期刊
JOURNAL OF APPLIED PHYSICS
卷 125, 期 9, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5083039
关键词
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资金
- Engineering and Physical Sciences Research Council (EPSRC) [EP/P51066X/1]
- EPSRC [1775391] Funding Source: UKRI
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.
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