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.
Results
Showing 1 to 20 of 106 for “"Optical techniques"”.
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Optical Techniques for Fruit Firmness Assessment
… modified Lorentzian models to extract a sample’s optical properties (absorption and reduced scattering coefficients) and optical parameters respectively. The high-speed MSI system was designed to capture images of fruit using a high-resolution complementary metal–oxide–semiconductor camera, 12.5 …
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Application of optical techniques to surveying
… commonly found structures using the technique of optical triangulation with a linear array camera and diode laser light source. Optical triangulation is a technique that has not fully matured for medium range measurement with few systems having been developed and little research material produced. …
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Advanced optical techniques for high capacity transmission
This thesis presents several advanced optical techniques that are crucial for improving high capacity transmission systems. The basic theory of optical fibre communications are introduced before optical solitons and their usage in optically amplified fibre systems are discussed. The design, …
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Cure monitoring of composite materials using optical techniques
A fully remote all optical technique for the generation and detection of ultrasonics in epoxy materials has been developed at Victoria University. This requires a high power pulsed laser to induce ultrasound in the sample and an optical fibre interferometer for detection. The output of the …
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Radio and Optical Techniques for Locating Equatorial Plasma Irregularities
… of depletions. This dissertation describes new techniques to combine optical and radio ionospheric remote sensing data in common formats to leverage observational strengths and mitigate weaknesses, leading to new or improved physical interpretations. Principally, a technique for locating …
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Matter wave optical techniques for probing many-body targets
… system, comprised of ultracold atoms in an optical lattice. We investigate non-destructive techniques for probing the superfluid to Mott insulator transition by studying the scattering cross section of the cold atoms for matter waves. We show that the angular cross section of the target …
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New optical techniques and hardware for studying live cell dynamics
Fluorescence optical microscopy has become an integral technique in the life sciences and has opened the door to investigating live biological specimens non-invasively at sub-cellular spatial resolutions with high specificity and temporal resolutions. One of the limiting factors of optical …
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The Development of Quasi-Optical Techniques for Log Wavelength Imaging
This thesis concerns the development of quasi-optical techniques for long-wavelength imaging, which was conducted through a combination of experimentation and computer simulation. This work was conducted as part of a SFI-funded research program undertaken by the THz Optics group of the Department …
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Evaluation of optical techniques applied to online turbomachinery blade vibration measurements
… use of non-contact methods. Contact measurement techniques for turbomachinery blade vibration analysis typically involve the use of strain gauges and accelerometers. These present some complications when analyzing rotating machinery. Being contact in nature, mass loading can affect the integrity …
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Excitation of source electromagnetic waves at microwave frequencies using optical techniques
… waves (SEW} for both the prism and the grating techniques have been studied experimentally in the microwave frequency range. The grating experiments included studies of the SEW coupling efficiencies as functions of the frequency, the angle of incidence, the grating constant, the number of …
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Electrical breakdown and structural characterization in synthetic resins using optical techniques
… in synthetic resins, various non-evasive optical techniques were developed to quantitatively characterise resin microstructure and residual internal mechanical (RIMS) and to study the physical processes occurring during electrical tree initiation and tree growth in the pin-plane geometry. …
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Sintering of glass films on rigid substrates studied by optical techniques
… + silica films on rigid substrates were studied. Optical measurement techniques were devised to determine the shrinkage profiles of the free and constrained films and in-plane stress in the constrained films. These films were prepared from slurries of the powder by tape casting. Sintering was …
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Nonlinear Optical Techniques For Imaging And Manipulating The Mouse Central Nervous System
… of novel multi-photon microscopy (MPM) and optical manipulation techniques as they apply to studies the mouse central nervous system (CNS), with an emphasis on the spinal cord. The scientific findings which have resulted from the implementation of these techniques are also presented. In …
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Using optical techniques to measure aluminum burning in post-detonation explosive fireballs
… study has indicated that explosive fireballs are optically thick. Therefore, external measurements are biased toward conditions near the fireball surface. The objectives of the current study are twofold: (1) to further the understanding of aluminum combustion in an explosive fireball, specifically …
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Integration of electronic and optical techniques in the design and fabrication of pressure sensors
… on Fabry-Perot interferometry the more promising optical pressure sensors due to their high degree of sensitivity, small size, high temperature performance, versatility, and improved immunity to environmental noise and interference. The work presented in this dissertation comprises the design, …
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Characterization of hydrogen mixing and combustion properties in spark ignition engines investigated through optical techniques
L'abstract è presente nell'allegato / the abstract is in the attachment
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Facile protein and amino acid substitution reactions and their characterization using thermal, mechanical and optical techniques
The work focused on addressing four main objectives. The first objective was to quantify protein and amino acid substitution reactions. Michael addition reactions were used to modify the amino acids and protein. Amino acids alanine, cysteine, and lysine, and protein ovalbumin (OA) were substituted …
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Ultrasonic fields in fluids: theoretical prediction using difference equations and three dimensional measurement using optical techniques
A technique for calculating bulk ultrasonic fields which uses implicit difference equations to evaluate the parabolic approximation to the Helmholtz equation is described. The parabolic approximation assumes that the field varies much faster in the transverse directions than in the direction of …
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Study of microwave-assisted magnetization dynamics in magnetic films and structures
… in different spatial regimes by electrical and optical techniques to understand their influence on reversal processes. Time-resolved optical techniques have been developed to study spin wave generation in large area patterned thin films and the interaction of different modes. The study revealed …
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Optical characterization of thermal transport from the nanoscale to the macroscale
… upward in solids and liquids using pump-probe optical techniques. The design and implementation of a system that is uniquely suited to thermal measurements is described in detail, and the theory for interpreting the measurement results is developed using a linear systems approach, accounting …
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