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Imaging damage in steel using a diamond magnetometer
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Zhou, L. Q., Patel, R. L., Frangeskou, Angelo, Nikitin, A., Green, Ben L., Breeze, Ben, Onoda, S., Isoya, J. and Morley, Gavin (2021) Imaging damage in steel using a diamond magnetometer. Physical Review Applied, 15 (2). 024015. doi:10.1103/PhysRevApplied.15.024015 ISSN 2331-7019.
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Official URL: https://doi.org/10.1103/PhysRevApplied.15.024015
Abstract
We demonstrate a simple, robust, and contactless method for nondestructive testing of magnetic materials such as steel. This uses a fiber-coupled magnetic sensor based on nitrogen-vacancy centers (NVCs) in diamond without magnetic shielding. Previous NVC magnetometry has sought a homogeneous bias magnetic field on the diamond to improve the sensitivity. In contrast, here we show that the spatial resolution for imaging is improved by applying an inhomogeneous magnetic field to the steel even though this leads to an inhomogeneous magnetic field on the diamond. Structural damage in the steel distorts the inhomogeneous magnetic field and by detecting this distortion we reconstruct the damage profile through quantifying the shifts in the NVC Zeeman splitting. With a 1-mm magnet as the source of our inhomogeneous magnetic field, we achieve a high spatial resolution of 1 mm in the plane parallel and 0.1 mm in the direction perpendicular to the surface of the steel. This works even when the steel is covered by a nonmagnetic material. The lift-off distance of our sensor head from the surface of 316 stainless steel is up to 3 mm.
| Item Type: | Journal Article | ||||||||||||||||||
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| Subjects: | Q Science > QC Physics | ||||||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering Faculty of Science, Engineering and Medicine > Science > Physics |
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| Library of Congress Subject Headings (LCSH): | Steel -- Magnetic properties , Magnetic fields -- Measurement, Magnetic resonance , Diamonds -- Nondestructive testing | ||||||||||||||||||
| Journal or Publication Title: | Physical Review Applied | ||||||||||||||||||
| Publisher: | American Physical Society | ||||||||||||||||||
| ISSN: | 2331-7019 | ||||||||||||||||||
| Official Date: | 5 February 2021 | ||||||||||||||||||
| Dates: |
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| Volume: | 15 | ||||||||||||||||||
| Number: | 2 | ||||||||||||||||||
| Article Number: | 024015 | ||||||||||||||||||
| DOI: | 10.1103/PhysRevApplied.15.024015 | ||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||
| Copyright Holders: | The authors | ||||||||||||||||||
| Date of first compliant deposit: | 2 March 2021 | ||||||||||||||||||
| Date of first compliant Open Access: | 2 March 2021 | ||||||||||||||||||
| RIOXX Funder/Project Grant: |
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