthanum-based Ternary Hydrides
… using diamond anvil cells, synchrotron X-ray diffraction, laser heating, and electrical transport measurements. In La–Y–H systems, partial Y incorporation lowered the formation pressure of LaH10-type clathrates while preserving the hydrogen cage network. Synchrotron X-ray diffraction imaging …
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Investigation of Size Specific Fe2O3 nanoparticles: Towards Single Nanoparticle Resolved Spectro-ptychography
Ptychography is a scanning coherent diffraction imaging technique, where an unlimited field of view can be probed with a high spatial resolution. This technique relies on the increased coherent flux from third-generation synchrotron sources to measure the absorption and phase of a sample. Since …
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Small displacement measurement in ultrasound: quantitative optical noncontacting detection methods
… on the Fourier analysis of coherent light and diffraction imaging properties of an illuminated grating; 2) the design and construction of a two-beam unequal-path laser interferometer for the measurement of out-of-plane surface displacement of ultrasonic waves; 3) extension of a flexible fiber …
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Nanofocusing Refractive X-Ray Lenses
… sample, and the second one is a coherent x-ray diffraction imaging (CXDI) experiment. CXDI is able to reconstruct the illuminated object from recorded coherent diffraction patterns. In a scanning mode, referred to as ptychography, this method is even able to reconstruct the illumination and the …
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Exploring the impact of detection physics in X-ray CCD imagers and spectrometers
… photon-counting X/γ-ray camera. In medical imaging, X-rays and gamma-rays are often used for the purposes of diagnostic imaging. In many synchrotron based research programmes, such as protein crystallography and X-ray diffraction imaging, X-rays are used, once again, for imaging purposes. In …
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Graphene Based Metamaterials For Terahertz Cloaking And Subwavelength Imaging
… applications – including negative refraction, subdiffraction imaging, and even invisibility – which have suggested a wide range of new devices for communications, sensing, and biomedicine. In addition, it has been shown that graphene is amenable to unique patterning schemes such as cutting, …
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Atomic structures of carbon nanomaterials studied by coherent electron diffraction
… challenge in carbon nanoscience. Electron diffraction probes the local structure with electrons interacting with matters much more strongly compared to other structural probes. This thesis reports an investigation of atomic structures of various carbon nanoforms including graphene, CNT and …
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Heterogeneous Redox Chemistries in Layered Oxide Materials for Lithium-Ion Batteries
… scale. Herein, we adopted synchrotron-based diffraction, imaging, and spectroscopic techniques to systematically study the correlation between crystallographic defects and redox chemistries in the nanodomain. Our studies shed light on design principles of next-generation battery materials. In …