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Detection of low-conductivity objects using eddy current measurements with an optical magnetometer

2019-05-05
Kasper Jensen, Michael Zugenmaier, Jens Arnbak, Hans Stærkind, Mikhail V. Balabas, Eugene S. Polzik

Abstract

Detection and imaging of an electrically conductive object at a distance can be achieved by inducing eddy currents in it and measuring the associated magnetic field. We have detected low-conductivity objects with an optical magnetometer based on room-temperature cesium atomic vapor and a noise-canceling differential technique which increased the signal-to-noise ratio (SNR) by more than three orders of magnitude. We detected small containers with a few mL of salt-water with conductivity ranging from 4-24 S/m with a good SNR. This demonstrates that our optical magnetometer should be capable of detecting objects with conductivity < 1 S/m with a SNR > 1 and opens up new avenues for using optical magnetometers to image low-conductivity biological tissue including the human heart which would enable non-invasive diagnostics of heart diseases.

Abstract (translated by Google)
URL

https://arxiv.org/abs/1905.01661

PDF

https://arxiv.org/pdf/1905.01661


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