Detection of low-conductivity objects using eddy current measurements with an optical magnetometer
| Autor: | Mikhail Balabas, Hans Stærkind, Kasper Jensen, Michael Zugenmaier, Eugene S. Polzik, Jens Arnbak |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
genetic structures Atomic Physics (physics.atom-ph) Magnetometer Physics::Medical Physics FOS: Physical sciences Applied Physics (physics.app-ph) 02 engineering and technology Conductivity 01 natural sciences Physics - Atomic Physics law.invention law Electrical resistivity and conductivity 0103 physical sciences Eddy current Physics::Atomic Physics 010306 general physics business.industry Physics - Applied Physics Biological tissue equipment and supplies 021001 nanoscience & nanotechnology Characterization (materials science) Optoelectronics 0210 nano-technology business |
| Zdroj: | Physical Review Research Jensen, K, Zugenmaier, M, Arnbak, J, Stærkind, H, Balabas, M V & Polzik, E S 2019, ' Detection of low-conductivity objects using eddy current measurements with an optical magnetometer ', Physical Review Research, vol. 1, no. 3, 033087 . https://doi.org/10.1103/PhysRevResearch.1.033087 |
| ISSN: | 2643-1564 |
| Popis: | 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. Main article with supplemental material |
| Databáze: | OpenAIRE |
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