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 27 for “"Optical probe"”.
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A bio-optical probe of tryptophyl exposure
Thesis (M.S.)--Michigan State University. Dept. of Biophysics, 1974
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Measurement of near-surface void fraction and macrolayer thickness in boiling water and silica-based nanofluid
… heat transfer, and critical heat flux(CHF). An optical probe used to detect phase was used to measure the void fraction during boiling, from which the macrolayer thickness can be derived. The optical probe was verified to have an error of 11.9% and 10.4% for measuring bubble diameter in water …
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Hydrodynamics and Mass Transfer in Bubble Columns
… bubble columns.</p> <p>In this work, a 4-point optical probe is used to estimate local gas hold-up and bubble dynamics (specific interfacial area, frequency, bubble velocity, and bubble chord-lengths) and their radial profiles in a cold-flow slurry bubble column and a bubble column …
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Through-wafer interrogation of MEMS device motion
… is performing as expected. Previously explored optical and electrical methods of MEMS device monitoring are often only suitable for research environments, or are unable to produce clear and meaningful characterization of device motion. The most desirable MEMS monitoring method would be one that …
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Spatial Localization and Temporal Analysis of Optical Property Fluctuations by Multiplexed Near -Infrared Photon Density Waves in Turbid Media: In Vitro and in Vivo Studies
… the human brain that lead to the changing of the optical parameters that characterize the tissue, measured by our frequency-domain instrumentation. These processes have been divided into two main categories with different time-scales. The slower one is mostly due to the fluctuations in the …
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In-Situ Spectrocopy: Gas Mixture Analysis Using A Simplified Multi-Pass Capillary Cell and Optical Considerations In Dual-Pulse Laser-Induced Breakdown Spectroscopy Analysis of Bulk Aqueous Solutions
… coatings. Coupled with a filtered 24@1 fiber optical probe has resulted in detection limits for CO2, O2, n-butane, CH4 and H2 that are comparable to those in the literature using more complicated systems. </p> <p> Chapter 2 will focus on optical considerations for dual-pulse laser-induced …
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Murine embryonic stem cells and hypoxia : growth kinetics, metabolism, and plating efficiency
… cylinders were used to flush the vessels and an optical probe was used to measure the headspace oxygen concentration. Cells were found to grow faster than atmospheric conditions when in a moderately hypoxic environment where the oxygen concentration was between 2% and 10%, and considerably slower …
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Developments in THz Polaritonics: Towards Integrated Nonlinear THz Spectroscopy
… In a typical polaritonics experiment, the optical pump light is focused to a single line which launches THz fields with electric field strengths of approximately 10 kV/cm. Although the fields are sufficiently strong for THz imaging, any nonlinear spectroscopic applications would require the …
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On the feasibility of integrated optical waveguide-based in situ monitoring of microelectromechanical systems (MEMS)
… explores the feasibility of using integrated optical waveguides to measure the motion of microelectromechanical structures (MEMS). MEMS are a class of silicon devices which are being developed as sensors and actuators. Because these free moving structures are fabricated using processes similar …
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Initial experience of intraoperative identification of parathyroid glands with elastic scattering spectroscopy
… (ESS) has the potential to differentiate optical signatures of the parathyroid gland from surrounding tissues in real-time. METHODS: ESS optical signatures were collected intraoperatively from perfused parathyroid, thyroid, fat, muscle, and nerve tissue during thyroidectomy. The ESS data …
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Development of enhanced performance luminescence-based optical sensor systems for single-analyte and multii-analyte applications
… en- hanced luminescence capture-based optical platforms, and multi-parameter sens- ing using numerical techniques. Three instrumentation electronics systems were developed using a progressive design process that culminated in the development of a DSP-based system which is capable of …
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Statistical aspects of elastic scattering spectroscopy with applications to cancer diagnosis
… (ESS), is a non-invasive and real-time in vivo optical diagnosis technique sensitive to changes in the physical properties of human tissue, and thus able to detect early cancer and precancerous changes. This thesis focuses on the statistical issue on how to eliminate irrelevant variations in the …
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Real-time observation of particle interactions in matter using laser-driven accelerators
… enable transient absorption experiments via pump-probe methodologies across numerous materials, using picosecond scale bursts of x-rays and protons generated via Bremsstrahlung and Target Normal Sheath Acceleration (TNSA) respectively, as the pump source and chirped light with an adjustable …
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Diffusing wave spectroscopy applied to material analysis and process control
… was via a noninvasive, flexible, dip in probe. <br></br><br></br>DWS relies on the concept of the diffusive migration of light, as opposed to the ballistic scatter model used in conventional dynamic light scattering. The specific requirements of the optoelectronic hardware, data analysis …
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Local liquid velocity measurement of trickle bed reactor using digitial industrial X-ray radiography
… to another technique (a two-point fiber optical probe) currently being developed at Missouri University of Science and Technology. The results from this study indicate that, for a gas-liquid-solid type bed, the measured V<sub>LL</sub> can have a maximum range that is between 35 and 51 …
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Next generation near infrared (NIR) and shortwave infrared (SWIR) wearables for breast cancer imaging
… outcomes. Over the last two decades, diffuse optical imaging has been investigated as a potential solution to this problem. This noninvasive and inexpensive technology uses near or shortwave infrared (NIR or SWIR) light to illuminate tissue, and detects multiply-scattered photons. However, …
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Gold nanorod surface functionalization: construction of dynamic surfaces and heterogeneous silica coating
… It has been demonstrated that enhancement of optical properties such as fluorescence and Raman scattering are distance-dependent from the metal surface, which makes the control of distance between the optical probe and gold surface of crucial importance. Meanwhile, researchers have also …
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Spatial localization and temporal analysis of optical property fluctuations by multiplexed near-infrared photon density waves in turbid media: In vitro and in vivo studies
… such as MRI. The limitations in detection of optical property inhomogeneities in tissues, such as tumors or hematomas, is due to the diffusive, highly scattering nature of near infrared light propagation. I have studied and developed methods to improve the spatial localization of these …
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Nonlinear terahertz spectroscopy of electronic and vibrational responses in condensed matter systems
… collinear and noncollinear THz-pump/THz-probe spectroscopy, and THz-pump/optical probe spectroscopies including THz Kerr effect spectroscopy. We have observed nonlinear free-carrier absorption, occurring through the saturation of free-carrier mobility in bulk semiconductors. We have …
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Delivery of molecular-specific optical contrast agents for cancer biomarker detection in live cells and tissues
Molecular-specific optical contrast agents have shown promise as potential non-invasive probes for the detection of cancer and its precursors. The topical use of optical contrast agents in vivo has been hindered, however, by the difficulty of delivering macromolecules through mucosal tissue. My …
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