| Autor: |
Janosek, Michal, Butta, Mattia, Dressler, Michal, Saunderson, Elda, Novotny, David, Fourie, Coenrad |
| Předmět: |
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| Zdroj: |
IEEE Transactions on Instrumentation & Measurement; May2020, Vol. 69 Issue 5, p2552-2560, 9p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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