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 74 for “"thermal emission"”.
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Thermal Emission from Structured Media
… macroscopic structure as a means of controlling thermal emission in the THz and mid-IR frequency regions. Chapter 1 presents a brief introduction to the THz frequency region and to the concept of the photonic crystal, the primary type of geometry used. Chapter 2 compares the two most common …
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Thermal emission measurement and calibration
This thesis details a measurement setup and experimental procedures for emittance measurements using a Fourier transform infrared spectrometer. We calibrate the FTIR measurement system using measurements of a blackbody source at two temperatures to obtain the true emittance and absolute spectral …
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Advanced nanofabrication of thermal emission devices
Nanofabricated thermal emission devices can be used to modify and modulate blackbody thermal radiation. There are many areas in which altering thermal radiation is extremely useful, especially in static power conversion, lighting and sensor applications. Two specific thermal emission devices which …
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An ultrafast thermal emission spectrometer for investigating temporal thermal emission of metal thin-films and their reactive derivatives
… onto sample films affixed to glass slides. The emission generated by the ablation of the films was collected and focused into a spectrograph and subsequently directed into a Hamamatsu C4334 streak device. It was found that this system was capable of providing spectral and temporal information …
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Tunable absorption and selective thermal emission from engineered metals with thin dielectric coatings
… spectrum because it includes both the peak thermal emission of objects at room temperature and the molecular absorption resonances of many common liquids and gases. Thermal sensing and imaging is widely used in industrial and defense applications, and the ability to manipulate an object’s …
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Assessing Coastal Plain Wetland Composition using Advanced Spaceborne Thermal Emission and Reflection Radiometer Imagery
… In this study, we used the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) to separate wetlands from uplands in a study of 870 locations on the Virginia Coastal Plain. We used the first five bands from each of two ASTER scenes (6 March 2005 and 16 October 2005), covering …
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Studies of Thermal Emission Rates and Optical Cross-Sections of Carriers at Gold Centers in Silicon Using the Impurity Photovoltaic Effect
Made available in DSpace on 2015-05-12T21:41:53Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7000999.PDF: 8031245 bytes, checksum: fd46fca9713c000f5839d6f2d6e6f25d (MD5) Previous issue date: 1969
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Studies of thermal emission rates and optical cross sections of carriers at gold centers in silicons using the impurity photovoltaic effect
… the photocurrent it is possible to determine the thermal emission (or generation) rates and photoionization cross sections of carriers from the impurity centers! This information may be obtained without knowledge of the impurity concentration. The impurity photovoltaic effect is applied to study …
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Defects, thermal phenomena and design in photonic crystal systems
… and absorptivity are equal for an object in thermal equilibrium. Coupled with the Second Law of Thermodynamics, one can show that no object can emit more than a blackbody at any given frequency, direction or polarization. While this provides a theoretical maximum to the intensity of thermal …
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Composite cure and post-gel shrinkage with different halogen and LED curing lights
… through various selected properties such as the thermal emission, effectiveness of cure, depth of cure, polymerization shrinkage and degree of conversion. Ten different light curing regimens including pulse (EL1), continuous (FL1, EL2, TL1), turbo (EL3, AS1) and soft-start (FL2, EL4, TL2) modes …
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Thermal and Radiative Properties of Exoplanet Atmospheres Across the Mass Range
… years, revealing a remarkable diversity of thermal, chemical and dynamical conditions. In particular, thermal emission observations of such atmospheres provide unique insights into their temperature profiles, chemistry and energy transport mechanisms. In this thesis, I explore the radiative …
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Reststrahlen band optics for the advancement of far-infrared optical architecture
… techniques for developing far-infrared emission sources using selective thermal emitters, which could operate more efficiently than their simple blackbody counterparts commonly used as sources in this wavelength region. The later projects probe the possible means of linking bulk optical …
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Near-infrared Characterization of the Atmospheres of Alien Worlds
… thesis I present near-infrared detections of the thermal emission of a number of hot Jupiters and likely transit depth differences from different wavelength observations of a super-Earth. I have pioneered ``Staring Mode'' using the Wide-field Infrared Camera on the Canada-France-Hawaii Telescope …
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Infrared to millimetre observations of active galaxies
… thesis presents measurements of the continuum emission at infrared (IR) to millimetre wavelengths from the nuclear regions of a number of active galaxies. In particular many observations have been made for the first time in the submillimetre regime. The observing methods at these wavelengths …
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Massive Star Formation at High Spatial Resolution
… regions are observed in the infrared. The thermal emission from the ultra-compact HII regions is resolved and the spectral type of the ionizing stars is estimated. The hot cores are not detected thus implying line-of-sight extinction larger than 200 visual magnitude. 2) The first …
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Thermally Generated Traps in Boron Implanted Phosphorus Doped Silicon (Semiconductor, Defect)
… Measurements were made of the carrier thermal emission rates, emission cross sections, and activation energies for two thermally generated hole traps and six thermally generated electron traps. These traps do not appear to be present in the silicon immediately after implantation; they …
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Photon management in thermal and solar photovoltaics
… the photons are from artificially designed thermal emitters that operate at a lower temperature. The differences in the photon sources lead to different research emphases on the two photovoltaic systems in this work. This thesis investigates ways to control photon emission and absorption for …
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Characterizing Exoplanet Atmospheres: From Light-curve Observations to Radiative-Transfer Modeling
… WASP-8b and TrES-1, determining their day-side thermal emission in the infrared spectrum. The emission data of WASP-8b indicated no thermal inversion, and an anomalously high 3.6 micron brightness. Standard solar-abundance models, with or without a thermal inversion, can fit the thermal emission …
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Efficient silicon micro-reactors for thermophotovoltaic applications
… high-temperature applications such as selective thermal emitters for TPV energy conversion. Interference lithography and reactive ion etching are used to produce large-area single-crystal tungsten 2D PhC's. The fabricated PhC consists of an array of cylindrical cavities with 800nm diameter, 1.2 …
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