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 122 for “"Magnetometry"”.
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Nanophotonic Optomechanical Devices for Torque Magnetometry
Torque magnetometry is a powerful and sensitive method for studying intricate mesoscopic magnetic events inside magnetic materials using nanomechanical resonators. Over the years, the field of cavity optomechanics has demonstrated ever increasing sensitivity, with measurements limited by the …
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Digital Twin Modeling for NV Magnetometry
… framework for nitrogen-vacancy (NV) center-based magnetometry, advancing the field of quantum sensing. A surrogate model serves as a computational representation of the physical NV magnetometer system, enabling comprehensive exploration of parameter spaces to optimize device design. Leveraging …
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Pushing the Limits: Testing, Magnetometry and Ontario Lithic Scatters
… early in a scatter’s investigation, particularly magnetometry, have the ability to facilitate the extraction of more pertinent data about past peoples and their activities from such sites. Archaeological work was carried out at two sites near Kitchener, Ontario, in order to evaluate whether …
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Magnetic Characterisation of Nanostructured Magnetic Systems Using SQUID Magnetometry
In this thesis SQUID magnetometry was employed as the main characterisation tool to investigate the magnetic behaviour of a number of materials on the bulk, nano- and atomic scale. In particular magnetic characterization was conducted on a selection of doped lanthanum manganate (LMO)magnetic …
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Development and Evaluation of Unmanned Aerial Vehicle (UAV) Magnetometry Systems
… to determine the feasibility of using UAV-based magnetometry for chromite exploration. Observations were taken at two different elevations in order to generate a 3-D model of the magnetic field. Later, after applying upward continuation filters and comparing the calculated results to the real …
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Custom built atomic force microscope for nitrogen-vacancy diamond magnetometry
The nitrogen-vacancy (N-V) center in diamonds have the potential to be an ultra-sensitive magnetic field sensor that is capable of detecting single spins. Implementing this sensor for general and nontransparent samples is not trivial. For N-V centers to be a useful probe, a way of positioning the …
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Magnetometry with ensembles of nitrogen vacancy centers in bulk diamond
This thesis summarizes experiments conducted to develop a high sensitivity vector magnetometer using nitrogen vacancy (NV) centers in a bulk diamond sample. This project began by analyzing the sensitivity of a single NV orientation using a continuous wave electron spin resonance approach. A …
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High-Sensitivity Nitrogen-Vacancy Center Magnetometry: from DC to GHz
… understanding and improvement in NV-ensemble magnetometry, opening up new application spaces in several frequency bands of interest.
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Precision magnetometry and imaging via quantum manipulation of spins in diamond
… applied to NV spins. Third, the geometric phase magnetometry experiment employs single-NV control using a Berry sequence, consisting of off-resonant microwaves whose parameters vary along a cyclic path, thereby realizing 100 times larger magnetic field dynamic-range compared to the typical …
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Optimizing chemical-vapor-deposition diamond for nitrogen-vacancy center ensemble magnetometry
… of optical and spin properties. NV diamond magnetometry has enabled a wide array of applications from the noninvasive measurement of a single neuron action potential to the mapping [mu]T-fields in [mu]m-size meteorite grains. To further improve the magnetic sensitivity of an ensemble NV …
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Magnetocardiography in unshielded environment based on optical magnetometry and adaptive noise cancellation
This thesis proposes and demonstrates the concept of a magnetocardiographic system 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 …
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Vector magnetometry using cavity-enhanced microwave readout of solid-state spin sensors
… fluorescence readout. Applying this technique to magnetometry, I first build a proof-of-concept magnetometer with the capability of measuring magnetic fields along a single vector axis, with a sensitivity better than the optical shot noise limit of the system. I then expand on the initial …
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Assessing Quantum Magnetometry as an EmergingDetection Modality for Strategic Anti-Submarine Warfare
… such emerging 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 …
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All-optical method of nanoscale magnetometry for ensembles of nitrogen-vacancy defects in diamond
… considerable promise in the field of small scale magnetometry due to its high localization and retention of favorable optical properties at ambient conditions. Current methods of magnetometry with the NV center achieve high sensitivity to fields aligned with the defect axis; however, with most …
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Nanoscale magnetometry with a microcontroller-based magnetometer using a single nitrogen-vacancy defect in nanodiamond
… of diverse application areas such as nanomagnetometry, quantum information processing and nanobiothermometry, as well as for the development of new applications in the spintronic area and quantum technology. The NV− defect is a solid-state system that presents extraordinary sensitivity to …
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Model-based spectral inference in noisy physical time series: applications in laser linewidth estimation and precision magnetometry
… semiconductor lasers and spin-precession-based magnetometry – pose inverse problems that traditional methods struggle with due to low signal-to- noise ratios, nonstationary dynamics, and convolutional measurement effects. Spectral estimation is crucial in precision metrology, laser diagnostics, …
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Uncalibrated, absolute property estimation and measurement optimization for conducting and magnetic media using imposed [omega]-k magnetometry
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1991.
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