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A 4He vector zero-field optically pumped magnetometer operated in the Earth-field

Abstract : Low intrinsic noise, high bandwidth and high accuracy vector magnetometers are key components for many ground or space geophysical applications. Here we report the design and the test of a 4He vector optically pumped magnetometer specifically dedicated to these needs. It is based on a parametric resonance magnetometer architecture operated in the Earth magnetic field with closed-loop compensation of the 3 components of the magnetic field. It provides offset-free vector measurements in a ±70 µT range with a DC to 1 kHz bandwidth. We demonstrate a vector sensitivity up to 130 fT/sqrt(Hz), which is about ten times better than the best available fluxgate magnetometers currently available for the same targeted applications.
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https://hal-cea.archives-ouvertes.fr/cea-03389609
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Submitted on : Thursday, October 21, 2021 - 10:00:10 AM
Last modification on : Saturday, October 30, 2021 - 3:31:49 AM

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François Bertrand, Thomas Jager, Axel Boness, William Fourcault, Gwenael Le Gal, et al.. A 4He vector zero-field optically pumped magnetometer operated in the Earth-field. Review of Scientific Instruments, American Institute of Physics, 2021, Volume 92, Issue 10, October 2021, pp.105005. ⟨10.1063/5.0062791⟩. ⟨cea-03389609⟩

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