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 46 for “"Optical diagnostics"”.
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Optical diagnostics for oral and gastrointestinal tract pathologies
… methods, including imaging, molecular assays and optical techniques, offer promise but lack comprehensive validation and seamless integration into clinical workflow. Most available technologies fail to address critical gaps such as non-invasive early detection, real-time monitoring, and the …
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Validation and implementation of optical diagnostics for particle sizing in rocket motors
Aluminum oxide(Al2O3) particles of known size distribution were cast into a solid propellant which burned at temperatures less than the melting point of Al2O3. Thus, particles of known size distribution existed at the nozzle inlet and in the plume. Malvern particle sizing instruments were used to …
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Development of Mechanical Optical Clearing Devices for Improved Light Delivery in Optical Diagnostics
… disease using light. While there are a myriad of optical systems that have been developed for biological tissue imaging, optical diagnostics, and optical therapeutics, all of these methods suffer severely limited penetration depths due to attenuation of light by tissue constituent chromophores, …
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Development of high-throughput tabletop instrumentation and optical-diagnostics to explore supersonic and hypersonic phenomena
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms
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Optical diagnostics of lithium-sulfur and lithium-ion battery electrolytes using attenuated total reflection infrared spectroscopy
… to thermal runaway and catastrophic failure. An optical diagnostic technique to determine the order and concentration of polysulfides in Li-S battery electrolytes was developed from theoretical models and experimental measurements. The polysulfide diagnostic was used to study the evolution of …
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Laser weld pool optical diagnostics: Topography and visualization used for surface contour analysis and process monitoring
This experimental investigation into shallow laser welding describes new techniques for visualizing, measuring dimensions, and mapping the deformation of the weld pool free surface. The first known measurements of the molten surface contour have been obtained, analyzed, and compared with predicted …
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Heat Transfer and Combustion Characteristics of Nano-Sized Aluminum and Aluminum Oxide Utilizing Advanced Laser and Optical Diagnostics
The present study uses advanced optical diagnostics to explore the heat transfer and combustion characteristics of nano-sized aluminum and alumina (aluminum oxide) particles. The study employs a two-prong approach, conducting two distinct experiments utilizing nano-aluminum and nano-alumina. …
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Characterization of Glow Plug and HCCI Combustion Processes in a Small Volume at High Engine Speed - Load Range, Emission Characteristics and Optical Diagnostics
… experiments on a metal engine and by use of optical diagnostics. Once the glow plug combustion process was fully understood, the engine was modified in order to achieve pure HCCI operations. Initially, a basic investigation was carried out using a metal and optical engine. Later, further …
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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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New approaches for optical and microoptical diagnostics in IC engines
… (HCCI) requires fast, non-invasive in-situ diagnostics methods. Hence, laser-based optical diagnostics are essential for internal combustion (IC) engine research. Within this work, microoptical systems that enable the ap-plication of optical diagnostics methods on unmodified production-line …
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4D combustion and flow diagnostics based on tomographic chemiluminescence (TC) and volumetric laser-induced fluorescence (VLIF)
Optical diagnostics have become indispensable tools for the study of turbulent flows and flames. However, optical diagnostics developed in the past have been primarily limited to measurements at a point, along a line, or across a two-dimensional (2D) plane; while turbulent flows and flames are …
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Fuel Droplet Optical Diagnostic Techniques for Lean Premixed Prevaporized Aeroengine Combustors
… conditions. This work employs a combination of optical diagnostics to enhance the understanding of fuel spray dynamics. Here, Mie scattering is utilized to visualize and measure the penetration depth of fuel sprays inside the combustor at reacting conditions. Both Jet-A and synthetic aviation …
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Instruments design and testing for a Hall thruster plume experiment on the space shuttle
… onboard the Shuttle and will use plasma diagnostics mounted on the palette as well as on an articulated boom. Other objectives include contamination measurements, performance evaluation and optical diagnostics. This work presents first a review of recent papers on the instruments that are …
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Combustion signatures of various energetic metal powders in a shock tube experiment
… aluminum. Spectroscopic analysis helps develop optical diagnostics for systems involving combustions of advanced metals. A shock tube experimental setup was used to ignite the powders, and resultant spectra were recorded. Metals tested include aluminum, boron, magnesium, hafnium, zirconium, …
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Interferometric photomechanical spectroscopy and imaging of biological and turbid media
… experiencing rapid growth in the area of optical diagnostics. Minimally-invasive spectroscopic and imaging modalities enable physicians to make increasingly accurate diagnoses in real time, without the cost and delay associated with traditional reliance on histopathology. We have developed …
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Fast photodiode diagnostic on Alcator C-Mod tokamak to study the plasma edge/SOL structure
… from the hot plasma, two tangentially viewing optical diagnostics have been installed to look at the plasma edge region (0.9 < < 1.1) of the Alcator C-Mod diverted tokamak. The toroidally looking views are coupled to fast photodiode amplifier circuits that record the D, brightness at a rate of …
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Multi-dimensional Flow and Combustion Diagnostics
… transient in time. Therefore, multidimensional diagnostics that are capable of resolving such spatial and temporal dynamics have long been desired; and the purpose of this dissertation is to investigate three such diagnostics both for the fundamental study of flow and combustion processes and …
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Investigation of Endoscopic Techniques for Flow and Combustion Measurements
… reduce the implementation difficulty and cost of optical diagnostics. However, the use of FBEs requires registering the locations and orientations of the FBEs carefully for quantitative measurements, and degrades the spatial resolution of the images transmitted. Hence this work conducted a series …
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Laser, optical and electrical diagnostics of colliding laser-produced plasmas
… such as shadowgraphy are not sensitive. Optical diagnostics such as laser interferometry, fast imaging (angularly resolved) and optical emission spectroscopy have been employed to probe colliding plasmas, revealing important factors in the formation of the stagnation layer. For example …
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Optical investigation of ethanol and n-heptane dual-fuel partially premixed combution in s reciprocating engine
… of n-heptane and ethanol were investigated in an optically accessible engine representative of light-duty applications. Experimental work involved the application of optical diagnostics such as high-speed imaging of combustion chemiluminescence and soot radiation, spectral measurements and laser …
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