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 34 for “"optical scattering"”.
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Electric field controlled optical scattering in nematic liquid crystal films.
Thesis. 1975. B.S. cn--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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An experimental investigation of diffuse optical scattering from stationary and flowing dispersions
… the measurement and interpretation of diffuse optical scattering from concentrated colloidal dispersions. Novel measurement techniques using optical fibres are investigated. These are applied to monodisperse spherical latexes where the results are compared with theories of radiative transport, …
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Scalar Scattering Theory and Physics-inspired Optimization for Computational Imaging
… on the critical problems of phase retrieval and optical scattering—essential for accurately extracting physical information from photons. It aims to enhance the understanding and computational efficiency of existing models by addressing the fundamental challenges encountered due to diffraction …
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Optical-Resolution Photoacoustic Microscopy
Optical microscopy, providing valuable biomedical insights at the cellular and organelle levels, has been widely recognized as an enabling technology. Mainstream optical microscopy technologies, including single-/multi-photon fluorescence microscopy and OCT, have demonstrated extraordinary …
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Optical and acoustic beam shaping for imaging and manipulation
… wave properties such as reflection, refraction, scattering, diffraction, and so on. The similarities between them bring a lot of opportunities for translating knowledge of one onto the other. When compared to ultrasound, and particularly in microscopy and micromanipulation, optics is a …
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Operando Optical Tracking of Ion Dynamics and Degradation in Battery Electrodes
… introduces and establishes a laboratory-based optical scattering microscopy methodology to resolve lithium-ion dynamics in individual active particles, under operating conditions. First we apply this technique to follow cycling of the archetypical cathode material LiCoO₂ (LCO). We visualise the …
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Imaging and spectroscopy of tissue-like phantoms using photon density waves: Theory and experiments
The determination of the optical properties of turbid biological media is of primary importance in several areas of medicine and biotechnology. In particular, the quantitative determination and spatial localization of the optical scattering and absorbing properties of biological tissue would allow …
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Assessment and Diagnosis of Human Colorectal and Ovarian Cancer using Optical Imaging and Computer-aided Diagnosis
<p>Tissue optical scattering has recently emerged as an important diagnosis parameter associated with early tumor development and progression. To characterize the differences between benign and malignant colorectal tissues, we have created an automated optical scattering coefficient mapping …
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Analytical and Experimental Characterization of a Linear-Array Thermopile Scanning Radiometer for Geo-Synchronous Earth Radiation Budget Applications
… discrete Green's function to characterize the optical scattering of radiant energy in the cavity, along with a data-processing algorithm to correct for the scattering. Finally, a parametric study of the sensitivity of the discrete Green's function to uncertainties in the surface properties of …
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Ultrasound-encoded optical tomography and time-reversed ultrasonically encoded optical focusing
Ultrasound modulated optical tomography is a developing hybrid imaging modality that combines high optical contrast and good ultrasonic resolution to image soft biological tissue. We developed a photorefractive crystal-based, time-resolved detection scheme with the use of a millisecond long …
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A fast optical imaging study of frontoparietal preparatory dynamics in response-mode switching
… demanding tasks. With the event-related optical signal (EROS; a measure of changes in optical scattering due to neuronal activity) we can characterize rapidly evolving network processes by examining the millisecond-scale temporal correlation of activity in distinct regions during the …
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Non-invasive assessment of bacterial biofilm in the middle ear using low-coherence interferometry/optical coherence tomography and acoustic measurements
… two methods, low coherence interferometry (LCI)/optical coherent tomography (OCT) and acoustic measurements. Portable systems were constructed by integrating LCI/OCT techniques with a standard video otoscope to provide depth-resolved optical scattering properties of the middle ear. An automatic …
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High quality integrated LiNbO3 acousto-optic platform for visible light spectrum
… devices such as efficient microwave converters, optical isolators, and wavelength scale acousto-optic frequency shifters, which were not realizable before. However, all of these devices target the 1550 nm optical wavelength or mid IR spectrum, and there is no integrated acousto-optic platform for …
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Nanoscale magnetic resonance imaging using silicon nanowire oscillators
… the nanowires have widths much smaller than optical wavelengths, interferometry enables sensitive displacement detection because the nanowires exhibit enhanced optical scattering when the incident polarization is parallel to the nanowire axis. Interferometry also allows us to implement active …
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Characterizing optical properties in fibrous tissues
Optical methods are promising for non-invasive tissue characterization. Biological tissues can be classified into isotropic tissues and anisotropic tissues. The optical properties of isotropic tissues such as adipose tissue are independent of measurement direction. However, optical properties of …
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⁸⁷Rubidium Bose-Einstein condensates : machine construction and quantum Zeno experiments
… and is then captured and cooled in a magneto-optical trap. The atoms are then transfered into a cloverleaf style Ioffe-Pritchard magnetic trap and cooled to quantum degeneracy with radio frequency induced forced evaporation. Condensates containing up to 20 million atoms can be produced every …
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Devitrification Kinetics and Optical Stability of Optical Fibers at High Temperatures
Reliable sensing and monitoring systems based on optical fibers operating at high temperatures and in harsh environments are of high demand. One of the limitations of such systems is the devitrification of the fused silica based core and cladding glass at elevated temperatures. Crystallites can …
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Computational optical coherence tomography for polarization-sensitive imaging, aberration correction, and wavefront measurement
… this thesis, multiple longstanding challenges in optical imaging are solved by the development of new computational imaging methods, where computational imaging does not simply refer to simulation or modeling, but to the entirety of an imaging technology in which significant computation is …
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Imaging through scattering
… thesis we demonstrate novel methods to overcome optical scattering in order to resolve information about hidden scenes, in particular for biomedical applications. Imaging through scattering media has long been a challenge, as scattering corrupts scenes in a non-invertible way. The use of …
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Photoacoustic Reporter Gene Imaging And Optical Coherence Computed Tomography
… research. Compared with other modalities, optical imaging possesses several prominent merits. Because light interacts with tissue at the microscopic level through many distinct physical mechanisms, optical methods allow sensitive exploration of various aspects of the life down to the …
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