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Unshielded portable optically pumped magnetometer for the remote detection of conductive objects using eddy current measurements

Rushton, Lucas M.; Pyragius, T.; Meraki, A.; Elson, L.; Jensen, K.

Unshielded portable optically pumped magnetometer for the remote detection of conductive objects using eddy current measurements Thumbnail


Authors

Lucas M. Rushton

T. Pyragius

A. Meraki

L. Elson

K. Jensen



Abstract

Electrically conductive objects can be detected using the principle of electromagnetic induction, where a primary oscillating magnetic field induces eddy currents in the object, which in turn produce a secondary magnetic field that can be measured with a magnetometer. We have developed a portable radio-frequency optically pumped magnetometer (RF OPM) working in unshielded conditions with sub-pT/√Hz magnetic field sensitivity when used for the detection of small oscillating magnetic fields, setting a new benchmark for the sensitivity of a portable RF OPM in unshielded conditions. Using this OPM, we have detected the induced magnetic field from aluminum disks with diameters as small as 1.5 cm and with the disks being ∼25 cm from both the excitation coil and the magnetometer. When used for eddy current detection, our magnetometer achieves a sensitivity of a 2-6 pT/√Hz. We have also detected a moving aluminum disk using our RF OPM and analyzed the magnetometer signals, which depend on the position of the disk, illustrating the potential of high sensitivity RF OPMs for remote sensing applications.

Journal Article Type Article
Acceptance Date Nov 6, 2022
Online Publication Date Dec 2, 2022
Publication Date Dec 2, 2022
Deposit Date Dec 2, 2022
Publicly Available Date Dec 2, 2022
Journal Review of Scientific Instruments
Print ISSN 0034-6748
Electronic ISSN 1089-7623
Publisher AIP Publishing
Peer Reviewed Peer Reviewed
Volume 93
Issue 12
Article Number 125103
DOI https://doi.org/10.1063/5.0102402
Keywords Instrumentation
Public URL https://nottingham-repository.worktribe.com/output/14319682
Publisher URL https://aip.scitation.org/doi/10.1063/5.0102402
Additional Information Received: 2022-06-14; Accepted: 2022-11-06; Published: 2022-12-02

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