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 19 of 19 for “"Lens design"”.
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Diffractive optical lens design and fabrication for integrated monitoring of microelectromechanical lateral comb resonators
… system monitoring. This research addresses the design, fabrication and testing of diffractive optical elements (DOES) for achieving IOM. DOES for on and off-axis single and multiple beam generation are modeled based on a linear optical system model paraxial gaussian beam theory.;The DOEs are …
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Tri-phase emulsions as tunable liquid lenses with aberration correction
… represent a versatile material platform for the design of in-situ tunable lenses. One challenge in fluid lens design is the minimization of aberrations that are related to refraction of light at spherical interfaces. These aberrations can in principle be compensated by systematic arrangement of …
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Development of Multielectrode Electroretinography (meERG) for Human Clinical Use
… a human-compatible meERG system using a Contact Lens Electrode Array (CLEAr) lens, with the overarching goal of advancing the technique toward clinical translation. Methods Three Specific Aims were pursued. Aim 1 focused on improving CLEAr lens design, incorporating wireless amplification, …
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Design and Development of Advanced Adaptive Polymer Lenses
… describes advancements made in adaptive polymer lens design and implementation. Singlets and doublets lenses were constructed for visible, short- wavelength infrared (SWIR), and middle-wavelength infrared (MWIR)applications. The lenses are implemented in a variety of tactical imaging systems to …
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Focal waveform of a prolate-spheroidal impulse radiating antenna (IRA)
Impulse Radiating Antennas (IRAs) are designed to radiate very fast pulses in a narrow beam with low dispersion and high field amplitude. For this reason they have been used in a variety of applications. IRAs have been developed for the transient far-field region using paraboloidal reflectors. …
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A Critical Assessment of the Finite Element Method for Calculating Magnetic Fields in Electron Optics
… magnetic field distribution in magnetic electron lenses by means of the finite element method. A critical comparison is made of the available finite element computer programs. Necessary modifications have been made in certain programs, useful comments and general data format were written for two …
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Myopia management leadership and modern orthokeratology self-learning in troubleshooting
… in Orthokeratology is an instructional design textbook focusing on the Ortho-K learners' perspective in troubleshooting. This modern Ortho-K education is a concise and advanced curriculum that encourages learners to think purposefully and concentrate on the learning outcomes. The …
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Development of terahertz diffractive optics and plasmon-phonon polaritonics components /
… ablation fabricated multilevel phase Fresnel lenses and metal Soret zone plates for focusing of 0.6 and 4.7 THz frequency radiation are discussed in the first part of this dissertation. Characterization of fabricated components was carried out, demonstrating the applicability of the …
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Structural and functional aspects of myopia in young adults. An investigation of nearwork-induced transient myopia and accommodation in relation to refractive stability.
… using a low coherence reflectometry device (LenStar, Haag Streit Koeniz, Switzerland). Fourthly, a comparison of the differences between static and dynamic accommodative responses, microfluctuations and nearwork-induced transient myopia produced when viewing a black/white target as oppose to …
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Nanofocusing Refractive X-Ray Lenses
… the production of nanofocusing refractive x-ray lenses. These optics made of either silicon or diamond are well-suited for high resolution x-ray microscopy. The goal of this work is the design of a reproducible manufacturing process which allows the production of silicon lenses with high …
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Design and Experimental Applications of Acoustic Metamaterials
… completely new applications (e.g. acoustic superlens that can exceed the diffraction limit in imaging or acoustic absorbing panels with higher transmission loss and smaller thickness than regular absorbers). Our objective is to surpass the limited frequency</p><p>operating range imposed by the …
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Ocular biotribology and contact lens lubrication mechanisms
… thesis is concerned with mechanisms of contact lens lubrication. There are three major driving forces in contact lens design and development; cost, convenience, and comfort. Lubrication, as reflected in the coefficient of friction, is becoming recognised as one of the major factors affecting the …
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Microwave Lens Designs: Optimization, Fast Simulation Algorithms, and 360-Degree Scanning Techniques
Microwave lenses support low-phase error, wideband, wide-angle scanning, and true-time delay (TTD) beam forming. They provide ideal performance for applications such as satellites, remote-piloted vehicles, collision-avoidance radars and ultra-wideband communications systems. The emerging printed …
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Advances in Complex Electromagnetic Media
… no natural equivalent. Classical tools for the design of optical or radio frequency devices are often ill-suited to utilize such media or have shortcomings in their ability to capture important physics in the device behavior. Recently it has been demonstrated that the structure of Maxwell's …
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Wettability and hydrophilicity of rigid and soft contact lens surfaces
In the last two decades an abundance of contact lens materials with unknown surface properties have been introduced as well as new contact lens design. Recent studies have identified the importance of physical and chemical interactions between materials and liquids. The purpose of this experimental …
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Adaptable Design Improvements For Electromagnetic Shock Wave Lithotripters And Techniques For Controlling Cavitation
… (SWL) breaks stones in order to guide design improvements to a modern electromagnetic (EM) shock wave lithotripter. To accomplish this goal, experimental studies were carefully designed to isolate mechanisms of fragmentation, and models for wave propagation, fragmentation, and stone …
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Diffraction-based Optical Architectures for Processing One-dimensional Data
… extended further to introduce new methods for designing aberration-free gradient index lenses. Parameter sweeps are demonstrated to find lenses within the framework, with minimal dynamic range of refractive index distributions found from two families of aberration-free collimation lenses. As …
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Contribution to the analysis and design of transmitarray lenses = Contribución al análisis de lentes tipo transmitarray
… entitled ‘Contribution to the Analysis and Design of Transmitarray Lenses’ aims to be continuation of the research line in antennas and radiating devices, with special interest in the area of reconfigurable antennas, in the Radiation Group (Grupo de Radiaci´on, GR) of the department of …