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 96 for “"Optical Measurements"”.
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Fluxes of Sporadic Meteoroids from Optical Measurements
… of the sporadic meteor sources using an electro-optical system. Data was recorded on two nights, April 27 and May 6, 2006, and the system was tested by measuring the flux of the eta Aquariid meteor shower. Eta Aquariid fluxes yielded ZHRs of 14.3 ± 4.5 meteors hr'1and 65 ± 10 meteors hr'1 on the …
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Design of Optical Measurements for Electrothermal Plasma Discharges
… values as expected for this region. Velocity measurements of PIPE match well with simulations at around 5333 m/s. This study concluded that the assumption that the propellant Lexan is completely dissociated is a valid assumption, and that the ETFLOW results for electron temperature, density, …
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Planning and validation of vehicle degradation using simulation and optical measurements
Thesis (S.M.)--Massachusetts Institute of Technology, System Design & Management Program, June 2002.
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Phytoplankton community structure determined through remote sensing and in situ optical measurements
Linking variability in optical signals with phytoplankton community characteristics is important to extend the use of the vast resource that is the satellite ocean colour archive. Detection of species, functional types or size classes has been addressed through a spectrum of empirical to analytical …
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Particle Sensing in Gas Turbine Inlets Using Optical Measurements and Machine Learning
… effects and real-time engine health monitoring. Optical measurement techniques are attractive for this application due to their non-intrusive nature. However, conventional optical particle measurement methods assume the particle to be spherical, which introduces large errors for measuring …
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Direct Aerosol Radiative Forcing Based on Optical Measurements at Contrasting, Climatically Important Sites
… radiative forcing of climate ( DARF), aerosol optical properties were measured at two contrasting locations, a clean marine Southern Hemisphere site (Cape Grim Tasmania) and an anthropogenically perturbed Northern Hemisphere site (Sagres, Portugal). Total light scattering and backscattering …
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Underwater in situ optical measurements and coral fluorescence for shallow water remote sensing
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996.
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Design of Optical Measurements for Plasma Actuators for the Validation of Quiescent and Flow Control Simulations
… actuators. The research in this thesis uses optical measurement techniques to validate computational models of flow control actuators being done concurrently at Virginia Tech. The primary focus of this work is to design, build and test plasma actuators in order to determine the plasma …
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Optical measurements of nano-aluminum combustion in a heterogeneous shock tube and in a flat flame burner
… nano-aluminum burntime. Also, similar burntime measurements were made in the hot ambient gases of a one dimensional flat flame burner. Three different particle sized were studied (50, 80, and 110 nm). The burntimes of each were measured using high speed CMOS imaging allowing for a comparison of …
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Optical Measurements of High-Viscosity Materials Using Variations of Laser Intensity Incident on a Semi-Rigid Vessel for use in Additive Manufacturing
… costs less than $100 and is capable of taking measurements of 1 - 2 μm at a 0.535 ms (1870 Hz) sampling rate. For comparison, the stepper motor driving the material extruder operates at 0.667 ms (1500 Hz). Using this experimental setup, an inverse correlation is shown to exist between the …
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Optical Signatures of Bioavailable and Terrigenous Dissolved Organic Matter Across Long Island Sound and Hudson River Estuaries
<p>Optical measurements, from <em>in situ</em> to satellite-based sensors, provide a powerful framework for examining the sources, sinks, and transport pathways of dissolved organic matter (DOM) across the land–ocean aquatic continuum. By integrating observations across spatial and temporal scales, …
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Exploring possibilities to enhance silicon solar cell efficiency by downconversion of sunlight.
… followed by the experimental characterization. Optical measurements such as absorption spectra, fluorescence spectra and fluorescence quantum efficiency are undertaken. These optical measurements enabled to understand physical processes associated with the materials used. Furthermore, the work …
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Bombardment of Thin Lithium Films With Energetic Plasma Flows
… as compared to a bare target. Furthermore, optical measurements are made to determine the density and temperature of the lithium vapor cloud as it expands away from the target surface. A collisional-radiative model for both neutrals and singly ionized lithium is used to model the lithium …
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Turbulent flow through a rectangular channel
Streamwise and normal turbulent velocity measurements were taken at 80 normal locations across a two-inch high rectangular water channel. A two polarization, three beam He-Ne Laser-Doppler Velocimetry system was used. The water channel was specifically designed and constructed to facilitate these …
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Electronic Structures of Cadmium Sulfide and Zinc Oxide
… band structure is compared with the available optical data. The band gap is found to be direct and equal to 7.1 eVe No simple explanation for the anomalous diamagnetism observed experimentally is found in the calculations of the zinc-blende form. Energy band calculations are performed on zinc …
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Design of an Automated, High-Throughput Optical Characterization Tool for Photovoltaics
… be made. Researchers typically perform multiple measurements on each device using various manual characterization tools. This practice is ultimately time-intensive, inefficient, and expensive. This thesis documents the development of an automated, large-format characterization tool capable of …
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Assessing the accuracy of the MODIS LAI 1-km product in southeastern United States loblolly pine plantations: Accounting for measurement variance from ground to satellite
… map involved: (1) the collection of in situ LAI measurements via indirect optical measurements, (2) the correlation of land cover specific LAI estimates with spectral values retrieved from high resolution imagery (20 m--30 m), and (3) the aggregation of these 30 m cells to 1 km spatial …
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Interband and intraband optical studies of CdSe colloidal nanocrystal films
We present results for optical measurements on charged CdSe nanocrystals. The injection of electrons into quantum confined states is confirmed by monitoring changes in the visible and infrared absorption spectra. Interestingly, the response is observed only in the nanocrystals that have been …
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Optical absorption of bismuth silicon oxide (Bi₁₂SiO₂₀) crystals
The purpose of this work is to characterize the optical absorption in bismuth silicon oxide (Bi₁₂SiO₂₀) crystals grown using the Bridgman technique and to identify electronic transitions responsible for absorption. Optical measurements were taken in the range of 0.4 - 11 pm at 300 K and 77 K using …
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Differential Sedimentation In A Mississippi River Crevasse Splay
… mouth bar. Simultaneous hydroacoustic and optical measurements on the mouth bar show that the bar conforms to the progradational stage of an existing conceptual model of mouth bar development. This is confirmed by cores dated using Beryllium-7, which provides a record of the deposition on …
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