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 59 for “"Optical technique"”.
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Novel Optical Technique for Real-Time Pattern/Image Recognition
… real-time joint-Transform correlation (JTC) technique for optical pattern recognition. To replace the film recording aspect of performing optical correlation, conventional real-time joint-Transform correlation (JTC) optical systems make use of a spatial light modulator (SLM) located in the …
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Characterization of Flexible Flapping Wings and the Effects of Solar Cells for Miniature Air Vehicles
… comprising efficiency (i.e. performance). An optical technique is developed to characterize the effects of adding flexible solar cells to the shape of the flexible wing structure. A customized test stand for measuring lift and thrust assesses the effects of the solar cells on the flight …
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Investigation of Surface Displacements Induced in Loaded Cross-Ply Composite Laminates with Microcracking
… is important in determining whether or not the optical technique is sensitive enough to resolve the data. The lateral distance to the peak values and the far-field values are also obtained. These distances are important in determining whether or not an optical system can spatially resolve the …
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A dual-laser interferometry system for thin film measurements in thermal vapor deposition applications
… properties of the carbon dioxide resist via the optical technique of dual-laser interferometry in conjunction with a quartz crystal micro balance (QCMB).
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Laser induced incandescence imaging for the investigation of soot formation in laminar flames
… setups. Laser induced incandescence (LII) is an optical technique used in laser diagnostics to measure soot volume fraction and estimate particle size in-situ. Using imaging to measure LII allows for a range of combustion environments to be investigated and soot volume fractions to be measured. …
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Reflectance photoplethysmography for non-invasive monitoring of tissue perfusion
… importance and for this reason many different techniques have been developed over the decades. Photoplethysmography (PPG) is an optical technique that measures blood volume variations in vascular tissue and it is well known for its utilisation in pulse oximetry for the estimation of arterial …
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Early diagnosis of cancer using light scattering spectroscopy
This thesis presents a novel optical technique, light scattering spectroscopy (LSS), developed for quantitative characterization of tissue morphology as well as in vivo detection and diagnosis of the diseases associated with alteration of normal tissue structure such as precancerous and early …
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Quantitative biological Raman spectroscopy for non-invasive blood analysis
… glucose measurements for diabetic patients. This optical technique enables non-contact, painless measurements with no sample preparation and simultaneous determination of multiple analytes. Such a technology could greatly impact the healthcare practices for the entire population. This thesis …
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Optical method of recording electrical activity in isolated rabbit hearts
A recently developed optical method utilizes a single, implantable, optical fiber to record electrical activity from isolated hearts stained with voltage-sensitive dyes. This optical technique generates recordings of transmembrane potential from excitable myocardial tissue, and remain free from …
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Mid infrared spectroscopic imaging and tomography
… Infrared (FT-IR) Spectroscopic Imaging is an optical technique that simultaneously provides morphological (two dimensional) and mid-infrared spectral (one dimensional) information for a specimen under observation. In this dissertation, we develop a new instrument that extends the capabilities …
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An experimental investigation of the effect of temporal equivalence ratio fluctuations on NO<sub>x</sub> emissions in premixed flames
… Time-varying equivalence ratio was measured optically, time-varying temperatures were measured with thermocouples, and mean NO<sub>x</sub> emissions were measured by probe sampling and a chemiluminescent analyzer. These measurements quantify the effect of temporal unsteadiness and spatial …
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Dynamics of interfering wave packets in rubidium by high resolution quantum beat spectroscopy
… and their dynamics was observed by an all-optical technique of parametric four wave mixing (PFWM). The experimental apparatus designed, constructed and automated for this work provided unprecedented signal intensity that enabled time-frequency-resolved analysis of wave packet dynamics with …
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Heat and mass transfer effects of ice growth mechanisms in water and aqueous solutions
… cell made of Plexi-glass®. The Colour Schlieren optical technique was used to conduct the experiments. This is because of its capability to map refractive index gradients related to either temperature or/and concentration gradients of the solution during crystal growth.
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Coherent multi-exciton dynamics in semiconductor nanostructures via two-dimensional Fourier transform optical spectroscopy
… In this work, I present a novel optical technique, two-quantum two-dimensional Fourier transform optical spectroscopy, which allows direct observation of the dynamics of multiple-exciton states that reflect the correlations of their constituent electrons and holes. The approach is …
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Digital Holographic Microscopy for Measurement of Cellular Refractive Indices
Holography is an optical technique in which the wave nature of light is used to produce three-dimensional images of an object of interest. In addition to the flat 2D representation of a photograph, the holograph also records the depth of field by recording the phase of an incoming wave field. The …
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An algorithm for extracting the PPG Baseline Drift in real-time
Photoplethysmography is an optical technique for measuring the perfusion of blood in skin and tissue arterial vessels. Due to its simplicity, accessibility and abundance of information on an individual’s cardiovascular system, it has been a pervasive topic of research within recent years. With …
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Development of a fluorescence based optical diagnostics technique and investigation of particle ingestion and accumulation in the contact region of rotating shaft seals
… behavior, a unique non-invasive two-dimensional optical technique which allows instantaneous measurement of the lubricating film thickness and temperature was developed. The technique is based on the use of Laser Induced Fluorescence (LIF). In its simplest form, LIF has a number of limitations …
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Digital ear scanner : measuring the compliance of the ear
… a hearing aid can be greatly improved. Current optical techniques for 3-D imaging are too expensive to be implemented in the ear canal for the purpose of custom fitted hearing aids. A new absorption based optical technique is introduced, which is capable of generating three dimensional maps of …
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Interferometric, acousto-optic modulated diffuse correlation spectroscopy @ 1064 nm (AOM-iDCS) toward higher sensitivity, non-invasive measurement of cerebral blood flow
… Correlation Spectroscopy (DCS) is an established optical technique that enables continuous, non-invasive, and direct measurements of CBF. The effectiveness of DCS in measuring CBF is hampered in adults by extracerebral contamination and limited depth sensitivity. The goal of this dissertation is …
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Localized Surface Plasmon Resonance: Nanoscale Sensing for Processes at Interfaces
… reports the use the emerging surface-sensitive optical technique of localized surface plasmon resonance (LSPR) to characterize the interaction of relevant classes of biomolecules, e.g. peptides, proteins, lipids and DNA strands, at solid-liquid interfaces, with an emphasis on deciphering …
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