1-pT Noise Fluxgate Magnetometer for Geomagnetic Measurements and Unshielded Magnetocardiography
| Autor: | Mattia Butta, Coenrad J. Fourie, Michal Janosek, David Novotny, Elda Saunderson, Michal Dressler |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
business.industry Magnetometer 020208 electrical & electronic engineering 02 engineering and technology White noise law.invention Earth's magnetic field Optics Ferromagnetism Observatory law Magnetotellurics Electromagnetic shielding 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering business Instrumentation Magnetocardiography |
| Zdroj: | IEEE Transactions on Instrumentation and Measurement. 69:2552-2560 |
| ISSN: | 1557-9662 0018-9456 |
| DOI: | 10.1109/tim.2019.2949205 |
| Popis: | We present the development of a low-noise, fundamental-mode, orthogonal fluxgate magnetometer with four amorphous, annealed ferromagnetic wires. The 1-Hz noise obtained in the open and closed loop is as low as 0.75 and 1.5 pTrms/ $\surd $ Hz, respectively, with the white noise level about 0.6 pTrms/ $\surd $ Hz. This is to the best of our knowledge the lowest figure published for a fluxgate magnetometer so far. By using the annealed sensor cores, we also found the offset drift to decrease approximately six times to 2.5 nT/K. We compared the instrument performance to a low-noise observatory magnetometer when doing geomagnetic measurements and show that it is fully suitable for measurements at mHz frequencies, e.g., magnetotellurics. The magnetometer performance enables room-temperature, unshielded magnetocardiography. With a gradiometric arrangement of two sensors, we were able to perform an MCG measurement in ambient field, and even without averaging, the signal could be clearly resolved. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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