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 20 for “"magnetic field sensors"”.
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Magnetic Communication in Harsh Environments Employing High-Sensitive Wideband Magnetic Field Sensors
… to overcome these challenges is the use of magnetic fields for short- and medium-range data transmission, as they are less susceptible to the typical interference and attenuation that occur in dense or liquid media. This work presents an innovative solution for magnetic communication that …
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Characterization of the magnetoresistance of polypyrrole
… such as for use as motor windings or as magnetic field sensors, require a precise knowledge of the electrical properties of the polymers being used. This thesis presents a study of the magnetoresistance of the conducting polymer polypyrrole. It was found that the electrical resistance of …
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Fibre bragg gratings for microwave photonics and sensing
… and the building of fibre Bragg grating based magnetic-field sensors. Some theoretical background about fibre Bragg gratings, photosensitivity, fibre Bragg grating sensors and filters are presented. Fibre Bragg grating sensors in other industrial applications are highlighted. Some sensing …
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Integrating graphene Hall sensors with co-designed silicon circuits for high-throughput magnetic biosensing
… as graphene. For example, graphene Hall-effect sensors (GHSs) greatly outperform commercial silicon magnetic-field sensors and could significantly improve the performance of sensor arrays used in magnetic imagers and biosensing. However, the 2D nature of graphene leads to undesirable effects …
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Investigation of magnetic sensing system for in-place corrosion characterization in metals
… This document describes the development of magnetic sensing schemes to characterize corrosion of metals in situ. GMR magnetic field sensors are applied to overcome difficulties encountered with traditional corrosion detection methods. Magnetic measurements present a manner to monitor …
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A forearm controller and tactile display
… the orientation of the arm with accelerometers, magnetic field sensors, and gyroscopes, fusing the data with a quaternion based Unscented Kalman Filter. The orientation estimate is mapped to a virtual space that is perceived through a tactile display containing an array of vibrating motors. The …
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Functional Materials and Device Concepts for Magnetic Sensing, Gas Detection and Energy Harvesting
… three areas of materials science and physics: magnetic-field sensing, energy harvesting, and gas detection. Although examined separately, they are linked by their potential integration into self-sustaining sensor platforms for Internet of Things (IoT) applications, amid growing demand for …
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Assessing Quantum Magnetometry as an EmergingDetection Modality for Strategic Anti-Submarine Warfare
… technology is the idea of ‘quantum magnetometry’—magnetic field sensors which use quantum principles in order to obtain more precise measurements. Nuclear submarines can be detected by the magnetic distortions they cause in the background Earth magnetic field. Quantum magnetometers could enable …
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ELECTROCHEMICAL SYNTHESIS OF MAGNETIC MATERIALS FOR MAGNETIC RECORDING AND MEMS APPLICATIONS
With the increase in the areal density for magnetic recording disks, the bits are becoming smaller so that more bits can be accommodated in a given area of disk. However, there is a certain limit up to which the bits can be made smaller until it reaches the superparamagnetic limit, where bits …
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Multimode Structure of Resistive Wall Modes near the Ideal Wall Stability Limit
… dynamics in a tokamak using a high-resolution magnetic sensor set. Multimode effects are directly measured, rather than inferred from anomalies in single-mode behavior. In order to accomplish this, an extensive set of 216 poloidal and radial magnetic field sensors has been installed in the High …
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An HBT magnetic sensor with integrated 3-dimensional magnetic structures
… functionality. This thesis describes a work on magnetic field sensors based on an InP/InGaAs heterojunction bipolar transistor (HBT) which has been fabricated to be compatible with high frequency epilayer structure and processes. In this work, the complete fabrication process for the HBT …
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Probing Entanglement and Symmetry Breaking Orders via Spectroscopies and Machine Learning
… development of advanced technologies, including magnetic-field sensors, energy-related technologies, and quantum computers. Especially, the search of highly entangled quantum materials is crucial, because entanglement is a resource in quantum information applications. A key step towards finding …
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Nanostruktūrizuotų manganitų kobaltitų sluoksnių magnetovaržinės savybės /
… processes in these films after switching-off the magnetic field and the origin of phenomena determining these processes were studied. The influence of long term and accelerated aging of the films on their magnetoresistive properties were investigated. It has been found that cobalt doping of …
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Magnetoelectric Device and the Measurement Unit
Magnetic sensors are widely used in the field of mineral, navigational, automotive, medical, industrial, military, and consumer electronics. Many magnetic sensors have been developed that are generated by specific laws or phenomena: such as search-coil, fluxgate, Hall Effect, anisotropic …
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Remote measurement of ELF/VLF radio emissions by lightning and ground-based transmitters
<p>Electromagnetic waves in the very low frequency (VLF, 3-30 kHz) and extremely low frequency (ELF, 3-3000 Hz) bands propagate extremely well in the cavity between the earth and the ionosphere with low attenuation. Because of this, radio waves emitted in this frequency range can be measured at …
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Photonic Crystal Lorentz Force Magnetometer for Out-of-Plane Magnetic Field Sensing
… of highly sensitive and accurate microsensors is crucial for advancing modern sensing technologies with the goal of integrating increasingly complex circuits onto compact devices, such as smart phones and wearables. In this work, a Lorentz force magnetometer was designed based on the …
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A contactless and non-intrusive current measurement technique for low and medium voltage AC power systems
… using Tunneling magnetoresistive (TMR) sensors is proposed and implemented for AC power systems. The proposed sensors overcome the aforementioned drawbacks of the CTs and provide more accurate outputs for asymmetrical currents during fault conditions. A thorough investigation is carried …
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Lead - Free Piezoelectric Based Magnetoelectric Composites
… by non-zero remanent ME responses at zero magnetic bias field (Hbias). It was revealed that the self-biased ME effects can be observed in three-phase laminate composites consisting of piezoelectric material and two dissimilar magnetostrictive materials. On applying Hbias to the laminates in …
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Magnetoelectric Composites for On-Chip Near-Resonance Applications
… polarization (P) of a material under an applied magnetic field (H) or an induced magnetization (M) under an external electric field (E). ME materials have attracted number of investigators due to their potential for improving applications such as magnetic field sensors, filters, transformers, …
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Spin Polarized Transport in Nanoscale Devices
The ultimate goal in the rapidly burgeoning field of spintronics is to realize semiconductor-based devices that utilize the spin degree of freedom of a single charge carrier (electron or hole) or an ensemble of such carriers to achieve novel and/or enhanced device functionalities such as spin based …