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

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-cance...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2019-05
Main Authors: Jensen, Kasper, Zugenmaier, Michael, Arnbak, Jens, Stærkind, Hans, Balabas, Mikhail V, Polzik, Eugene S
Format: Article
Language:English
Subjects:
Cesium
Containers
Eddy currents
Heart diseases
Magnetometers
Object recognition
Saline water
Tissues
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1905.01661