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 “"Monte Carlo Ray-Tracing"”.
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An exploration of improving sampling within Monte Carlo ray tracing using adaptive blue noise.
… it can be used within the rendering process. Monte Carlo ray tracing is a vastly adopted image syntheses technique used ubiquitously across commercial and academic applications. It is capable of creating very high fidelity physically plausible images with computation that it unrestricted by …
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Acceleration techniques for the radiative analysis of general computational fluid dynamics solutions using reverse Monte-Carlo ray tracing
A reverse Monte-Carlo ray trace capable of performing a radiative analysis on arbitrary multiple overlapping structured computational fluid dynamics solution sets is developed. In order to make effective use of time, a method based on a set of simplifying assumptions but using the same calculation …
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Radiative heat transfer in directly-irradiated high-temperature particle-gas flows
… modified two-flux approximation and iterative Monte Carlo ray-tracing is developed and applied to infer the radiative properties. Subsequently, high-temperature optical and radiative properties of the materials are determined in the spectral range of 3-10 um as a function of temperature in the …
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Radiative heat transfer in directly-irradiated high-temperature particle-gas flows
… modified two-flux approximation and iterative Monte Carlo ray-tracing is developed and applied to infer the radiative properties. Subsequently, high-temperature optical and radiative properties of the materials are determined in the spectral range of 3-10 um as a function of temperature in the …
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Thermal radiative properties of disordered media and deep metal gratings
… the structure were measured and compared with a Monte Carlo ray-tracing program to elucidate the underlining mechanism. (3) The excitation of magnetic polaritons is experimentally demonstrated in several microfabricated grating samples in the near-to-mid infrared region. The influence of …
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Studies on neutron diffraction and X-ray radiography for material inspection
… of the bio and structural materials, X-ray and neutron are widely used because of their distinctive usefulness in investigating different structures. X-ray radiography and neutron diffraction are two widely known non-destructive techniques for material inspection. Here we demonstrate the …
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A Numerical Evaluation of Thermotropic Materials for Polymer Solar Thermal Collectors
… within thermotropic materials is modeled with a Monte Carlo ray tracing algorithm. A parametric study of the radiative transfer in thermotropic materials is conducted. The results are presented as dimensionless plots of transmittance and reflectance as a function of the overall optical thickness …
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Applications of spectral management in optoelectronic devices
… We perform comprehensive device measurements and Monte Carlo ray tracing simulations of LSCs. We find that the measured structures permit waveguide propagation lengths on a par with state-of-the-art nanocrystalline emitters, while proposed hypothetical structures can be seen as viable candidates …
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Radiation force modeling for ICESat precision orbit determination
… to compute such forces were adapted from a Monte Carlo Ray Tracing (MCRT) method originally designed to determine incident heating rates. After working with the vendor of the Thermal Synthesizer System (TSS) to implement these algorithms, a modified version of this software was employed to …
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High efficiency luminescent solar concentrator with interconnected gallium indium phosphide micro solar cells
… integrating them into a sparsely populated 4×4 array is presented in this work. Using wet chemistry for metallization and III-V etching, the process has to potential to be scalable and low-cost. For light concentration, luminescent solar concentrator (LSC) is an attractive system due to its unique …
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Image based analysis of visibility in smoke laden environments
… combines irradiance catching in 3D space with Monte Carlo ray tracing. It can calculate the distribution of scattered radiation with good accuracy without the high cost typically related to zonal method and the limitations in discrete ordinate method. The algorithm has been combined with a two …
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System and Reactor Design, and Materials Testing, for Efficient Thermochemical Solar Fuel Production in Temperature/Pressure Swing Redox Cycles
… Radiation method) achieves the same accuracy as Monte Carlo Ray Tracing with several orders of magnitude lower computational cost. In this thesis we proposed and tested novel composite redox materials containing ceria and magnesium ferrite. Composite pellets were fabricated. A STCH test system …
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Optical and Thermal Analysis of a Heteroconical Tubular Cavity Solar Receiver
… by solving the rendering Equation using the Monte-Carlo ray tracing method. SolTrace - a raytracing software package developed by the National Renewable Energy Laboratory (NREL), commonly used to analyse CSP systems, was utilised for modelling the optical response and performance of the …
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Simulating high flux solar radiation and assessing its influence on a sooty flame
… gap. High flux solar simulators, comprising an array of high-intensity-discharge lamps coupled with elliptical reflectors, have been widely employed to study concentrated solar thermal energy systems. The use of electrical solar simulators holds the advantage over natural solar radiation in …
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Vat Photopolymerization of High-Performance Materials through Investigation of Crosslinked Network Design and Light Scattering Modeling
… properties and (ii) developing a Monte Carlo ray-tracing (MCRT) simulation to predict light scattering and photocuring behavior in particle-filled resins, specifically zinc oxide nanoparticles in a rigid polyester resin and styrene butadiene rubber latex resin. The first portion of …
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Micro-photovoltaic materials and systems for solar energy harvesting and light management
… transparency when assembled in sparse or dense arrays on transparent substrates. This dissertation focuses on i) the design of silicon solar µ-cells for improved device efficiencies, and ii) the integration of silicon µ-cells with systems to enable transparent, flexible, and on-site energy …
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Point-Based Color Bleeding with Volumes
… achieves results comparable to that of existing Monte</p> <p>Carlo integration methods, obtaining render speeds between 10 and 36 times</p> <p>faster while keeping memory overhead under 5%.</p>