Bevington, P.; Gartman, R.; Chalupczak, W. (2019) Imaging of material defects with a radio-frequency atomic magnetometer. Review of Scientific Instruments, 90 (1). 013103 ISSN 0034-6748

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Abstract

Non-destructive eddy current testing of defects in metal plates using the magnetic resonance signal of a radio-frequency atomic magnetometer is discussed. The shape and amplitude of the spatial profile of signal features that correspond to defects are explored. System robustness is validated by comparing numerical and experimental results on a benchmark series of aluminium plates. In particular, it is demonstrated that the observed images represent the spatial distribution of the secondary field created by eddy currents in the sample. It is verified that the amplitude and phase contrast of the observed profiles can be used as a measure of the defect depth.

Item Type:	Article
Keywords:	non-destructive testing, radio-frequency atomic magnetometer
Subjects:	Quantum Phenomena > Nanophysics
Divisions:	Quantum Science
Identification number/DOI:	10.1063/1.5053959
Last Modified:	23 Apr 2019 12:31
URI:	https://eprintspublications.npl.co.uk/id/eprint/8351