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 29 for “"Phase measurement"”.
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A phase measurement radio positioning system for indoor use
I present here the detailed design for a low frequency radio navigation system called the Building Positioning System (BPS). This system is designed to work indoors, where the microwave radio signals of the Global Positioning System (OPS) cannot be received. Potential applications for this system …
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Optimising Signal Isolation and Phase Measurement in Digitally Enhanced Interferometry
… and homodyne versions of DI and differential phasemeter optimisation based on synthesised common mode noise suppression. In the first part, we address the limitations of the pseudo-random code known as the maximal length sequence (m-sequence). This code has been the most commonly used in DI …
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Optimising Signal Isolation and Phase Measurement in Digitally Enhanced Interferometry
… and homodyne versions of DI and differential phasemeter optimisation based on synthesised common mode noise suppression. In the first part, we address the limitations of the pseudo-random code known as the maximal length sequence (m-sequence). This code has been the most commonly used in DI …
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Spectral domain interferometry: A high-sensitivity, high-speed approach to quantitative phase imaging
… bright field microscopes. Therefore, the phase-based optical microscopy techniques play important roles in the development of the modern biomedical science. Furthermore, the ability to achieve quantitative phase measurement of the tiny structures of biomedical specimens is of great …
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Minimal PMU placement for graph observability: a decomposition approach
… that is, the placement of a minimal number of Phase Measurement Units (PMUs) on the nodes of a power system graph such that the entire graph is observed. The NP-completeness of PMU placement for planar bipartite graphs is shown. PMU placement algorithms are developed for graphs of bounded tree …
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Methods for enhancing carrier phase GNSS positioning and attitude determination performance.
… of using low cost, single frequency Carrier phase Differential Global Navigation Satellite System (CDGNSS) in real-time, safety or liability critical applications. This is done by improving the integer ambiguity resolution performance and carrier phase error modeling. CDGNSS is considered for …
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Smartphone precise positioning in urban environments using internal GNSS and IMU sensors
… and antennas, and along with frequent carrier-phase measurement discontinuities and losses, pose a challenge for advanced GNSS positioning techniques. In response to these challenges, this work is dedicated to addressing these smartphone positioning obstacles and aims to provide accurate, …
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8-Port Homodyne Detection of EIT-enhanced Cross-phase Modulation Using Broadband Signal Pulses
… processing. I have designed and implemented a phase-sensitive detection scheme for optical-frequency electromagnetic fields, which has been used to measure μrad phase shifts on nanosecond timescales. This phase measurement was developed for the express purpose of detecting cross-phase …
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Emission source microscopy for electromagnetic interference source localization
… used for antenna diagnostic and alignment of phase array antennas. Using a technique which is derived from the synthetic aperture radar we present emission source microscopy to localize the sources of active radiation on a PCB. After obtaining the location of sources, using near field to …
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One- and two-photon states for quantum information
… we make the first optical mixed-state geometric phase measurement via single-photon interferometry. Finally, we present experimental progress on the remote preparation of single-photon number states, created deterministically out of a non-deterministic spontaneous parametric downconversion source.
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The Remote Measurement of Phase Angle
… pair of substations should not be made until the phase angle between their voltages is small, There has been, for many years, a need for the measurement of this phase angle, with the results displayed in the distribution Control Room, A direct measurement may be significantly in error, due to the …
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A low cost tellurometer
… of a low-cost microwave electronic distance measurement instrument using the Tellurometer phase-measurement principle. In a simplified form the instrument can be configured as a full-duplex 9 600 Baud datalink. The Tellurometer was invented in 1957 by the late Dr. Trevor Wadley of the …
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Optical measurement of neural action potentials using low coherence heterodyne interferometry
… surface. To cancel the noise, a differential phase measurement was made between this heterodyne signal and a stable reference heterodyne. DBHI has a stability of 30 picometers over 100ms. We have used this interferometer to measure the expansion of the nerve surface during the action …
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A Study on High-Speed Magnetic Induction Tomography Instrumentation Aiming at Low Conductivity Applications
… data acquisition rate. Specifically the multiphase flow in oil pipes and the detection of the cardiac activity and the lung activity were targeted.A thorough investigation for the specifications, the design and the development of the required MIT instrumentation was performed. Two low cost MIT …
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Development of a digital signal processing measurement platform for biomedical magnetic induction tomography and spectroscopy
… detected by the sensors must be measured using a phase sensitive technique. A sub-millidegree phase stability is typically required for biological tissues, where the objects to be imaged have relatively low conductivity (< 2S/m). The phase noise and thermal related phase drift in the receiver's …
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Performance evaluation of a spread spectrum local area position location system
… error performance of a frequency hopping phase Ineasurenlent type position location system was determined using theoretical, simulation, and experimental means. The primary limitation to position accuracy was found to be propagation channel induced errors. By employing nonlinear filtering …
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Key receiver circuits for digital beamforming in millimeter-wave imaging
… we investigate key components for an active phased array imaging system operating at 77GHz that performs purely digital beamforming. Each element in the phased array has an antenna and processor that measures the phase and amplitude of the received signal. The focus of this thesis is the …
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Bidirectional mode-locked fiber ring laser
… constantly pushing the limits of improvement in measurement accuracy. With each passing year, government agencies and contract companies increase investment in research of high precision, ultra sensitive, instruments. Over the last decade, advancements in ultrashort time scale optics have moved …
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Design and Implementation of QCM Virtual Sensing Schemes for Analyses of Volatile Organic Compounds
… of ILs to 250 °C to encompass similar solid phase salts, were used to design the first examples of QCM based VSAs, and V-MSAs, for pure VOC and complex mixture analyses. Furthermore binary blends of organic salts and polymer were used to fabricate the first VSA with the capability to identify …
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Spatial light interference microscopy and applications
Phase contrast microscopy has revolutionized cell biology by rendering detailed images from within live cells without using exogenous contrast agents. However, the information about the optical thickness (or phase) is qualitatively mixed in the phase contrast intensity map. Quantifying optical …
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