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High sensitivity fiber-coupled magnetometry using an ensemble of nitrogen-vacancy centers in diamond
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Patel, Rajesh L. (2022) High sensitivity fiber-coupled magnetometry using an ensemble of nitrogen-vacancy centers in diamond. PhD thesis, University of Warwick.
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WRAP_Theses_Patel_2022.pdf - Submitted Version - Requires a PDF viewer. Download (22Mb) | Preview |
Official URL: http://webcat.warwick.ac.uk/record=b3856550
Abstract
The utilization of solid-state defects for application in quantum and quantumassisted technologies has grown in recent years with focus on the nitrogen-vacancy center in diamond for the detection of magnetic fields with superior spatial resolution than any other magnetic field sensor technology. In this work a fiber-coupled magnetometer that is completely portable and can reach sub-nanotesla sensitivities was developed and characterized. For industrial application, a method was developed to detect damage in steel; this method was to measure the magnetic flux distortion of magnetic flux inserted into the ferromagnetic material under inspection allowing damage profiles to be mapped out. The other method which was investigated was the alternating field current method which was used to investigate damage in conductive materials. In both cases the fiber-coupled magnetometer was able to image damage in steel and differentiate the depth and width of the damage profiles. For medical applications, work was undertaken towards the development of a gradiometer to be able to perform unshielded magnetocardiography (MCG) measurements. Signal processing techniques were also investigated to be able to help improve the signal-to-noise of any MCG signals. For convenience an electrocardiography signal, whose morphology is similar to an MCG signal was used.
Item Type: | Thesis (PhD) | ||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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Library of Congress Subject Headings (LCSH): | Diamonds, Point defects, Magnetic fields -- Measurement, Magnetic flux, Steel -- Defects, Magnetometers, Electrocardiography | ||||
Official Date: | January 2022 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Department of Physics | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Morley, Gavin | ||||
Format of File: | |||||
Extent: | xx, 113, 31 leaves : illustrations | ||||
Language: | eng |
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