Enhanced material defect imaging with a radio-frequency atomic magnetometer

Bevington, P. and Gartman, R. and Chalupczak, W. (2019) Enhanced material defect imaging with a radio-frequency atomic magnetometer. Journal of Applied Physics, 125 (9). 094503. ISSN 0021-8979 (https://doi.org/10.1063/1.5083039)

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Imaging of structural defects in a material can be realized with a radio-frequency atomic magnetometer by monitoring the material’s response to a radio-frequency excitation field. We demonstrate two measurement configurations that enable the increase of the amplitude and phase contrast in images that represent a structural defect in electrically conductive and magnetically permeable samples. Both concepts involve the elimination of the excitation field component, orthogonal to the sample surface, from the atomic magnetometer signal. The first method relies on the implementation of a set of coils that directly compensates the excitation field component in the magnetometer signal. The second takes advantage of the fact that the radio-frequency magnetometer is not sensitive to the magnetic field oscillating along one of its axes. Results from simple modelling confirm the experimental observation and are discussed in detail.