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 6 of 6 for “"coded apertures"”.
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Programmable Aperture Photography: An investigation into applications and methods
… photography are ever growing with new focuses on coded aperture imaging and its real-world applications. Research has shown that coded apertures are far superior to traditional circular apertures for various tasks. A variety of coded aperture patterns have been proposed and developed over the …
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Design of a near-field coded aperture cameras for high-resolution medical and industrial gamma-ray imaging
Coded Aperture Imaging is a technique originally developed for X-ray astronomy, where typical imaging problems are characterized by far-field geometry and an object made of point sources distributed over a mainly dark background. These conditions provide, respectively, the basis of artifact-free …
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Charged Particle Optics Simulations and Optimizations for Miniature Mass and Energy Spectrometers
… in question to be determined.In this work, coded apertures are shown to be compatible with sector instruments, though architectural challenges exist. Next, simulation allowed for the discovery of a new class of mass spectrograph which addresses these challenges and is compatible with …
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Development of X-ray Fan Beam Coded Aperture Diffraction Imaging for Improving Breast Cancer Diagnostics
… XRD measurements in a single snapshot, while a coded aperture is placed between imaged objects and detector, enabling XRD spectra for individual pixels along the fan beam extent to be recovered from the multiplexed measurement. Simulations were used to identify a suitable geometry for the …
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Design and Qualification of a Coded Aperture Cycloidal Mass Spectrometer to Detect Perfluorocarbon Tracer Molecules for Environmental Applications
… PFC detection method is required. A cycloidal coded aperture miniature mass spectrometers (C-CAMMS) could be such a method due to its integration of three core technologies that help to overcome the throughput versus resolution tradeoff that has historically hampered the miniaturization of mass …
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Point Spread Function Engineering for Scene Recovery
… lenses of different focus settings. Circular apertures produce circular defocus PSFs. In this thesis, I show that the use of a circular aperture severely restricts the accuracy of DFD, and propose a comprehensive framework of PSF evaluation for depth recovery. With this framework, we can …