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 20 of 29 for “"Raytracing"”.
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Anamorphic raytracing for synthetic alcove holographic stereograms
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Architecture, 1986.
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Developing and optimising a raytracing lighting engine for interactive rendering applications
… part to hardware companies designing GPUs with raytracing as a leading feature, bringing the technology to consumer levels of availability. One of the technologies that contributes to a higher level of believability in a generated image is raytracing. Raytracing approximates how light travels …
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Computerized Ultrasonic Raytracing Model for C-scans of Solid Steel Bridge Pins
This report describes the results of computerized ultrasonic C-scanning of solid steel bridge pins using a raytrace model. The raytrace model was developed to facilitate interpretation of data obtained from an ultrasonic C-scanning system for the Virginia Transportation Research Council (VTRC). The …
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An Investigation of Full-Wave Effects on Lower-Hybrid Wave Propagation, Absorption, and Current Drive
… predicted by numerical simulation using coupled raytracing Fokker-Planck (FP) models. One frequently cited source of this discrepancy is the breakdown of the WKB approximation raytracing is based upon and "full-wave" effects such as diffraction and interference which raytracing cannot resolve. …
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Low-Concentrating, Stationary Solar Thermal Collectors for Process Heat Generation
… results of the collector components as well as raytracing results of different variants are given. The thermal and optical characterization of test samples up to 190 °C in an outdoor laboratory as well as the validation of the raytracing are discussed. A collector simulation model with varying …
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Velocity Structure of the Subducting Nazca Plate beneath central Peru as inferred from Travel Time Anomalies
… plate. Travel time anomalies were modeled by 3-D raytracing. Computed ray paths show that travel times to coastal stations for the eastern Peru events can be satisfactorilymodeled if velocities relative to the surrounding mantle are 6% lower within the uppermost slab (a 6 km thick layer composed …
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Prediction of the beamformed acoustic ray arrival structure for the 1992 Barents Sea coastal tomography test
… three- dimensional ray theory. Through numerical raytracing, followed by eigenray searches and estimations of ray amplitudes, searches and estimations of ray amplitudes, phases and travel times, the arrival structure as a function of time and elevation angle was constructed. The simulation was …
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Tunable liquid microlenses formed from dynamically re-configurable double emulsions
… light. Finite Difference Time Domain and Raytracing techniques were used to characterize the optical properties of the drops and the simulations were verified experimentally immersing the lenses in an aqueous fluorescent medium in order to visualize their light manipulation capabilities. …
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Design And Assessment Of Compact Optical Systems Towards Special Effects Imaging
… special effects was completed, and consequently raytracing software was developed, which was later commercialized by SmARTLens(TM). While the art forms created via raytracing were powerful, they did not predict all effects acquired experimentally. Thus, finally, as key contribution of this work, …
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Local illumination models from surface geometry microform
… Two solutions are presented sampling through raytracing and an analytical approximation. The results convincingly indicate that the intensity from multiply reflected light could be substantial for bumped surfaces with low specular exponent n. Therefore inter-reflection should be accounted for …
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Detection and identification of converted modes and source independent converted phase imaging : Groningen, The Netherlands
… nature. A combination of move-out analysis, raytracing and finite-difference simulations has revealed that the data contain converted phases from two shallow interfaces. We discuss the possibility of using the Source Independent Converted Phase Imaging method to image the position in the …
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Adaptive Optik in der Zwei-Photonen-Mikroskopie
… von der Probe verursachten Aberrationen mittels Raytracing berechnet, und der sich ergebende Signalverlust abgeschätzt. Astigmatismus sowie die beiden niedrigsten Ordnungen der sphärischen Aberration stellten sich als dominant heraus; ihre Korrektur sollte das Fluoreszenzsignal erhöhen. Um diese …
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Exploration of 3D Nanoscale Image Sensor to Enable Logic and Sensing in Single Chip
… in TCAD Synopsys Sentaurus tools. Using the Raytracing optical physics model, the optical response of the Nanowire Image sensor is simulated and photo-current response is observed. The measured optical generation and efficiency have been compared with PN Junction Photo detector and vertical …
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Minimization of aberrations for the Mark IV holographic architecture using optical software modeling
… of the optical setup is performed with a raytracing software package called FRED. Given that Mark IV's original reflector is not a high-precision optical element, the light that reflects off of its surface produces images that are distorted both horizontally and vertically at the viewing …
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Surface plasmon-coupled emission for applications in biomedical diagnostics
… An optical reader was designed and validated by raytracing simulations and aspects of illumination and polarisation were broadly discussed. The use of various materials was assessed in terms of both their chemical stability and compatibility with the biochip design. The proof-of-concept has been …
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Design and Integration of an Underactuated Robotic Finger with Vision-based Tactile Sensing
… are positioned based on the results of a simple raytracing simulator, which guaranteed that each finger segment could be visible in all finger configurations. The use of mirrors, linkage transmission and underactuation makes the mechanism compact, efficient, and less complex by reducing the …
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Optimized ray tracing for real time use without hardware accelerators
Many real time applications such as games or animation engines wish to simulate realistic light transport to present the user with streams of high fidelity images. For decades rasterization was the rendering technique of choice because it is fast and produces high quality images. However, in recent …
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Bedarfsgerechte Auswahl der Dienstqualität für Mobile Cloud-unterstützte Anwendungen
… realer Applikationen durchgeführt. Dazu wird die Raytracing-Funktionalität zur Erstellung fotorealistischer Bilder einer 3D-Hausdesignsoftware und eine Applikation zur fortlaufenden Kamerabildverarbeitung auf Smartphones genutzt. Die erzielten Ergebnisse unter Benutzung von WLAN und 3G-Netzwerken …
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Measurements and modelling of reflection and transmission from smooth and rough surfaces at 62 GHz
… radio channel has also been demonstrated using raytracing. The model has also been utilised to provide estimates of the dielectric parameters of building materials.<br/><br/>Measurements of the scattered field from rough surfaces have also been presented. Purpose made rough surfaces have been …
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Bayesian analysis of electron cyclotron emission measurements at Wendelstein 7-X
… Furthermore, the ray should be determined by raytracing, since ray deflection via the plasma parameter-dependent refractive index can have a serious influence on the model predictions, especially at higher densities. Both is achieved by incorporating the tracing visualized (TRAVIS) code into …
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