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 187 for “"white light"”.
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Bayesian Estimation for White Light Interferometry
… the reconstruction of height maps from scanning white light interferometry is presented. This method unifies the conventional steps of pre- and postprocessing within Bayesian inference. An adept formulation of the prior allows for the exact computation of the height estimate, obviating the need …
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White Light Continuum for Broadband Nonlinear Spectroscopy
… (SC) generation, oftentimes referred to as white-light continuum (WLC), has been a subject of interest for more than 40 years. From the first observation of WLC in condensed media in the early 1970s to the first observation of WLC in gases in the mid-1980s, much work has been devoted to …
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White Light Endoscopy for Minimal Invasive Surgery
… a solid-state LED or laser pumped phosphor white light system. The overall aim was to replace current xenon lamps, which have many unwanted characteristics with lower cost, higher efficiency and more environmentally friendly solid state devices to improve the benefits of endoscopic minimal …
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White light emitting diode as liquid crystal display backlight
The discovery of high brightness (white) light emitting diode (LED) is considered as a real threat to the current lighting industry in various applications. One of the most promising sectors would be using white LED to replace the current Cold Cathode Fluorescent Light (CCFL) technology as the …
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A white light interferometer for improved achromatic holographic lithography
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.
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Commercialization of Quantum Dot White Light Emitting Diode technology
… has the potential to substitute conventional lighting and revolutionize the lighting industry over the next 10 to 20 years. However, successful penetration of this extremely large lighting market would require vast improvements in power conversion efficiencies, color index, light output per …
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An automotive interior lighting application using white light-emitting diodes
In this thesis the commercially available white light-emitting diode (LED) with its inherent efficiency, longevity and mechanical strength, is used to show, that success in energy efficiency can be obtained. Two cases are used to illustrate the need for efficient demand-side technology: the …
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Perfectly White: Light-Skinned Slaves and the Abolition Movement 1835 - 1865
… project looks at American abolitionists use of light-skinned slaves to prove to Northerners slavery was an abomination. This project is also a study of the social constructions of race and the meanings of skin color in Northern and Southern American societies. This research draws mostly upon …
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Analysis and Modelling of a Type II White-light Solar Flare
Type II white-light flares (WLFs) are rare impulsive events in solar atmosphere observed across the electromagnetic spectrum, but without the characteristic emission in hydrogen lines. A unique set of multi-instrument observations is presented with broad wavelength range spectra in the visible and …
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Signal processing techniques for optical fiber sensors using white light interferometry
… limitation can be overcome by using a broadband light source to extract unambiguous information from the sensor in the wavelength domain. Several variations in the signal processing techniques for white light interferometry are discussed and compared in terms of resolution, bandwidth and cost. A …
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Development of Tunable Optical Filters for Interrogation of White-Light Interferometric Sensors
… recovery of a measurand from the phase-modulated lightwaves, and has been a challenge for high performance, high speed, and low-cost, to current white-light interferometry (WLI) techniques, such as the widely used scanning WLI (S-WLI) and spectral-domain WLI (SD-WLI). The performance of a …
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High-Temperature Displacement Sensor Using a White-Light Scanning Fiber Michelson Interferometer
… has been limited. The primary development of a white-light Michelson interferometer that utilizes a sapphire fiber sensing head is presented in this thesis. Development includes efforts to combat the poor optical quality of the sapphire fiber, minimize polarization mode fading, and …
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Experimental Techniques For Nonlinear Material Characterization: A Nonlinear Spectrometer Using A White-light Continuum Z-scan
… regions. However, conventional methods like, white-light continuum pump-probe and Z-scan techniques were used to measure the peak 2PA cross-sections for a number of commercially available photoinitiators. In the new method mentioned above, a high energy, broadband femtosecond white-light …
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Studies of solar white-light flares and small-scale magnetic structures observed in the near infrared
… as developed by NJIT, detailed study of solar white-light flares and small magnetic structures, such as faculae and pores, are presented in this dissertation. The investigations focus on near-infrared observations at 1.56 um, which are good proxy of the deepest layer of the solar photosphere. I …
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In-situ depth monitoring for a deep reactive ion etcher using a white light interferometer with active vibration cancellation
… run. The depth imager consists of a wide-field, white light interferometer with a 12" working distance, capable of imaging across a 1/2" field of view. Active feedback from a co-propagating laser interferometer is used to stabilize the system against vibrations through a feedback loop that …
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Development of new adaptive materials based on spiropyran molecular photoswitches
… merocyanine form (MC), i.e. SP → MC (UV light), MC → SP (green, white light). Furthermore, the MC form possesses a phenolate group that can reversibly bind metal ions and this ion binding is also photo-reversible, as when the MC-ion complex reverts to the passive SP form (upon green/white …
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