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 61 for “"magnetometers"”.
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RTD FLUXGATE MAGNETOMETERS
Fluxgate magnetometers have always been of interest to the technical and scientific communities as practical and convenient sensors for vector magnetic field measurements in the range of microtesla requiring a resolution of hundreds of picotesla at room temperature, and they find applicability in …
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Characterization of Laminated Magnetoelectric Vector Magnetometers to Assess Feasibility for Multi-Axis Gradiometer Configurations
… affordable to fabricate than competing vector magnetometers and with recent increases in sensitivity, have potential for use in arrays and gradiometer configurations. However, little is known about their total field detection, the effects of multiple sensors in close proximity and the signal …
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Effect of Interplanetary Shock Impact Angle on the Occurrence Rate and Properties of Pc5 Waves Observed by High-Latitude Ground Magnetometers
… impact angle, data from a series of Antarctic magnetometers was collected and compared to a database of known interplanetary shocks to determine when the response to different shocks was detected at the magnetometer. For this investigation, we were concerned with determining what impact if any, …
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Integration and characterization of a control and signal processing system for a SERF magnetometer array
Interest in the development of ultrasensitive magnetometers is driven by applications in a variety of areas, including magnetoencephalography (MEG), magnetic anomaly detection (MAD), dynamic measurements of geomagnetic fields, and MRI signal detection. While numerous architectures are being pursued …
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Quadrature-point stabilization of Mach-Zehnder interferometers
Optical fiber magnetometers are extremely sensitive devices which are capable of competing with magnetometers implemented using other technologies. Demodulation of the signals detected using these magnetometers can be performed using either homodyne or heterodyne techniques. Higher sensitivities …
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Calibration and Characterization of Cubesat Magnetic Sensors Using a Helmholtz Cage
… Poly satellite missions will depend heavily on magnetometers. In order to utilize magnetometers as a viable source of attitude knowledge, precise calibration is required to ensure the greatest accuracy achievable. This paper outlines a procedure for calibrating and testing magnetometers on the …
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The feasibility of the use of Overhauser effect in a nuclear free precession magnetometer.
Nuclear Free Precession Magnetometers have been in use since the first successful one was built in 1954. These magnetometers, used to measure the magnitude of the Earth's magnetic field, operate on the relationship that exists between the magnitude of the environmental magnetic field and the …
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Low Cost Magnetometer Calibration and Distributed Simultaneous Multipoint Ionospheric Measurements from a Sounding Rocket Platform
<p>Low-cost and low-size-weight-and-power (SWaP) magnetometers can provide greater accessibility for distributed simultaneous measurements in the ionosphere, either onboard sounding rockets or on CubeSats. The Space and Atmospheric Instrumentation Laboratory (SAIL) at Embry-Riddle Aeronautical …
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Assessing Quantum Magnetometry as an EmergingDetection Modality for Strategic Anti-Submarine Warfare
… in the background Earth magnetic field. Quantum magnetometers could enable more precise measurements of such distortions. However, the lack of certainty around the potential for this emerging technology has led to a lack of clarity in policy circles. This thesis explores some limits on the impact …
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Source distribution analysis of magnetic microscopy maps of geological samples
… devices (SQUID) are currently the most sensitive magnetometers for geological samples. Standard SQUID magnetometers are able to directly estimate the net moment of a sample, while SQUID microscopes require complex inversion of maps of the magnetic field above the sample. In order to extract …
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Mathematic approaches for the calibration of the CHAMP satellite magnetic field measurements
… magnetic field are undertaken by two Fluxgate Magnetometers (vector magnetometer) and one Overhauser Magnetometer (scalar magnetometer) flown on CHAMP. In order to ensure the quality of the data during the whole mission, the calibration of the magnetometers has to be performed routinely in …
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Novel Sensing Approaches towards Ultimate MEMS Sensors
… (MEMS and NEMS) accelerometers, magnetometers and vibration sensors utilizing various actuation and sensing mechanisms have been developed and demonstrated. These sensors are integral to various geographical, industrial, military, environmental and biomedical applications. …
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Deep penetration magnetoquasistatic sensors
… the design of families of circularly symmetric magnetometers and dielectrometers with the "model-based" methodology, which requires close agreement between actual sensor response and simulated response. These kinds of sensors are needed in applications where the components being tested have …
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Magnetocardiography in unshielded environment based on optical magnetometry and adaptive noise cancellation
… employing an array of optically-pumped quantum magnetometers and an adaptive noise cancellation for heart magnetic field measurement within a magnetically-unshielded environment. Optically-pumped quantum magnetometers are based on the use of the atomic-spin-dependent optical properties of an …
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Interactive Spin Dynamics in Magnon and Quantum Spin Systems
… and the restricted frequency range of NV-based magnetometers, which will be tackled in this thesis. We first leverage the chirality of interlayer magnetic dipolar interactions to introduce an easily implementable system—antiparallel aligned magnetic multilayers—for realizing topological magnonic …
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Magnetic Cleanliness, Sensing, and Calibration for CubeSats
Magnetometers are widely used on satellites for both attitude sensing and scientific observations. Spaceborne magnetometers have 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 …
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Data Driven Prediction Without a Model
… monitored by the network of ground-based magnetometers in the auroral region are used for forecasting at two stages. In the first stage, the auroral electrojet indices, computed from the magnetometer data, are used to reconstruct the dynamics and Nearest Neighbor ETKF yields forecasts of …
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Synoptic variability of a CIR-driven open-closed boundary during solar minimum
… using the PENGUIn AGOs network of ground-based magnetometers on the Antarctic continent, the synoptic behavior of the OCB during a CIR-driven magnetic storm has been studied. Observations were compared with results provided by the BATSRUS space weather model. It is shown that such synoptic …
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Electromagnetic Modelling of Superconducting Sensor Designs
… QUantum Interference Device (SQUID) magnetometers made of YBCO (YBa2Cu3O7-x) was considered. The inductances and effective areas were calculated using the software package 3D-MLSI. Resolution and reliability issues were first tested on simple superconducting systems, showing good …
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Objective real-time motion analysis using wearable devices for post stroke rehabilitation
… The system uses accelerometers, gyroscopes, and magnetometers to measure movement during three single-tasked clinical activities: the functional reach test, the NIHSS motor arm test, and the NIHSS motor leg test. The proposed system has been extensively tested using emulated and real data from …
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