Imaging damage in steel using a diamond magnetometer
| Autor: | L. Q. Zhou, Junichi Isoya, Shinobu Onoda, Ben Breeze, Angelo Frangeskou, A. Nikitin, Gavin W. Morley, R. L. Patel, Ben Green |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Physics::Instrumentation and Detectors Magnetometer FOS: Physical sciences General Physics and Astronomy Applied Physics (physics.app-ph) 02 engineering and technology engineering.material 01 natural sciences law.invention symbols.namesake Optics law Nondestructive testing 0103 physical sciences Perpendicular 010306 general physics QC Zeeman effect business.industry Diamond Physics - Applied Physics 021001 nanoscience & nanotechnology Magnetic field Magnet Electromagnetic shielding engineering symbols 0210 nano-technology business |
| ISSN: | 2331-7019 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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