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 65 for “"Optical Sensing"”.
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Responsive polymers for optical sensing applications
… signal. Based on this idea, this thesis presents sensing schemes which transduce the stimuli-induced variations in the solubility of polymer chains with covalently-bound fluorophores into a well-detectable fluorescence output. Benefiting from the principles of different photophysical phenomena, …
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Chip Scale Integrated Optical Sensing Systems with Digital Microfluidic Systems
… and the environment. Miniaturized and portable sensing systems are especially important for medical and environmental diagnostics and monitoring applications. Chip scale integrated planar photonic sensing systems that can combine optical, electrical and fluidic functions are especially …
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Versatile and Sensitive Optical Sensing and Imaging with Spectral Interferometry
Optical interferometry treats light as a wave. Light has not only brightness information, but also phase information, representing the number of cycles traveled, like hands on a clock. This phase information describes how far a beam of light travels in one path relative to another. Splitting light …
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Optical sensing as a means of monitoring health of multicomputer networks
The use of optical sensors to perform health monitoring in fault-tolerant multicomputers can allow the multicomputer to detect imminent failure in a particular section of the interconnection network due to damaging strain. This detection method allows the rerouting of critical data before data link …
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Tunable and High Refractive Index Polydimethylsiloxane Polymers for Label-Free Optical Sensing
… partial selectivity, coupled with label-free optical detection methods based on refractive index, can overcome the limitations of conventional VOC detection methods. A variety of tunable and high refractive index PDMS materials were developed by incorporating a range of titanium and zirconium …
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Designing Plasmonic Materials And Optical Metasurfaces For Light Manipulation And Optical Sensing
… are artificial materials designed to create optical properties that do not exist in nature. They are assemblies of subwavelength structures that are tailored in size, shape, composition, and orientation to realize the desired property. Metamaterials are promising for applications in diverse …
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Compact Optical Sensing Systems for pH and Other Substances Detection - Theory and Implementation
… is of importance in research and industry. Optical sensors based on contact imaging realize the chemical detection in compact, efficient and inexpensive ways. In the first project real-time optical pH sensor based on complementary metal–oxide–semiconductor (CMOS) contact imaging and …
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Closed loop control of full penetration welds using optical sensing of backbead width
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982.
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Development of Conjugated Boronate Ester-Linked Materials For Optical Sensing Applications Targeting Small Molecules
… ester-linked materials were delveloped for optical sensing applications, targeting small analytes. Backgrounds and significants for conjugated boron containing materials and their applications in molecular sensing were introduced in chapter 1. The development of cross-reactive sensors and …
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Development of novel optical sensing-based digital stethoscopes and deep learning-based heart sound denoising algorithms
… describes the design and evaluation of novel optical sensing-based digital stethoscopes and deep learning-based heart sound denoising algorithms. Cardiac auscultation is the act of listening non-invasively to the sounds of the heart. It provides insights into the mechanical activity of the …
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Investigating the plasmonic behaviour of gold nanostructured arrays with finite element method modelling for optical sensing applications
… surface plasmons (LSPs) exhibit striking optical behaviour with resonant properties tuned by modification of the host nanostructure’s geometry. This work utilises a novel, plasmonic gold nanorod array surface as a sensing platform for diagnostic applications. Biological species were …
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Magnetic densimeters: design and operation
… of two magnetic densimeters, one using a r.f. sensing system and one using an optical sensing system. Both systems have the same control system. Based on a series of experiments, it appears that the optical sensing densimeter is much easier to handle than the one using r.f. sensing. This is …
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Control of Radiative Heat and Momentum Transfer by Nanophotonic Engineering
… engineering applications including optical sensing, photovoltaics, and object manipulations. The radiative energy and momentum transfer between objects can be controlled by engineering electromagnetic states in the objects and in their environment. Although this can be achieved by …
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Experiments in Graphene and Plasmonics
Graphene nanoribbons, graphene based optical sensors, and grating based plasmonics are explored experimentally. Graphene nanoribbons exhibit highly insulating states that may allow for graphene based digital applications. We investigate the sensitivity of these states to local charged impurities in …
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Optical system for high-speed Atomic Force Microscope
… thesis presents the design and development of an optical cantilever deflection sensor for a high speed Atomic Force Microscope (AFM). This optical sensing system is able to track a small cantilever while the X-Y scanner moves in the X-Y plane at 1KHz over a large range of 50x50 microns. To achieve …
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Fibre Bragg grating temperature sensors for high-speed machining applications
… thesis presents a number of novel and existing optical sensing devices that overcome this limitation and also, in some cases, offer greater performance. The optical sensors are fibre Bragg grating based and the optical techniques used to interrogate that sensor include DWDM, WDM, athermic …
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Wireless Dust Sensor Network for a Feedlot Dust Abatement Study
… was developed using a low-cost, commercial optical sensing module. A second dust sensor was developed that samples air by the method of impaction of a dust-air stream into a water droplet capturing images using a low-cost USB microscope. The Box Model was used to calculate the emissions from …
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Optical pyrometry for noncontact temperature measurement
… infrared (IR) transmitting rod and IR lenses to optically measure the temperature of a molten particle as it falls in an evacuated drop tube, has been designed and tested in the laboratory and in the field. The design uses a calcium fluoride (CaF₂) rod which transports optical energy radiated …
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Direct and inverse design of microstructured optical fibres
Microstructured optical fibres, where an arrangement of air holes running longitudinally along the fibre guides light in either a solid or a hollow core, have created new opportunities in diverse areas of science and technology. Applications range from the generation of supercontinuum light to …
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