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 25 for “"Magnetic sensors"”.
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Calibration and Characterization of Cubesat Magnetic Sensors Using a Helmholtz Cage
… a Helmholtz cage to simulate any desired orbital magnetic field that would be experienced by a spacecraft around Earth, as well as investigation of magnetic interference as a result of on-board electrical activity.</p>
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Chameleon Interference: Assessing Vulnerability of Magnetic Sensors to Spoofing and Signal injection attacks through Environmental interference in Mobile Devices
Embedded sensors are a fixture of most devices in the current computer industry. These small devices are used for a variety of purposes throughout many fields to collect whatever kind of information is needed by the user. From data on device acceleration to data on position relative to the Earth's …
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Mechanical stress and stress compensation in Hall sensors
Silicon magnetic sensors based on the Hall effect have proven to be an excellent sensor choice for many applications, such as position sensing, gear-tooth sensing, contact-less switching and linear sensing. Although a sensor can be trimmed over temperature before it is shipped to the customer, …
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Magnetic Cleanliness, Sensing, and Calibration for CubeSats
… enabled the creation of accurate maps of Earth’s magnetic fields. However, these models have limited spatial and temporal resolution, and therefore are much less accurate in locations with fast or localized magnetic perturbations. Such perturbations can be particularly problematic near Earth’s …
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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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Magnetic Field Sensing via Multi-Material Acoustic Sensing Optical Fibers with Magnetostrictive Cladding Inclusions
In this conducted research, optical fiber sensors are used to measure low strength alternating magnetic fields. Various fiber sensor configurations are tested and investigated to demonstrate sensing capabilities at different field magnitudes and frequencies. Distributed acoustic sensing fibers …
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Development of innovative transducers based on Magnetic Fluids
… many different application fields. Among these, magnetic materials have gained great relevance thanks to the possibility of controlling many of their features via external magnetic fields but also to the fact that their presence, position or space distribution, is easily detectable by using …
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Equilibrium and stability studies of plasmas confined in a dipole magnetic field using magnetic measurements
… current ring to confine a plasma in a dipole magnetic field. Unlike most other confinement devices, plasma compressibility stabilizes and allows the plasma to attain a peak beta on the order of unity. Various magnetic sensors have been designed, calibrated, installed, and operated to …
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ArmTrak: tracking arm postures with a smartwatch
… - both wrist and elbow - using the motion and magnetic sensors on smartwatches. We do not intend to employ machine learning to train the system on a specific set of gestures. Instead, we aim to trace the geometric motion of the arm, which can then be used as a generic platform for gesture-based …
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Development and Evaluation of Unmanned Aerial Vehicle (UAV) Magnetometry Systems
In this thesis, the procedure of conducting magnetic surveys from a UAV platform is investigated. In the process of evaluating UAVs for such surveys, magnetic sensors capable of operating on a UAV platform were tested using a terrestrial survey, as well as on a UAV-platform. Results were then …
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Manipulation of magnetic anisotropy in nanostructures
Of late, the magnetic properties of micro/nano-structures have attracted intense research interest both fundamentally and technologically particularly to address the question that how the manipulation in the different layers of nanostructures, geometry of a patterned structure can affect the …
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High-Resolution MHD Spectroscopy of External Kinks in a Tokamak Plasma
… Pulse (HBT-EP) device using a new array of magnetic diagnostics and coils. The capabilities of the HBT-EP experiment are significantly extended with the installation of a new adjustable conducting wall, high-power modular control coil arrays, and an extensive set of 216 magnetic sensors that …
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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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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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Development of a magnetic targeting device applied to interlocking of distal intramedullary nail screw holes
… has been developed. This prototype device uses magnetic sensors to locate a permanent magnet placed at a know distance from the IMN interlocking hole. A drill sleeve may be attached to the targeting sensors so that when they are aligned with the target magnet, the drill sleeve is aligned with …
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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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Magnetoelectric Thin Film Heterostructures and Electric Field Manipulation of Magnetization
The coupling of magnetic and electric order parameters, i.e., the magnetoelectric effect, has been widely studied for its intriguing physical principles and potentially broad industrial applications. The important interactions between ferroic orderings -- ferromagnetism, ferroelectricity and …
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Giant Magnetoresistance in Magnetic Multilayers Using a New Embossed Surface
… advantages for the technology sector of magnetic sensing.
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On-chip magnetic sensor and readout design for 3D position tracking in image-guided interventions
Electromagnetic tracking (EMT) technology is integral to complex medical procedures, providing precise real-time tracking of surgical instruments while reducing dependence on radiation-based imaging. EMT is particularly beneficial in various image-guided interventions, enhancing accuracy and …
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A micromachined magnetic field sensor for low power electronic compass applications
A micromachined magnetic field sensing system capable of measuring the direction of the Earths magnetic field has been fabricated, measured, and characterized. The system is composed of a micromachined silicon resonator combined with a permanent magnet, excitation and sensing coils, and a magnetic …
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