A triaxial vectorization technique for a single-beam zero-field atomic magnetometer to suppress cross-axis projection error
Zero-field optically pumped magnetometers (OPMs) have emerged as an important technology for biomagnetism due to their ulta-sensitive performance, contained within a non-cryogenic small-scale sensor-head. The compactness of such OPMs is often achieved through simplified detection schemes, which typi...
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Main Authors | , , , , , , |
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Format | Journal Article |
Language | English |
Published |
23.08.2024
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Subjects | |
Online Access | Get full text |
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Summary: | Zero-field optically pumped magnetometers (OPMs) have emerged as an important
technology for biomagnetism due to their ulta-sensitive performance, contained
within a non-cryogenic small-scale sensor-head. The compactness of such OPMs is
often achieved through simplified detection schemes, which typically provide
only single-axis magnetic field information. However, multi-axis static
magnetic fields on non-measurement axes cause a systematic error that manifests
as amplitude and phase errors across the measurement axis. Here we present a
triaxial operational technique for a compact zero-field OPM which suppresses
multi-axis systematic errors through simultaneous measurement and closed-loop
active control of the static magnetic fields across all axes. The demonstrated
technique requires magnetic modulation across two axes while providing static
field information for all three axes. We demonstrate this technique on a
rubidium laboratory-based zero-field magnetometer, achieving a bandwidth of 380
Hz with sensitivities of $<25$ fT/$\sqrt{\rm{Hz}}$ across both transverse axes
and $65$ fT/$\sqrt{\rm{Hz}}$ along the beam axis. Using the proposed triaxial
technique, we demonstrate precise tracking of a 2 Hz triaxial vector test
signal and suppression of systematic cross-axis projection errors over an
extended period, $\simeq20$~min. |
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DOI: | 10.48550/arxiv.2408.12994 |